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VII/233             The 2MASS Extended sources           (IPAC/UMass, 2003-2006)

The Two Micron All Sky Survey: Extended sources Skrutskie M.F., Cutri R.M., Stiening R., Weinberg M.D., Schneider S., Carpenter J.M., Beichman C., Capps R., Chester T., Elias J., Huchra J., Liebert J., Lonsdale C., Monet D.G., Price S., Seitzer P., Jarrett T., Kirkpatrick J.D., Gizis J.E., Howard E., Evans T., Fowler J., Fullmer L., Hurt R., Light R., Kopan E.L., Marsh K.A., McCallon H. L., Tam R., Van Dyk S., Wheelock S. <Astron. J. 131, 1163 (2006)> =2006AJ....131.1163S
ADC_Keywords: Galaxies, IR; Infrared sources ; Photometry, infrared ; Surveys Keywords: Catalogs - Infrared: General - Surveys Description: Between 1997 June and 2001 February the Two Micron All Sky Survey (2MASS) collected 25.4 Tbytes of raw imaging data covering 99.998% of the celestial sphere in the near-infrared J(1.25µm), H(1.65µm), and Ks(2.16µm) bandpasses. Observations were conducted from two dedicated 1.3 m diameter telescopes located at Mount Hopkins, Arizona, and Cerro Tololo, Chile. The 2MASS All-Sky Data Release includes the FITS images covering the entire sky, a Point Source Catalog (PSC) of 471 million sources (Cat. II/242), and the present Extended Source Catalog. The 2MASS Extended Source Catalog contains sources that are extended with respect to the instantaneous PSF, such as galaxies and Galactic nebulae. The algorithms used to create the 2MASX catalog are described by Jarett et al. (2000AJ....119.2498J), and in the 2MASS Explanatory Supplement (accessible from the 2MASS Home Page). Briefly, point/ extended-source discrimination was conducted for each band-merged point-source detection by comparing a variety of radial shape, surface brightness, image moments, and symmetry parameters with characteristic stellar parameters using an oblique decision tree classifier. The classification tests included filters to exclude double and triple stars, which were one of the main contaminants in high source density regions. Stellar parameters were measured empirically as a function of time in each scan to compensate for variations in the atmospheric seeing using the aggregate properties of band-merged point-source extractions. The catalog contains 389 columns described briefly in the "Byte-by-byte Description" section below; their description includes also the 2MASS database original column names used in the original descriptions. Acknowledging 2MASS in Publications: Please include the following standard acknowledgement in any published material that makes use of the 2MASS data products: "This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation." File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file xsc.dat 2194 1647599 *The 2MASS Extended Catalog (2MASX)
Note on xsc.dat: the file is split into smaller pieces of 50,000 objects each, named xsc.dat.00 to xsc.dat.32
See also: http://spider.ipac.caltech.edu/staff/jarrett/2mass/XSC/ : XSC Home Page http://www.ipac.caltech.edu/2mass/ : 2MASS Home Page II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: xsc.dat
Bytes Format Units Label Explanations
1- 13 F13.4 d JDobs ? Julian date of the observation (1) 15- 31 A17 --- 2MASX Source name (HHMMSSss+DDMMSSs, J2000) 33- 42 F10.6 deg RAdeg Right ascension (J2000), based on peak pixel 44- 53 F10.6 deg DEdeg Declination (J2000), based on peak pixel 55- 64 F10.6 deg supRAdeg ? Super-coadd centroid RA (J2000) (sup_ra) 66- 75 F10.6 deg supDEdeg ? Super-coadd centroid Dec (J2000) (sup_dec) 77- 83 F7.3 deg GLon Galactic longitude 85- 91 F7.3 deg GLat Galactic latitude 93- 97 F5.2 [---] dens ? Coadd log(density) of stars with k<14mag -------------------------------------------------------------------------------- 99-104 F6.1 arcsec r.K20e ? Semi-major axis of fiducial ellipse at isophote K=20mag/arcsec2 (r_k20fe) 106-111 F6.3 mag J.K20e ? J magnitude in K20e ellipse (jmk20fe) 113-117 F5.3 mag e_J.K20e ? σ(J.K20e) (jmsigk20fe) 119 I1 --- f_J.K20e ? Confusion flags of J.K20e (jflgk20fe) (2) 121-126 F6.3 mag H.K20e ? H magnitude in K20e ellipse (hmk20fe) 128-132 F5.3 mag e_H.K20e ? σ(H.K20e) (hmsigk20fe) 134 I1 --- f_H.K20e ? Confusion flags of H.K20e (hflgk20fe) (2) 136-141 F6.3 mag K.K20e ? K magnitude in K20e ellipse (kmk20fe) 143-147 F5.3 mag e_K.K20e ? σ(K.K20e) (kmsigk20fe) 149 I1 --- f_K.K20e ? Confusion flags of K.K20e (kflgk20fe) (2) -------------------------------------------------------------------------------- 151-155 F5.1 arcsec r3sig ? Semi-major axis of 3σ K isophotal ellipse (r_3sig) 157-161 F5.3 --- Jb/a ? J minor/major axis ratio to 3σ (j_ba) 163-165 I3 deg Jpa ? J pos.angle of 3σ ellipse (j_phi) 167-171 F5.3 --- Hb/a ? H minor/major axis ratio to 3σ (h_ba) 173-175 I3 deg Hpa ? H pos.angle to 3σ ellipse (h_phi) 177-181 F5.3 --- Kb/a ? K minor/major axis ratio to 3σ (k_ba) 183-185 I3 deg Kpa ? K pos.angle to 3σ ellipse (k_phi) 187-191 F5.1 arcsec rS3sig ? Semi-major axis of super-coadd 3σ isophotal ellipse (supr3sig) 193-197 F5.3 --- Sb/a ? Minor/major axis ratio to rS3sig (sup_ba) 199-201 I3 deg Spa ? Pos.angle of rS3sig (sup_phi) -------------------------------------------------------------------------------- 203-208 F6.1 arcsec r.fe ? K fiducial Kron elliptical aperture semi-major axis (r_fe) 210-215 F6.3 mag J.fe ? J magnitude in r.fe (jmfe) 217-221 F5.3 mag e_J.fe ? σ(J.fe) (jmsigfe) 223 I1 --- f_J.fe ? Confusion flags of J.fe (jflgfe) (2) 225-230 F6.3 mag H.fe ? H magnitude in r.fe (hmfe) 232-236 F5.3 mag e_H.fe ? σ(H.fe) (hmsigfe) 238 I1 --- f_H.fe ? Confusion flags of H.fe (hflgfe) (2) 240-245 F6.3 mag K.fe ? K magnitude in r.fe (kmfe) 247-251 F5.3 mag e_K.fe ? σ(K.fe) (kmsigfe) 253 I1 --- f_K.fe ? Confusion flags of K.fe (kflgfe) (2) -------------------------------------------------------------------------------- 255-261 F7.2 arcsec r.ext ? Extrapolation/total radius of fit to radial profile (r_ext) 263-268 F6.3 mag J.ext ? J magnitude in r.ext (jmext) 270-274 F5.3 mag e_J.ext ? σ(J.ext) (jmsigext) 276-281 F6.3 --- n_J.ext ? χ2(J.ext) (j_pchi) (3) 283-288 F6.3 mag H.ext ? J magnitude in r.ext (hmext) 290-294 F5.3 mag e_H.ext ? σ(H.ext) (hmsigext) 296-301 F6.3 --- n_H.ext ? χ2(H.ext) (h_pchi) (3) 303-308 F6.3 mag K.ext ? J magnitude in r.ext (kmext) 310-314 F5.3 mag e_K.ext ? σ(K.ext) (kmsigext) 316-321 F6.3 --- n_K.ext ? χ2(K.ext) (k_pchi) (3) -------------------------------------------------------------------------------- 323-328 F6.2 arcsec Jr.eff ? J half-light radius (jreff) 330-334 F5.2 mag/arcsec2 Jmu ? J mean surface brightness (jmnsurfbeff) 336-341 F6.2 arcsec Hr.eff ? H half-light radius (hreff) 343-347 F5.2 mag/arcsec2 Hmu ? H mean surface brightness (hmnsurfbeff) 349-354 F6.2 arcsec Kr.eff ? K half-light radius (kreff) 356-360 F5.2 mag/arcsec2 Kmu ? K mean surface brightness (kmnsurfbeff) 362-366 F5.2 --- Jconc ? J concentration index (jconindx) (3) 368-372 F5.2 --- Hconc ? H concentration index (hconindx) (3) 374-378 F5.2 --- Kconc ? K concentration index (kconindx) (3) 380-385 F6.2 mag/arcsec2 J.peak ? J peak pixel brightness (j_peak) 387-392 F6.2 mag/arcsec2 H.peak ? H peak pixel brightness (h_peak) 394-399 F6.2 mag/arcsec2 K.peak ? K peak pixel brightness (k_peak) 401-406 F6.2 mag/arcsec2 J.c5 ? J central surface brightness (r≤5") (j_5surf) 408-413 F6.2 mag/arcsec2 H.c5 ? H central surface brightness (r≤5") (h_5surf) 415-420 F6.2 mag/arcsec2 K.c5 ? K central surface brightness (r≤5") (k_5surf) -------------------------------------------------------------------------------- 422-426 F5.2 --- xScore [1,2]? extended score (e_score) (4) 428-432 F5.2 --- gScore [1,2]? galaxy score (g_score) (4) 434-435 I2 --- vc Visual verification of source (5) 437 A1 --- cc Contamination or confusion flag (cc_flg) (6) 439-442 I4 pix imNx ? Size of postage stamp image (im_nx) -------------------------------------------------------------------------------- 444-448 F5.1 arcsec r.K20c ? Radius of fiducial circle at isophote K=20mag/arcsec2 (r_k20fc) 450-455 F6.3 mag J.K20c ? J magnitude in r.K20c (jmk20fc) 457-461 F5.3 mag e_J.K20c ? σ(J.K20c) (jmsigk20fc) 463 I1 --- f_J.K20c ? Confusion flags of J.K20c (jflgk20fc) (2) 465-470 F6.3 mag H.K20c ? H magnitude in r.K20c (hmk20fc) 472-476 F5.3 mag e_H.K20c ? σ(H.K20c) (hmsigk20fc) 478 I1 --- f_H.K20c ? Confusion flags of H.K20c (hflgk20fc) (2) 480-485 F6.3 mag K.K20c ? K magnitude in r.K20c (kmk20fc) 487-491 F5.3 mag e_K.K20c ? σ(K.K20c) (kmsigk20fc) 493 I1 --- f_K.K20c ? Confusion flags of K.K20c (kflgk20fc) (2) -------------------------------------------------------------------------------- 495-499 F5.1 arcsec Jr.e ? J Kron ellipse semi-major axis (jre) 501-506 F6.3 mag J.e ? J magnitude in Jr.e (jme) 508-512 F5.3 mag e_J.e ? σ(J.e) (jmsige) 514 I1 --- f_J.e ? Confusion flags of J.e (jflge) (2) 516-520 F5.1 arcsec Hr.e ? H Kron ellipse semi-major axis (hre) 522-527 F6.3 mag H.e ? H magnitude in Hr.e (hme) 529-533 F5.3 mag e_H.e ? σ(H.e) (hmsige) 535 I1 --- f_H.e ? Confusion flags of J.e (hflge) (2) 537-541 F5.1 arcsec Kr.e ? K Kron ellipse semi-major axis (kre) 543-548 F6.3 mag K.e ? K magnitude in Kr.e (kme) 550-554 F5.3 mag e_K.e ? σ(K.e) (kmsige) 556 I1 --- f_K.e ? Confusion flags of K.e (kflge) (2) -------------------------------------------------------------------------------- 558-562 F5.1 arcsec Jr.c ? J Kron circular aperture radius (jrc) 564-569 F6.3 mag J.c ? J Kron circular aperture magnitude (jmc) 571-575 F5.3 mag e_J.c ? σ(J.c) (jmsigc) 577 I1 --- f_J.c ? Confusion flags of J.c (jflgc) (2) 579-583 F5.1 arcsec Hr.c ? H Kron circular aperture radius (hrc) 585-590 F6.3 mag H.c ? H Kron circular aperture magnitude (hmc) 592-596 F5.3 mag e_H.c ? σ(H.c) (hmsigc) 598 I1 --- f_H.c ? Confusion flags of H.c (hflgc) (2) 600-604 F5.1 arcsec Kr.c ? K Kron circular aperture radius (krc) 606-611 F6.3 mag K.c ? K Kron circular aperture magnitude (kmc) 613-617 F5.3 mag e_K.c ? σ(K.c) (kmsigc) 619 I1 --- f_K.c ? Confusion flags of K.c (kflgc) (2) -------------------------------------------------------------------------------- 621-625 F5.1 arcsec r.fc ? K fiducial Kron circular radius (r_fc) 627-632 F6.3 mag J.fc ? J magnitude in r.fc (jmfc) 634-638 F5.3 mag e_J.fc ? σ(J.fc) (jmsigfc) 640 I1 --- f_J.fc ? Confusion flags of J.fc (jflgfc) (2) 642-647 F6.3 mag H.fc ? H fiducial Kron circular magnitude (hmfc) 649-653 F5.3 mag e_H.fc ? σ(H.fc) (hmsigfc) 655 I1 --- f_H.fc ? Confusion flags of H.fc (hflgfc) (2) 657-662 F6.3 mag K.fc ? K fiducial Kron circular magnitude (kmfc) 664-668 F5.3 mag e_K.fc ? σ(K.fc) (kmsigfc) 670 I1 --- f_K.fc ? Confusion flags of K.fc (kflgfc) (2) -------------------------------------------------------------------------------- 672-676 F5.1 arcsec Jr.i20e ? Semi-major axis of elliptical aperture at isophote J=20mag/arcsec2 (jri20e) 678-683 F6.3 mag J.i20e ? J magnitude in Jr.i20e (jmi20e) 685-689 F5.3 mag e_J.i20e ? σ(J.i20e) (jmsigi20e) 691 I1 --- f_J.i20e ? Confusion flags of J.i20e (jflgi20e) (2) 693-697 F5.1 arcsec Hr.i20e ? Semi-major axis of elliptical aperture at isophote H=20mag/arcsec2 (hri20e) 699-704 F6.3 mag H.i20e ? H magnitude in Hr.i20e (hmi20e) 706-710 F5.3 mag e_H.i20e ? σ(H.i20e) (hmsigi20e) 712 I1 --- f_H.i20e ? Confusion flags of H.i20e (hflgi20e) (2) 714-718 F5.1 arcsec Kr.i20e ? Semi-major axis of elliptical aperture at isophote K=20mag/arcsec2 (kri20e) 720-725 F6.3 mag K.i20e ? K magnitude in Kr.i20e (kmi20e) 727-731 F5.3 mag e_K.i20e ? σ(K.i20e) (kmsigi20e) 733 I1 --- f_K.i20e ? Confusion flags of K.i20e (kflgi20e) (2) -------------------------------------------------------------------------------- 735-739 F5.1 arcsec Jr.i20c ? Radius of circular aperture at isophote J=20mag/arcsec2 (jri20c) 741-746 F6.3 mag J.i20c ? J magnitude in Jr.i20c (jmi20c) 748-752 F5.3 mag e_J.i20c ? σ(J.i20c) (jmsigi20c) 754 I1 --- f_J.i20c ? Confusion flags of J.i20c (jflgi20c) (2) 756-760 F5.1 arcsec Hr.i20c ? Radius of circular aperture at isophote H=20mag/arcsec2 Hr.i20c (hri20c) 762-767 F6.3 mag H.i20c ? H magnitude in (hmi20c) 769-773 F5.3 mag e_H.i20c ? σ(H.i20c) (hmsigi20c) 775 I1 --- f_H.i20c ? Confusion flags of H.i20c (hflgi20c) (2) 777-781 F5.1 arcsec Kr.i20c ? Radius of circular aperture at isophote H=20mag/arcsec2 Kr.i20c (kri20c) 783-788 F6.3 mag K.i20c ? K magnitude in (kmi20c) 790-794 F5.3 mag e_K.i20c ? σ(K.i20c) (kmsigi20c) 796 I1 --- f_K.i20c ? Confusion flags of K.i20c (kflgi20c) (2) -------------------------------------------------------------------------------- 798-802 F5.1 arcsec Jr.i21e ? Semi-major axis of elliptical aperture at isophote J=21mag/arcsec2 (jri21e) 804-809 F6.3 mag J.i21e ? J magnitude in Jr.i21e (jmi21e) 811-815 F5.3 mag e_J.i21e ? σ(J.i21e) (jmsigi21e) 817 I1 --- f_J.i21e ? Confusion flags of J.i21e (jflgi21e) (2) 819-823 F5.1 arcsec Hr.i21e ? Semi-major axis of elliptical aperture at isophote h=21mag/arcsec2 (hri21e) 825-830 F6.3 mag H.i21e ? H magnitude in Hr.i21e (hmi21e) 832-836 F5.3 mag e_H.i21e ? σ(H.i21e) (hmsigi21e) 838 I1 --- f_H.i21e ? Confusion flags of H.i21e (hflgi21e) (2) 840-844 F5.1 arcsec Kr.i21e ? Semi-major axis of elliptical aperture at isophote at K=21mag/arcsec2 (kri21e) 846-851 F6.3 mag K.i21e ? K magnitude in Kr.i21e (kmi21e) 853-857 F5.3 mag e_K.i21e ? σ(K.i21e) (kmsigi21e) 859 I1 --- f_K.i21e ? Confusion flags of K.i21e (kflgi21e) (2) -------------------------------------------------------------------------------- 861-865 F5.1 arcsec r.21fe ? Semi-major axis of fiducial elliptical aperture at J=21mag/arcsec2 (r_j21fe) 867-872 F6.3 mag J.21fe ? J magnitude in r.21fe (jmj21fe) 874-878 F5.3 mag e_J.21fe ? σ(J.21fe) (jmsigj21fe) 880 I1 --- f_J.21fe ? Confusion flags of J.21fe (jflgj21fe) (2) 882-887 F6.3 mag H.21fe ? H magnitude in r.21fe (hmj21fe) 889-893 F5.3 mag e_H.21fe ? σ(H.21fe) (hmsigj21fe) 895 I1 --- f_H.21fe ? Confusion flags of H.21fe (hflgj21fe) (2) 897-902 F6.3 mag K.21fe ? K magnitude in r.21fe (kmj21fe) 904-908 F5.3 mag e_K.21fe ? σ(K.21fe) (kmsigj21fe) 910 I1 --- f_K.21fe ? Confusion flags of K.21fe (kflgj21fe) (2) -------------------------------------------------------------------------------- 912-916 F5.1 arcsec Jr.i21c ? Radius of circular aperture at isophote J=21mag/arcsec2 (jri21c) 918-923 F6.3 mag J.i21c ? J magnitude in J.i21c (jmi21c) 925-929 F5.3 mag e_J.i21c ? σ(J.i21c) (jmsigi21c) 931 I1 --- f_J.i21c ? Confusion flags of J.i21c (jflgi21c) (2) 933-937 F5.1 arcsec Hr.i21c ? Radius of circular aperture at isophote H=21mag/arcsec2 (hri21c) 939-944 F6.3 mag H.i21c ? H magnitude in H.i21c (hmi21c) 946-950 F5.3 mag e_H.i21c ? σ(H.i21c) (hmsigi21c) 952 I1 --- f_H.i21c ? Confusion flags of H.i21c (hflgi21c) (2) 954-958 F5.1 arcsec Kr.i21c ? Radius of circular aperture at isophote K=21mag/arcsec2 (kri21c) 960-965 F6.3 mag K.i21c ? K magnitude in K.i21c (kmi21c) 967-971 F5.3 mag e_K.i21c ? σ(K.i21c) (kmsigi21c) 973 I1 --- f_K.i21c ? Confusion flags of K.i21c (kflgi21c) (2) -------------------------------------------------------------------------------- 975-979 F5.1 arcsec r.21fc ? J fiducial Kron circular radius at isophote J=21mag/arcsec2 mag (r_j21fc) 981-986 F6.3 mag J.21fc ? J magnitude in r.21fc (jmj21fc) 988-992 F5.3 mag e_J.21fc ? σ(J.21fc) (jmsigj21fc) 994 I1 --- f_J.21fc ? Confusion flags of J.21fc (jflgj21fc) (2) 996-1001 F6.3 mag H.21fc ? magnitude in r.21fc (hmj21fc) 1003-1007 F5.3 mag e_H.21fc ? σ(H.21fc) (hmsigj21fc) 1009 I1 --- f_H.21fc ? Confusion flags of H.21fc (hflgj21fc) (2) 1011-1016 F6.3 mag K.21fc ? K magnitude in r.21fc (kmj21fc) 1018-1022 F5.3 mag e_K.21fc ? σ(K.21fc) (kmsigj21fc) 1024 I1 --- f_K.21fc ? Confusion flags of K.21fc (kflgj21fc) (2) -------------------------------------------------------------------------------- 1026-1031 F6.3 mag J.a5 ? J magnitude in 5arcsec aperture (jm5) 1033-1037 F5.3 mag e_J.a5 ? σ(J.a5) (jmsig5) 1039 I1 --- f_J.a5 ? Confusion flags of J.a5 (jflg5) (2) 1041-1046 F6.3 mag H.a5 ? H magnitude in 5arcsec aperture (hm5) 1048-1052 F5.3 mag e_H.a5 ? σ(H.a5) (hmsig5) 1054 I1 --- f_H.a5 ? Confusion flags of H.a5 (hflg5) (2) 1056-1061 F6.3 mag K.a5 ? K magnitude in 5arcsec aperture (km5) 1063-1067 F5.3 mag e_K.a5 ? σ(K.a5) (kmsig5) 1069 I1 --- f_K.a5 ? Confusion flags of K.a5 (kflg5) (2) -------------------------------------------------------------------------------- 1071-1076 F6.3 mag J.a7 ? J magnitude in 7arcsec aperture (jm7) 1078-1082 F5.3 mag e_J.a7 ? σ(J.a7) (jmsig7) 1084 I1 --- f_J.a7 ? Confusion flags of J.a7 (jflg7) (2) 1086-1091 F6.3 mag H.a7 ? H magnitude in 7arcsec aperture (hm7) 1093-1097 F5.3 mag e_H.a7 ? σ(H.a7) (hmsig7) 1099 I1 --- f_H.a7 ? Confusion flags of H.a7 (hflg7) (2) 1101-1106 F6.3 mag K.a7 ? K magnitude in 7arcsec aperture (km7) 1108-1112 F5.3 mag e_K.a7 ? σ(K.a7) (kmsig7) 1114 I1 --- f_K.a7 ? Confusion flags of K.a7 (kflg7) (2) -------------------------------------------------------------------------------- 1116-1121 F6.3 mag J.10 ? J magnitude in 10arcsec aperture (jm10) 1123-1127 F5.3 mag e_J.10 ? σ(J.10) (jmsig10) 1129 I1 --- f_J.10 ? Confusion flags of J.10 (jflg10) (2) 1131-1136 F6.3 mag H.10 ? H magnitude in 10arcsec aperture (hm10) 1138-1142 F5.3 mag e_H.10 ? σ(H.10) (hmsig10) 1144 I1 --- f_H.10 ? Confusion flags of H.10 (hflg10) (2) 1146-1151 F6.3 mag K.10 ? K magnitude in 10arcsec aperture (km10) 1153-1157 F5.3 mag e_K.10 ? σ(K.10) (kmsig10) 1159 I1 --- f_K.10 ? Confusion flags of K.10 (kflg10) (2) -------------------------------------------------------------------------------- 1161-1166 F6.3 mag J.15 ? J magnitude in 15arcsec aperture (jm15) 1168-1172 F5.3 mag e_J.15 ? σ(J.15) (jmsig15) 1174 I1 --- f_J.15 ? Confusion flags of J.15 (jflg15) (2) 1176-1181 F6.3 mag H.15 ? H magnitude in 15arcsec aperture (hm15) 1183-1187 F5.3 mag e_H.15 ? σ(H.15) (hmsig15) 1189 I1 --- f_H.15 ? Confusion flags of H.15 (hflg15) (2) 1191-1196 F6.3 mag K.15 ? K magnitude in 15arcsec aperture (km15) 1198-1202 F5.3 mag e_K.15 ? σ(K.15) (kmsig15) 1204 I1 --- f_K.15 ? Confusion flags of K.15 (kflg15) (2) -------------------------------------------------------------------------------- 1206-1211 F6.3 mag J.20 ? J magnitude in 20arcsec aperture (jm20) 1213-1217 F5.3 mag e_J.20 ? σ(J.20) (jmsig20) 1219 I1 --- f_J.20 ? Confusion flags of J.20 (jflg20) (2) 1221-1226 F6.3 mag H.20 ? H magnitude in 20arcsec aperture (hm20) 1228-1232 F5.3 mag e_H.20 ? σ(H.20) (hmsig20) 1234 I1 --- f_H.20 ? Confusion flags of H.20 (hflg20) (2) 1236-1241 F6.3 mag K.20 ? K magnitude in 20arcsec aperture (km20) 1243-1247 F5.3 mag e_K.20 ? σ(K.20) (kmsig20) 1249 I1 --- f_K.20 ? Confusion flags of K.20 (kflg20) (2) -------------------------------------------------------------------------------- 1251-1256 F6.3 mag J.25 ? J magnitude in 25arcsec aperture (jm25) 1258-1262 F5.3 mag e_J.25 ? σ(J.25) (jmsig25) 1264 I1 --- f_J.25 ? Confusion flags of J.25 (jflg25) (2) 1266-1271 F6.3 mag H.25 ? H magnitude in 25arcsec aperture (hm25) 1273-1277 F5.3 mag e_H.25 ? σ(H.25) (hmsig25) 1279 I1 --- f_H.25 ? Confusion flags of H.25 (hflg25) (2) 1281-1286 F6.3 mag K.25 ? K magnitude in 25arcsec aperture (km25) 1288-1292 F5.3 mag e_K.25 ? σ(K.25) (kmsig25) 1294 I1 --- f_K.25 ? Confusion flags of K.25 (kflg25) (2) -------------------------------------------------------------------------------- 1296-1301 F6.3 mag J.30 ? J magnitude in 30arcsec aperture (jm30) 1303-1307 F5.3 mag e_J.30 ? σ(J.30) (jmsig30) 1309 I1 --- f_J.30 ? Confusion flags of J.30 (jflg30) (2) 1311-1316 F6.3 mag H.30 ? H magnitude in 30arcsec aperture (hm30) 1318-1322 F5.3 mag e_H.30 ? σ(H.30) (hmsig30) 1324 I1 --- f_H.30 ? Confusion flags of H.30 (hflg30) (2) 1326-1331 F6.3 mag K.30 ? K magnitude in 30arcsec aperture (km30) 1333-1337 F5.3 mag e_K.30 ? σ(K.30) (kmsig30) 1339 I1 --- f_K.30 ? Confusion flags of K.30 (kflg30) (2) -------------------------------------------------------------------------------- 1341-1346 F6.3 mag J.40 ? J magnitude in 40arcsec aperture (jm40) 1348-1352 F5.3 mag e_J.40 ? σ(J.40) (jmsig40) 1354 I1 --- f_J.40 ? Confusion flags of J.40 (jflg40) (2) 1356-1361 F6.3 mag H.40 ? H magnitude in 40arcsec aperture (hm40) 1363-1367 F5.3 mag e_H.40 ? σ(H.40) (hmsig40) 1369 I1 --- f_H.40 ? Confusion flags of H.40 (hflg40) (2) 1371-1376 F6.3 mag K.40 ? K magnitude in 40arcsec aperture (km40) 1378-1382 F5.3 mag e_K.40 ? σ(K.40) (kmsig40) 1384 I1 --- f_K.40 ? Confusion flags of K.40 (kflg40) (2) -------------------------------------------------------------------------------- 1386-1391 F6.3 mag J.50 ? J magnitude in 50arcsec aperture (jm50) 1393-1397 F5.3 mag e_J.50 ? σ(J.50) (jmsig50) 1399 I1 --- f_J.50 ? Confusion flags of J.50 (jflg50) 1401-1406 F6.3 mag H.50 ? H magnitude in 50arcsec aperture (hm50) 1408-1412 F5.3 mag e_H.50 ? σ(H.50) (hmsig50) 1414 I1 --- f_H.50 ? Confusion flags of H.50 (hflg50) (2) 1416-1421 F6.3 mag K.50 ? K magnitude in 50arcsec aperture (km50) 1423-1427 F5.3 mag e_K.50 ? σ(K.50) (kmsig50) 1429 I1 --- f_K.50 ? Confusion flags of K.50 (kflg50) (2) -------------------------------------------------------------------------------- 1431-1436 F6.3 mag J.60 ? J magnitude in 60arcsec aperture (jm60) 1438-1442 F5.3 mag e_J.60 ? σ(J.60) (jmsig60) 1444 I1 --- f_J.60 ? Confusion flags of J.60 (jflg60) (2) 1446-1451 F6.3 mag H.60 ? H magnitude in 60arcsec aperture (hm60) 1453-1457 F5.3 mag e_H.60 ? σ(H.60) (hmsig60) 1459 I1 --- f_H.60 ? Confusion flags of H.60 (hflg60) (2) 1461-1466 F6.3 mag K.60 ? K magnitude in 60arcsec aperture (km60) 1468-1472 F5.3 mag e_K.60 ? σ(K.60) (kmsig60) 1474 I1 --- f_K.60 ? Confusion flags of K.60 (kflg60) (2) -------------------------------------------------------------------------------- 1476-1481 F6.3 mag J.70 ? J magnitude in 70arcsec aperture (jm70) 1483-1487 F5.3 mag e_J.70 ? σ(J.70) (jmsig70) 1489 I1 --- f_J.70 ? Confusion flags of J.70 (jflg70) (2) 1491-1496 F6.3 mag H.70 ? H magnitude in 70arcsec aperture (hm70) 1498-1502 F5.3 mag e_H.70 ? σ(H.70) (hmsig70) 1504 I1 --- f_H.70 ? Confusion flags of H.70 (hflg70) (2) 1506-1511 F6.3 mag K.70 ? K magnitude in 70arcsec aperture (km70) 1513-1517 F5.3 mag e_K.70 ? σ(K.70) (kmsig70) 1519 I1 --- f_K.70 ? Confusion flags of K.70 (kflg70) (2) -------------------------------------------------------------------------------- 1521-1526 F6.3 mag J.sys ? J system magnitude (jmsys) (11) 1528-1532 F5.3 mag e_J.sys ? σ(J.sys) (jmsigsys) 1534-1539 F6.3 mag H.sys ? H system magnitude (hmsys) (11) 1541-1545 F5.3 mag e_H.sys ? σ(H.sys) (hmsigsys) 1547-1552 F6.3 mag K.sys ? K system magnitude (kmsys) (11) 1554-1558 F5.3 mag e_K.sys ? σ(K.sys) (kmsigsys) 1560 I1 --- sysFlg [0,1]? system flag: 0=no system, 1=nearby galaxy flux (sys_flg) 1562 I1 --- ctmFlg [0,1]? contamination flag: 0=no stars, 1=stellar flux (contam_flg) -------------------------------------------------------------------------------- 1564-1568 F5.3 --- Jba5s ? J minor/major axis ratio to 5σ fit (j5sigba) 1570-1572 I3 deg Jpa5s ? J pos.angle to 5σ fit (j5sigphi) 1574-1578 F5.3 --- Hba5s ? H minor/major axis ratio to 5σ fit (h5sigba) 1580-1582 I3 deg Hpa5s ? H pos.angle to 5σ fit (h5sigphi) 1584-1588 F5.3 --- Kba5s ? K minor/major axis ratio to 5σ fit (k5sigba) 1590-1592 I3 deg Kpa5s ? K pos.angle to 5σ fit (k5sigphi) -------------------------------------------------------------------------------- 1594-1596 I3 --- JdA ? J 5σ/3σ differential area (jdarea) 1598-1600 I3 % JpcdA ? J 5σ/3σ relative area change (jpercdarea) 1602-1604 I3 --- HdA ? H 5σ/3σ differential area (hdarea) 1606-1608 I3 % HpcdA ? H 5σ/3σ relative area change (hpercdarea) 1610-1612 I3 --- KdA ? K 5σ/3σ differential area (kdarea) 1614-1616 I3 % KpcdA ? K 5σ/3σ relative area change (kpercdarea) -------------------------------------------------------------------------------- 1618-1622 F5.3 --- Jrat.bs ? J bi-symmetric flux ratio (jbisymrat) 1624-1629 F6.3 --- Jchi.bs ? J bi-symmetric x-correlation (jbisymchi) 1631-1635 F5.3 --- Hrat.bs ? H bi-symmetric flux ratio (hbisymrat) 1637-1642 F6.3 --- Hchi.bs ? H bi-symmetric x-correlation (hbisymchi) 1644-1648 F5.3 --- Krat.bs ? K bi-symmetric flux ratio (kbisymrat) 1650-1655 F6.3 --- Kchi.bs ? K bi-symmetric x-correlation (kbisymchi) -------------------------------------------------------------------------------- 1657-1661 F5.2 --- Jsh0 ? J ridge shape (LCSB: BSNR limit) (j_sh0) 1663-1667 F5.2 --- e_Jsh0 ? σ(Jsh0) (jsigsh0) 1669-1673 F5.2 --- Hsh0 ? H ridge shape (LCSB: BSNR limit) (h_sh0) 1675-1679 F5.2 --- e_Hsh0 ? σ(Jsh0) (hsigsh0) 1681-1685 F5.2 --- Ksh0 ? K ridge shape (LCSB: BSNR limit) (k_sh0) 1687-1691 F5.2 --- e_Ksh0 ? σ(Jsh0) (ksigsh0) 1693-1698 F6.1 --- Jsc.mx ? J mxdn score (LCSB: BSNR - block/smoothed SNR) (jscmxdn) 1700-1705 F6.1 --- Jsc.sh ? J shape score (jscsh) 1707-1712 F6.1 --- Jsc.wsh ? J wsh score (LCSB: PSNR - peak raw SNR) (jscwsh) 1714-1719 F6.1 --- Jsc.r23 ? J r23 score (LCSB: TSNR - integrated SNR for r=15) (jscr23) 1721-1726 F6.1 --- Jsc.1mm ? J 1st moment score (LCSB: super blk 2,4,8 SNR) (jsc1mm) 1728-1733 F6.1 --- Jsc.2mm ? J 2nd moment score (LCSB: SNRMAX - super SNR max.) (jsc2mm) 1735-1740 F6.1 --- Jsc.vint ? J vint score (jscvint) 1742-1747 F6.1 --- Jsc.r1 ? J r1 score (jscr1) 1749-1754 F6.1 --- Jsc.msh [0]? J median shape score (jscmsh) 1756-1761 F6.1 --- Hsc.mx ? H mxdn score (LCSB: BSNR - block/smoothed SNR) (hscmxdn) 1763-1768 F6.1 --- Hsc.sh ? H shape score (hscsh) 1770-1775 F6.1 --- Hsc.wsh ? H wsh score (LCSB: PSNR - peak raw SNR) (hscwsh) 1777-1782 F6.1 --- Hsc.r23 ? H r23 score (LCSB: TSNR - integrated SNR for r=15) (hscr23) 1784-1789 F6.1 --- Hsc.1mm ? H 1st moment score (LCSB: super blk 2,4,8 SNR) (hsc1mm) 1791-1796 F6.1 --- Hsc.2mm ? H 2nd moment score (LCSB: SNRMAX - super SNR max.) (hsc2mm) 1798-1803 F6.1 --- Hsc.vint ? H vint score (hscvint) 1805-1810 F6.1 --- Hsc.r1 ? H r1 score (hscr1) 1812-1817 F6.1 --- Hsc.msh [0]? H median shape score (hscmsh) 1819-1824 F6.1 --- Ksc.mx ? K mxdn score (LCSB: BSNR - block/smoothed SNR) (kscmxdn) 1826-1831 F6.1 --- Ksc.sh ? K shape score (kscsh) 1833-1838 F6.1 --- Ksc.wsh ? K wsh score (LCSB: PSNR - peak raw SNR) (kscwsh) 1840-1845 F6.1 --- Ksc.r23 ? K r23 score (LCSB: TSNR - integrated SNR for r=15) (kscr23) 1847-1852 F6.1 --- Ksc.1mm ? K 1st moment score (LCSB: super blk 2,4,8 SNR) (ksc1mm) 1854-1859 F6.1 --- Ksc.2mm ? K 2nd moment score (LCSB: SNRMAX - super SNR max.) (ksc2mm) 1861-1866 F6.1 --- Ksc.vint ? K vint score (kscvint) 1868-1873 F6.1 --- Ksc.r1 ? K r1 score (kscr1) 1875-1880 F6.1 --- Ksc.msh [0]? K median shape score (kscmsh) 1882-1887 F6.1 % Jchi.ellf ? J chi-fraction for elliptical fit to 3σ isophote (jchifellf) 1889-1894 F6.1 % Kchi.ellf ? K chi-fraction for elliptical fit to 3σ isophote (kchifellf) 1896 I1 --- ellfFlg [0,1]? ellipse fitting contamination flag (0=no contamination) (ellfit_flg) 1898-1903 F6.1 % Schi.ellf ? super-coadd chi-fraction for elliptical fit to 3σ isophote (supchifellf) -------------------------------------------------------------------------------- 1905-1908 I4 --- Nbln [0]? Number of blanked sources (n_blank) 1910-1913 I4 --- Nsub [0]? Number of subtracted sources (n_sub) 1915 I1 --- f_Nsub [0]? blanked/subtracted description flag (blsubflg) -------------------------------------------------------------------------------- 1917 I1 --- xid [0,1] Type/galaxy source (id_flg) (7) 1919-1938 A20 --- idGal Matched galaxy's catalog name (id_cat) 1940-1945 A6 --- fgFlg [_] flux-growth convergence flag (fg_flg) 1947 I1 --- LCSBbf [1]? LCSB blocking factor (1,2,4,8) (blk_fac) 1949 I1 --- dupSrc [0,5] Duplicate source flag (dup_src) (8) 1951 I1 --- useSrc [0,1] Use source flag (use_src) (9) 1953-1957 F5.1 arcsec prox Distance to nearest neighbor in PSC (prox) 1959-1961 I3 deg pxpa ? pos.angle of vector to prox (pxpa) 1963-1972 I10 --- pxKey ext_key value of nearest XSC source (pxcntr) 1974-1978 I5 arcsec edge.ns ? Distance to nearest N/S edge (distedgens) 1980-1982 I3 arcsec edge.ew ? Distance to nearest E/W edge (distedgeew) 1984-1985 A2 --- edgeFlg [nswe ] nearest edge (distedgeflg) 1987-1996 I10 --- ptsKey ? Key to source data DB record (pts_key) 1998-2002 I5 --- mpKey ? Key to minor planet prediction (mp_key) 2004-2007 I4 --- nightKey ? key to night data record (night_key) 2009-2014 I6 --- scanKey ? key to scan data record (scan_key) 2016-2022 I7 --- coaddKey ? key to coadd data record (coadd_key) 2024 A1 --- hemis [ns] hemisphere of observation: n = North/Mt.Hopkins; s= South/CTIO (hemis) 2026-2035 A10 "YYYY-MM-DD" date UT day of observation (date) (10) 2037-2039 I3 --- scan ? scan number (unique within date) (scan) 2041-2043 I03 --- coadd ? 3-digit coadd number (unique within scan) (coadd) 2045-2050 I6 --- ID ? source ID number (unique within scan+coadd) (id) 2052-2057 F6.1 arcsec Xcoadd ? x (cross-scan) position (x_coadd) 2059-2064 F6.1 arcsec Ycoadd ? y (in-scan) position (y_coadd) 2066-2071 F6.1 --- Jsubst2 [0]? J residual background#2 score (j_subst2) 2073-2078 F6.1 --- Hsubst2 [0]? H residual background#2 score (h_subst2) 2080-2085 F6.1 --- Ksubst2 [0]? K residual background#2 score (k_subst2) 2087-2092 F6.1 --- Jbg ? J coadd median background (j_back) 2094-2099 F6.1 --- Hbg ? H coadd median background (h_back) 2101-2106 F6.1 --- Kbg ? K coadd median background (k_back) 2108-2114 F7.3 --- Jres.ann ? J residual annulus background median (jresidann) 2116-2122 F7.3 --- Hres.ann ? H residual annulus background median (hresidann) 2124-2130 F7.3 --- Kres.ann ? K residual annulus background median (kresidann) 2132-2136 I5 arcsec JbgPer ? J banding FT period (jbndgper) 2138-2143 F6.3 --- JbgAmp ? J banding maximum FT amplitude (jbndgamp) 2145-2149 I5 arcsec HbgPer ? H banding FT period (hbndgper) 2151-2156 F6.3 --- HbgAmp ? H banding maximum FT amplitude (hbndgamp) 2158-2162 I5 arcsec KbgPer ? K banding FT period (kbndgper) 2164-2169 F6.3 --- KbgAmp ? K banding maximum FT amplitude (kbndgamp) 2171-2174 F4.1 --- Jtrack ? J band seetracking score (j_seetrack) 2176-2179 F4.1 --- Htrack ? H band seetracking score (h_seetrack) 2181-2184 F4.1 --- Ktrack ? K band seetracking score (k_seetrack) 2186-2194 I9 --- extKey entry counter (key) number (ext_key)
Note (1): Julian date of the source measurement is accurate to ±3 minutes. This value is the mean Julian date of the scan observation in which this source falls. Note (2): The confusion flags are defined as follows: 0 = no other sources within aperture used 1 = aperture contained pixels masked off in coadd 2 = aperture contained pixels masked off due to neighboring sources 3 = aperture contained pixels that had a point source flux subtracted off 4 = aperture contained pixels within bright star mask 5 = aperture contained pixels masked off due to persistence 6 = aperture ran into coadd boundary 7 = aperture contained pixels within bright galaxy mask 9 = integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)]; the resulting mag range is between ∼ 75 and 99. Note (3): the concentration index is the ratio of effective radius at 75% and 25% of the light, r(75%)/r(25%) Note (4): score in the range 1(extended) < score < 2(point-like). Note (5): the visual verification score gives the source type of sources examined "by eye", as follows: -2 = unknown -1 = no verification (i.e., not examined) 1 = galaxy 2 = non-extended (e.g., star, double, triple, artifact) Note (6): The contamination/confusion flag indicates whether the source's photometry and position may be affected by artifacts of, or confusion with, nearby bright stars. Sources are tested for contamination and/or confusion in the order given below, and once a flag is applied to the source, testing is stopped in that band. The flag values indicate the source may be: U = unreliable source; probable image artifact detection (none) C = affected by confusion with or artifact of a nearby bright star (none) A or a = known artifacts z = in close proximity to a large galaxy; these sources are usually junk Z = Derived from the Large Galaxy Atlas 0 = default value -- not contaminated Note (7): flag indicating the extended source catalog type as follows: 0 = extended source not found in another catalog 1 = extended source is found in galaxy catalog (ID found in idGal field) 2 = LCSB (Low Central Surface Brightness) source Note (8): Duplicate source flag, used in conjunction with the useSrc flag. This numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times. 0 = the source does not fall within a Tile overlap region (useSrc=1), or it falls in an overlap region and there were no sources detected within 2" of its position in the overlapping Tile (useSrc=0). 1 = the source falls within a Tile overlap region, and there is one source detected within 2" of its position in the overlapping Tile. >1 = the source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure. Note (9): Use source flag, used in conjunction with the dupSrc flag. This numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution. 0 = the source falls in a Tile overlap region, but does not have a detection within 2" of its position in any overlapping Tiles. PSC sources with useSrc=0 will always have dupSrc=0. Such objects are usually faint, and thus toggling above and below the detection limits, or may have moved between the scans of the different Tiles. 1 = The source does not fall in a Tile overlap region (dupSrc=0), or it falls in an overlap region, but lies farther from its scan edge than any apparition of the source in another Tile. A source must have useSrc=1 to be considered part of the sub-Catalog that satisfies the 2MASS Level 1 Science Requirements >1 = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure. Note (10): The observation reference date for this source expressed in ISO standard format. This is the UT day value at sunrise for the night on which the source was observed. Because it is possible for the UT day to change during a night of observations, the actual UT date for a source measurement can differ from date by one day. Use the Julian Day value (jdate) for a more accurate determination of the observation time of the source. Note (11): The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
Nomenclature Notes: The recommended naming of the 2MASS Extended Sources Catalog is 2MASX JHHMMSSss+DDMMSSs, i.e. adding a 'J' to formalize the expression of the position in the J2000 system. History: From DVD-ROMs of 2MASS catalogues
(End) Francois Ochsenbein [CDS] 29-Apr-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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