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II/306 The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
The SDSS Photometric Catalog, Release 8 Adelman-McCarthy J.K. et al. <To be published> =2011yCat.2306....0A
ADC_Keywords: Surveys; Photometry, SDSS ; Redshifts Keywords: atlases - catalogs - surveys Abstract: Description: Official SDSS-III Acknowledgement We request that the following be added to the acknowledgement section of any paper using data from the SDSS-III. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, University of Florida, the French Participation Group, the German Participation Group, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sdss8.sam 953 125 *Sample output of the SDSS photometric catalog
Note on sdss8.sam: a sample close to the point (0,0) is given in "sdss8.sam". The catalog described here is a subset of the full SDSS catalog available from http://www.sdss3.org/dr8/ restricted to primary and secondary photo objects, and with a selection of the columns of the full catalog. Column names (labels) frequently differ from their original names, in which case the original name is added to the description of the original column.
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) http://www.sdss.org/ : The SDSS Home Page http://www.sdss3.org/dr8/ : The Eighth SDSS Data Release Home Page (2011) Byte-by-byte Description of file: sdss8.sam
Bytes Format Units Label Explanations
1 I1 --- mode [1,2] 1: primary (469,053,874 sources), 2: secondary (324,960,076 sources). 2 A1 --- q_mode [+] '+' indicates clean photometry (105,969,748 sources with mode 1+) 3 I1 --- cl Type (class) of object (3=galaxy, 6=star) (1) 5- 23 A19 --- SDSS8 SDSS-DR8 name, based on J2000 position 24 A1 --- m_SDSS8 [*] The asterisk indicates that 2 different SDSS objects share the same SDSS8 name 26 A1 --- R [8] Release inclusion (all observations were reprocessed, value is always 8) 28- 47 A20 --- SDSS-ID [0-9-] SDSS object identifier (2) 49- 67 I19 --- objID SDSS unique object identifier (2) 69- 87 I19 --- SpObjID Pointer to the spectrum of object, or 0 (7) 89-107 I19 --- parentID Pointer to parent (if object deblended) 109-124 A16 --- flags Photo Object Attribute flags (3) 126-133 A8 --- Status Hexadecimal status (4) 136-145 F10.6 deg RAdeg Right Ascension of the object (ICRS) (ra) 146-155 F10.6 deg DEdeg Declination of the object (ICRS) (dec) 157-161 F5.3 arcsec e_RAdeg Mean error on RAdeg (raErr) 163-167 F5.3 arcsec e_DEdeg Mean error on DEdeg (decErr) 169-177 F9.4 yr ObsDate Mean Observation date 179 I1 --- Q Quality of the observation (0=unknown): 1=bad 2=acceptable 3=good 4=missing 5=hole (6) 181-187 F7.5 --- zsp ? Spectroscopic redshift (when SpObjID>0) (7) 188 A1 --- --- [:] 189-194 F6.5 --- e_zsp ? Mean error on zsp (7) 196-201 F6.3 mag umag ? Model magnitude in u filter, AB scale (u) (5) 202 A1 --- --- [:] 203-207 F5.3 mag e_umag ? Mean error on umag (err_u) 209-214 F6.3 mag gmag ? Model magnitude in g filter, AB scale (g) (5) 215 A1 --- --- [:] 216-220 F5.3 mag e_gmag ? Mean error on gmag (err_g) 222-227 F6.3 mag rmag ? Model magnitude in r filter, AB scale (r) (5) 228 A1 --- --- [:] 229-233 F5.3 mag e_rmag ? Mean error on rmag (err_r) 235-240 F6.3 mag imag ? Model magnitude in i filter, AB scale (i) (5) 241 A1 --- --- [:] 242-246 F5.3 mag e_imag ? Mean error on imag (err_i) 248-253 F6.3 mag zmag ? Model magnitude in z filter, AB scale (z) (5) 254 A1 --- --- [:] 255-259 F5.3 mag e_zmag ? Mean error on zmag (err_z) -------------------------------------------------------------------------------- 261-276 A16 --- uFlags Detection flags, u band (flags_u)(3) 278 I1 --- us [0,1] 0=notStar, 1=Star in u band (probPSF_u) 280 I1 --- uc [0,9] Phototype in u band, 6=Star (type_u) (1) 282-290 F9.4 yr uDate Date of observation in u band (6) 292-297 F6.3 mag u'mag ? Model magnitude in u filter (= umag) (5) 298 A1 --- --- [:] 299-304 F6.3 mag e_u'mag ? Mean error on u'mag (= e_umag) 306-311 F6.3 mag upmag ? PSF magnitude in u band (psfMag_u) 312 A1 --- --- [:] 313-318 F6.3 mag e_upmag ? Mean error on upmag (psfMagErr_u) 320-325 F6.3 mag uPmag ? Petrosian magnitude in u band (petroMag_u) 326 A1 --- --- [:] 327-332 F6.3 mag e_uPmag ? Mean error on uPmag (petroMagErr_u) 334-340 F7.3 arcsec uPrad ? Petrosian radius in u band (petroRad_u) 341 A1 --- --- [:] 342-348 F7.3 arcsec e_uPrad ? Mean error in uPrad (petroRadErr_u) 351-356 F6.2 arcsec uoRA ? Offset of u position along RA (offsetRa_u) 358-363 F6.2 arcsec uoDE ? Offset of u position along Dec (offsetDec_u) 365-371 F7.3 arcsec udVrad ? de Vaucouleurs fit radius, u band (deVRad_u) 373-379 F7.3 arcsec udVell ? de Vaucouleurs fit ellipt, u band (1-deVAB_u) 381-385 F5.1 deg uPA ? Position angle of dVrad in u band (deVPhi_u) -------------------------------------------------------------------------------- 387-402 A16 --- gFlags Detection flags, g band (flags_g)(3) 404 I1 --- gs [0,1] 0=notStar, 1=Star in g band (probPSF_g) 406 I1 --- gc [0,9] Phototype in g band, 6=Star (type_g) (1) 408-416 F9.4 yr gDate Date of observation in g band (6) 418-423 F6.3 mag g'mag ? Model magnitude in g filter (= gmag) (5) 424 A1 --- --- [:] 425-430 F6.3 mag e_g'mag ? Mean error on g'mag (= e_gmag) 432-437 F6.3 mag gpmag ? PSF magnitude in g band (psfMag_g) 438 A1 --- --- [:] 439-444 F6.3 mag e_gpmag ? Mean error on gpmag (psfMagErr_g) 446-451 F6.3 mag gPmag ? Petrosian magnitude in g band (petroMag_g) 452 A1 --- --- [:] 453-458 F6.3 mag e_gPmag ? Mean error on gPmag (petroMagErr_g) 460-466 F7.3 arcsec gPrad ? Petrosian radius in g band (petroMagErr_g) 467 A1 --- --- [:] 468-474 F7.3 arcsec e_gPrad ? Mean error in gPrad (petroMagErr_g) 477-482 F6.2 arcsec goRA ? Offset of g position along RA (offsetRa_g) 484-489 F6.2 arcsec goDE ? Offset of g position along Dec (offsetDec_g) 491-497 F7.3 arcsec gdVrad ? de Vaucouleurs fit radius, g band (deVRad_g) 499-505 F7.3 arcsec gdVell ? de Vaucouleurs fit ellipt, g band (1-deVAB_g) 507-511 F5.1 deg gPA ? Position angle of dVrad in g band (deVPhi_g) -------------------------------------------------------------------------------- 513-528 A16 --- rFlags Detection flags, r band (flags_r)(3) 530 I1 --- rs [0,1] 0=notStar, 1=Star in r band (probPSF_r) 532 I1 --- rc [0,9] Phototype in r band, 6=Star (type_r) (1) 534-542 F9.4 yr rDate Date of observation in r band (6) 544-549 F6.3 mag r'mag ? Model magnitude in r filter (= rmag) (5) 550 A1 --- --- [:] 551-556 F6.3 mag e_r'mag ? Mean error on r'mag (= e_rmag) 558-563 F6.3 mag rpmag ? PSF magnitude in r band (psfMag_r) 564 A1 --- --- [:] 565-570 F6.3 mag e_rpmag ? Mean error on rpmag (psfMagErr_r) 572-577 F6.3 mag rPmag ? Petrosian magnitude in r band (petroMag_r) 578 A1 --- --- [:] 579-584 F6.3 mag e_rPmag ? Mean error on rPmag (petroMagErr_r) 586-592 F7.3 arcsec rPrad ? Petrosian radius in r band (petroMagErr_r) 593 A1 --- --- [:] 594-600 F7.3 arcsec e_rPrad ? Mean error in rPrad (petroMagErr_r) 603-608 F6.2 arcsec roRA ? Offset of r position along RA (offsetRa_r) 610-615 F6.2 arcsec roDE ? Offset of r position along Dec (offsetDec_r) 617-623 F7.3 arcsec rdVrad ? de Vaucouleurs fit radius, r band (deVRad_r) 625-631 F7.3 arcsec rdVell ? de Vaucouleurs fit ellipt, r band (1-deVAB_r) 633-637 F5.1 deg rPA ? Position angle of dVrad in r band (deVPhi_r) -------------------------------------------------------------------------------- 639-654 A16 --- iFlags Detection flags, i band (flags_i)(3) 656 I1 --- is [0,1] 0=notStar, 1=Star in i band (probPSF_i) 658 I1 --- ic [0,9] Phototype in i band, 6=Star (type_i) (1) 660-668 F9.4 yr iDate Date of observation in i band (6) 670-675 F6.3 mag i'mag ? Model magnitude in i filter (= imag) (5) 676 A1 --- --- [:] 677-682 F6.3 mag e_i'mag ? Mean error on i'mag (= e_imag) 684-689 F6.3 mag ipmag ? PSF magnitude in i band (psfMag_i) 690 A1 --- --- [:] 691-696 F6.3 mag e_ipmag ? Mean error on ipmag (psfMagErr_i) 698-703 F6.3 mag iPmag ? Petrosian magnitude in i band (petroMag_i) 704 A1 --- --- [:] 705-710 F6.3 mag e_iPmag ? Mean error on iPmag (petroMagErr_i) 712-718 F7.3 arcsec iPrad ? Petrosian radius in i band (petroMagErr_i) 719 A1 --- --- [:] 720-726 F7.3 arcsec e_iPrad ? Mean error in iPrad (petroMagErr_i) 729-734 F6.2 arcsec ioRA ? Offset of i position along RA (offsetRa_i) 736-741 F6.2 arcsec ioDE ? Offset of i position along Dec (offsetDec_i) 743-749 F7.3 arcsec idVrad ? de Vaucouleurs fit radius, i band (deVRad_i) 751-757 F7.3 arcsec idVell ? de Vaucouleurs fit ellipt, i band (1-deVAB_i) 759-763 F5.1 deg iPA ? Position angle of dVrad in i band (deVPhi_i) -------------------------------------------------------------------------------- 765-780 A16 --- zFlags Detection flags, z band (flags_z)(3) 782 I1 --- zs [0,1] 0=notStar, 1=Star in z band (probPSF_z) 784 I1 --- zc [0,9] Phototype in z band, 6=Star (type_z) (1) 786-794 F9.4 yr zDate Date of observation in z band (6) 796-801 F6.3 mag z'mag ? Model magnitude in z filter (= zmag) (5) 802 A1 --- --- [:] 803-808 F6.3 mag e_z'mag ? Mean error on z'mag (= e_zmag) 810-815 F6.3 mag zpmag ? PSF magnitude in z band (psfMag_z) 816 A1 --- --- [:] 817-822 F6.3 mag e_zpmag ? Mean error on zpmag (psfMagErr_z) 824-829 F6.3 mag zPmag ? Petrosian magnitude in z band (petroMag_z) 830 A1 --- --- [:] 831-836 F6.3 mag e_zPmag ? Mean error on zPmag (petroMagErr_z) 838-844 F7.3 arcsec zPrad ? Petrosian radius in z band (petroMagErr_z) 845 A1 --- --- [:] 846-852 F7.3 arcsec e_zPrad ? Mean error in zPrad (petroMagErr_z) 855-860 F6.2 arcsec zoRA ? Offset of z position along RA (offsetRa_z) 862-867 F6.2 arcsec zoDE ? Offset of z position along Dec (offsetDec_z) 869-875 F7.3 arcsec zdVrad ? de Vaucouleurs fit radius, z band (deVRad_z) 877-883 F7.3 arcsec zdVell ? de Vaucouleurs fit ellipt, z band (1-deVAB_z) 885-889 F5.1 deg zPA ? Position angle of dVrad in z band (deVPhi_z) -------------------------------------------------------------------------------- 891-896 I6 mas/yr pmRA ? Proper motion along RightAscension (pmRa) (8) 897 A1 --- --- [:] 898-900 I3 mas/yr e_pmRA ? Mean error on pmRA (pmRaErr) (8) 902-907 I6 mas/yr pmDE ? Proper motion along Declination (pmDec) (8) 908 A1 --- --- [:] 909-911 I3 mas/yr e_pmDE ? Mean error on pmDE (pmDecErr) (8) 913-917 F5.3 arcsec sigRA ? RMS residual of proper motion fit in RA (8) 919-923 F5.3 arcsec sigDE ? RMS residual of proper motion fit in Dec (8) 925 I1 --- M Number of USNO-B objects matched within 1arcsec (match) (8) 927 I1 --- N Number of detections used in the pm fit, including SDSS (nFit) (8) 929-932 F4.1 mag g(O) ? Magnitude from O plate recalibrated to g (8) 934-937 F4.1 mag r(E) ? Magnitude from E plate recalibrated to r (8) 939-942 F4.1 mag g(J) ? Magnitude from J plate recalibrated to g (8) 944-947 F4.1 mag r(F) ? Magnitude from F plate recalibrated to r (8) 949-952 F4.1 mag i(N) ? Magnitude from N plate recalibrated to i (8) 953 A1 --- --- [|]
Note (1): the type (class) is numbered as follows: 0 = Unknown: Object type is not known. 1 = Cosmic-ray track (not used). 2 = Defect (not used) 3 = Galaxy: An extended object composed of many stars and other matter. 4 = Ghost: Object created by reflected or refracted light. (not used) 5 = KnownObject: Object came from some other catalog (not yet used) 6 = Star: A a self-luminous gaseous celestial body. 7 = Trail: A satellite or asteroid or meteor trail. (not yet used) 8 = Sky: Blank sky spectrogram (no objects in this arcsecond area). 9 = NotAType Note (2): the SDSS identifier is composed of the 5 numbers run, rerun (301), camcol (1-6), field (11-1001) and object (1-4000). The SDSS-ID is written run-rerun-cam-field-obj (5 numbers and 4 dashes). The objID is also combined from these numbers (the n operator represents the left shift of n bits, i.e. a multiplication by 2n): objID = skyVersion59 + rerun48 + run32 + camcol29 + field16 + obj (in the case of DR8, skyVersion=2 and rerun=301, i.e. objID is in the range 1237645472596754432-1237926947573465087 (hexa 112d000000000000-112dffffffffffff). Note (3): flags written in hexadecimal, full description available at http://skyserver.sdss3.org/dr8/en/help/browser/enum.asp?n=PhotoFlags ------------------------------------------------------------------------------ 0000000000000001 = CANONICAL_CENTER Measurements used the center in r* 0000000000000002 = BRIGHT Object detected in bright object-finding 0000000000000004 = EDGE Object is too close to edge of frame 0000000000000008 = BLENDED Multiple peaks detected 0000000000000010 = CHILD Product of deblending a BLENDED object. 0000000000000020 = PEAKCENTER Position of peak pixel rather than ML 0000000000000040 = NODEBLEND No deblending attempted on BLENDED object 0000000000000080 = NOPROFILE Radial profile could not be estimated 0000000000000100 = NOPETRO No valid Petrosian radius found 0000000000000200 = MANYPETRO More than one Petrosian radius found. 0000000000000400 = NOPETRO_BIG Petrosian radius beyond radial profile. 0000000000000800 = DEBLENDTOOMANY_PEAKS More than 25 peaks in this object 0000000000001000 = COSMIC_RAY Contains a pixel part of a cosmic ray. 0000000000002000 = MANYR50 More than one 50% light radius. 0000000000004000 = MANYR90 More than one 90% light radius. 0000000000008000 = BAD_RADIAL Some points in radial profile S/N<0 0000000000010000 = INCOMPLETE_PROFILE Petrosian radius intersects frame edge 0000000000020000 = INTERP Pixel(s) determined by interpolation. 0000000000040000 = SATURATED Saturated pixel(s) 0000000000080000 = NOTCHECKED Not checked for local peaks 0000000000100000 = SUBTRACTED BRIGHT object, wings subtracted 0000000000200000 = NOSTOKES No measured Stokes params 0000000000400000 = BADSKY Sky level so bad that highest pixel <0. 0000000000800000 = PETROFAINT Petrosian radius(es) rejected for low SB 0000000001000000 = TOO_LARGE Object too large to measure its profile 0000000002000000 = DEBLENDEDASPSF Deblender treated obj as PSF 0000000004000000 = DEBLEND_PRUNED At least one child was removed 0000000008000000 = ELLIPFAINT Object center fainter than the isophote 0000000010000000 = BINNED1 Object detected in 1x1 binned image 0000000020000000 = BINNED2 Object detected in 2x2 binned image 0000000040000000 = BINNED4 Object detected in 4x4 binned image 0000000080000000 = MOVED Possibly moving object 0000000100000000 = DEBLENDEDASMOVING A MOVED object treated as moving. 0000000200000000 = NODEBLEND_MOVING A MOVED object not treated as moving. 0000000400000000 = TOOFEWDETECTIONS Too few detections to deblend as moving. 0000000800000000 = BADMOVINGFIT Moving fit too poor to be believable. 0000001000000000 = STATIONARY Object consistent with being stationary. 0000002000000000 = PEAKSTOOCLOSE Some peaks merged into a single peak. 0000004000000000 = MEDIAN_CENTER Center given is of median-smoothed image. 0000008000000000 = LOCAL_EDGE Center too close to an edge. 0000010000000000 = BADCOUNTSERROR Too few good pixels, error underestimated 0000020000000000 = BADMOVINGFIT_CHILD Moving child's velocity fit too poor 0000040000000000 = DEBLENDUNASSIGNEDFLUX After deblending flux not assigned 0000080000000000 = SATUR_CENTER Center is close to saturated pixel(s) 0000100000000000 = INTERP_CENTER Center is close to interpolated pixel(s) 0000200000000000 = DEBLENDEDATEDGE Object close to edge was deblended 0000400000000000 = DEBLEND_NOPEAK No detected peak within this child 0000800000000000 = PSFFLUXINTERP PSF flux from interpolated pixels > 20% 0001000000000000 = TOOFEWGOOD_DETECTIONS Too few good detections 0002000000000000 = CENTEROFFAIMAGE At least one peak's center lay off image 0004000000000000 = DEBLEND_DEGENERATE Identical candidate children, 1 retained 0008000000000000 = BRIGHTESTGALAXYCHILD Brightest member classified as galaxy 0010000000000000 = CANONICAL_BAND Band chosen as 'Canonical', generally r 0020000000000000 = AMOMENT_FAINT Object too faint to measure moments 0040000000000000 = AMOMENT_SHIFT Centroid shift too large 0080000000000000 = AMOMENT_MAXITER Maximum number of iterations exceeded 0100000000000000 = MAYBE_CR Object could actually be a cosmic ray 0200000000000000 = MAYBE_EGHOST Object could actually be a ghost 0400000000000000 = NOTCHECKED_CENTER Object center in a region not searched 0800000000000000 = OBJECT2HASSATUR_DN Trails included in estimated flux. 1000000000000020 = OBJECT2DEBLENDPEEPHOLE Deblend modified by peephole 2000000000000020 = GROWN_MERGED Growing led to a merger 4000000000000020 = HAS_CENTER Object has a canonical center 8000000000000020 = RESERVED Not used ------------------------------------------------------------------------------- Note (4): status flags written in hexadecimal, full description available at http://skyserver.sdss3.org/dr8/en/help/browser/enum.asp?n=ResolveStatus ------------------------------------------------------------------------------- 00000001 = RUN_PRIMARY Object status set in reference to its own run 00000002 = RUN_RAMP Object in what would be the overlap area of a field 00000004 = RUN_OVERLAPONLY Object only appears in the overlap between 2 fields 00000008 = RUN_IGNORE Bright or parent object that should be ignored 00000010 = RUN_EDGE Object near lowest or highest column 00000020 = RUN_DUPLICATE Duplicate measurements of same pixels in 2 fields 00000100 = SURVEY_PRIMARY Primary observation within survey (mode=1) 00000200 = SURVEY_BEST Best observation in full survey, but not primary. 00000400 = SURVEY_SECONDARY Repeat (independent) observation (mode=2) 00000800 = SURVEY_BADFIELD In field with score=0 00001000 = SURVEY_EDGE Not kept as secondary ------------------------------------------------------------------------------ Note (5): The response curves of the SDSS filters (u g r i z) can be found on the SDSS pages: http://www.sdss.org/dr5/instruments/imager/index.html The central wavelength and FWHM are: ----------------------------------------------- (nm) u' g' r' i' z' ----------------------------------------------- lambda 354.3 477.0 623.1 762.5 913.4 FWHM 56.7 138.7 137.3 152.6 95.0 ----------------------------------------------- Note that the ugriz magnitudes are not exactly on the AB scale for the u-band (uAB=umag-0.04) and z-band (zAB=zmag+0.02) (http://www.sdss.org/DR7/algorithms/fluxcal.html) Note (6): column from the "Fields" table. Dates of the observations for each colour, and their average. Note (7): column from the "SpecObjAll" table. The "SpObjID" is composed of plate + mjd + fiber + run2d with formula (the n operator represents the left shift of n bits, i.e. a multiplication by 2n): SpObjID = (plate50)+((mjd-50000)24)+(fiber38)+(run2d10) Note (8): column from the "ProperMotions" table.
Acknowledgements: It is a pleasure to thank Aniruddha R. Thakar, who prepared the huge files to build this catalog.
(End) Francois Ochsenbein [CDS] 28-Sep-2011
| 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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