J/ApJS/193/30 UV-to-FIR analysis of sources in the EGS. II. (Barro+, 2011)
UV-to-FIR analysis of Spitzer/IRAC sources in the Extended Groth Strip. II. Photometric redshifts, stellar masses, and star formation rates. Barro G., Perez-Gonzalez P.G., Gallego J., Ashby M.L.N., Kajisawa M., Miyazaki S., Villar V., Yamada T., Zamorano J. <Astrophys. J. Suppl. Ser., 193, 30 (2011)> =2011ApJS..193...30B
ADC_Keywords: Redshifts ; Galaxies, IR ; Models Keywords: galaxies: high-redshift - galaxies: photometry - galaxies: starburst - infrared: galaxies Abstract: Based on the ultraviolet to far-infrared photometry already compiled and presented in a companion paper (Barro et al. 2011, Cat. J/ApJS/193/13), we present a detailed spectral energy distribution (SED) analysis of nearly 80000 IRAC 3.6+4.5um selected galaxies in the Extended Groth Strip. We estimate photometric redshifts, stellar masses, and star formation rates (SFRs) separately for each galaxy in this large sample. The catalog includes 76936 sources with [3.6]≤23.75 (85% completeness level of the IRAC survey) over 0.48deg2. The typical photometric redshift accuracy is Δz/(1+z)=0.034, with a catastrophic outlier fraction of just 2%. We quantify the systematics introduced by the use of different stellar population synthesis libraries and initial mass functions in the calculation of stellar masses. We find systematic offsets ranging from 0.1 to 0.4dex, with a typical scatter of 0.3dex. We also provide UV- and IR-based SFRs for all sample galaxies, based on several sets of dust emission templates and SFR indicators. We evaluate the systematic differences and goodness of the different SFR estimations using the deep FIDEL 70um data available in the Extended Groth Strip. Typical random uncertainties of the IR-bases SFRs are a factor of two, with non-negligible systematic effects at z≳1.5 observed when only MIPS 24um data are available. Description: The present work is based on the multi-wavelength catalog of IRAC 3.6+4.5um selected galaxies in the EGS (RA=14h14m, DEC=+53°30') presented in Paper I (Barro et al. 2011, Cat. J/ApJS/193/13). We cross-correlated our IRAC-selected catalog with the X-ray (Chandra) and radio (VLA/20cm) catalogs of Laird et al. (2009, Cat. J/ApJS/180/102) and Ivison et al. (2007ApJ...660L..77I), and with all the spectroscopic redshifts from DEEP2 DR3 and a small sample of 238 spectroscopically confirmed Lyman break galaxies (LBGs) from Steidel et al. (2003, Cat. J/ApJ/592/728). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 87 76936 The IRAC-3.6+4.5um sample: Photometric redshifts table8.dat 139 76936 The IRAC-3.6+4.5um sample: stellar mass estimates table9.dat 169 76936 The IRAC-3.6+4.5um sample: IR-luminosities and star formation rate estimates
See also: J/ApJS/193/13 : Spitzer/IRAC sources in the EGS I. SEDs (Barro+, 2011) J/A+A/526/A72 : Early-type galaxies in the EGS (Fernandez Lorenzo+, 2011) J/ApJS/180/102 : AEGIS-X: Chandra deep survey (Laird+, 2009) J/ApJ/675/234 : Stellar mass functions for galaxies 0<z<4 (Perez-Gonzalez+, 2008) J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008) J/AJ/132/2159 : IRAC counterparts of 6cm galaxies in EGS (Willner+, 2006) J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003) http://irsa.ipac.caltech.edu/data/SPITZER/FIDEL/ : FIDEL data online http://deep.berkeley.edu/DR3/dr3.primer.html : DEEP2 DR3 data products Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [irac] 5- 12 A8 --- [BPG2011] Unique object identifier 14- 25 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 37 F11.8 deg DEdeg Declination in decimal degrees (J2000) 39- 43 F5.2 --- zph Probability weighted photometric redshift (1) 45- 50 F6.2 --- zEAZY ?=-99 EAZY photometric redshift (2) 52- 57 F6.2 --- zI06 ?=-99 Ilbert et al. (2006A&A...457..841I) photometric redshift (3) 59- 65 F7.5 --- zsp ?=0.00000 Spectroscopic redshift (4) 67 I1 --- q_zsp [0/4] Quality flag on zsp, 4=best (5) 69- 72 F4.2 --- e_zph Uncertainty in photometric redshift zph 74- 82 F9.2 --- q_zEAZY ?=-99 Reliability parameter for ZEAZY (6) 84- 85 I2 --- o_zph Number of different bands used to derive zph with Rainbow software 87 I1 --- St Sum of the stellarity criteria satisfied (7)
Note (1): This is our default value of photometric redshift for SED fitting based estimates. Note (2): With the code EAZY (Brammer et al. 2008ApJ...686.1503B) using the default template configuration and the K-band luminosity prior applied to the [3.6] band. The input photometric catalog is the same as for the other redshifts. Note (3): From the (5-band) i' selected catalog of the CFHTLS. This catalog overlaps with the IRAC sample in the central portion of the mosaic (52.16°<δ<53.20° & 214.04°<α<215.74°). Note (4): Determination drawn from DEEP2 (Davis et al. 2007ApJ...660L...1D; ∼8000 galaxies) and (Steidel et al. 2003, Cat. J/ApJ/592/728; LBGs at z≳3). Note (5): Only redshifts with q_zsp>2 have been used in the analysis. Quality code as follows: 4 = > 99.5%; 3 = > 90%; 2 = uncertain; 1 = bad quality. 0 = no spectroscopic redshift Note (6): Estimated from the 1σ width of the probability distribution function. Note (7): See Section 5.4 of Paper I (Barro et al. Cat. J/ApJS/193/13). A source is classified as star for Stellarity >2.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [irac] 5- 12 A8 --- [BPG2011] Unique object identifier 14- 25 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 37 F11.8 deg DEdeg Declination in decimal degrees (J2000) 39- 43 F5.2 [Msun] Mass Log of stellar mass using z_best_ (8) 45- 49 F5.2 [Msun] Mzsp Log of stellar mass using z_spec_ (9) 51- 55 F5.2 [Msun] zM Redshift used in mass fitting procedures (10) 57- 61 F5.2 [Msun] MP01-K Log of P01,KROU stellar mass (11) 63- 67 F5.2 [Msun] MBC03-C Log of BC03,CHAB stellar mass (11) 69- 73 F5.2 [Msun] MM05-K Log of M05,KROU stellar mass (11) 75- 79 F5.2 [Msun] MCB09-C Log of CB09,CHAB stellar mass (11) 81- 85 F5.2 [Msun] MCB09-S Log of CB09,SALP stellar mass (11) 87- 91 F5.2 [Msun] MP01-C Log of P01,CF00 stellar mass (11) 93- 97 F5.2 [Msun] e_Mass Uncertainty in Mass 99-103 F5.2 [Msun] e_Mzsp Uncertainty in Mzsp 105-109 F5.2 [Msun] e_MP01-K Uncertainty in MP01-K 111-115 F5.2 [Msun] e_MBC03-C Uncertainty in MBC03-C 117-121 F5.2 [Msun] e_MM05-K Uncertainty in MM05-K 123-127 F5.2 [Msun] e_MCB09-C Uncertainty in MCB09-C 129-133 F5.2 [Msun] e_MCB09-S Uncertainty in MCB09-S 135-139 F5.2 [Msun] e_MP01-C Uncertainty in MP01-C
Note (8): Estimated with our default modeling parameters, [P01,SALP,CAL01], and zphot-best. Note (9): Estimated with our default modeling parameters, [P01,SALP,CAL01], forcing the photometric redshift to the spectroscopic value, when available. Note (10): Used in the fitting procedure of columns MP01-K through MP01-C. This redshift refer to zphot-best unless the spectroscopic redshift is available; in that case the redshift is forced to the spectroscopic value. Note (11): Where P01, BC03, M05, and CB09 are the PEGASE 2.0, Fioc & Rocca-Volmerange (P01, 1997A&A...326..950F), Bruzual & Charlot (2003MNRAS.344.1000B), Maraston (2005MNRAS.362..799M), and Charlot & Bruzual (CB09, 2011, in preparation) stellar population synthesis models, respectively. SALP, KROU and CHAB are the Salpeter (1955ApJ...121..161S), Kroupa (2001MNRAS.322..231K), and Chabrier (2003PASP..115..763C) IMF laws, respectively, CAL01 is the extinction law of Calzetti et al. (2000ApJ...533..682C), CF00 is the Charlot & Fall (2000ApJ...539..718C) dust extinction law.
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [irac] 5- 12 A8 --- [BPG2011] Unique object identifier 14- 25 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 37 F11.8 deg DEdeg Declination in decimal degrees (J2000) 39- 43 F5.2 --- zSF Redshift used in fitting procedure (10) 45- 49 I5 uJy F24 ? Spitzer/MIPS 24 micron band flux density 51- 53 I3 uJy e_F24 ? Uncertainty in F24 55- 60 I6 uJy F70 ? Spitzer/MIPS 70 micron band flux density 62- 66 I5 uJy e_F70 ? Uncertainty in F70 68- 76 F9.1 Msun/yr SFR0.28 UV based SFR from the monochromatic luminosity at 2800Å (280nm) (12) 78- 86 F9.1 Msun/yr SFRR09 IR based SFR from MIPS 24um flux (13) 88- 93 F6.2 [Lsun] L24 Log of total IR luminosity (14) 95-102 F8.1 Msun/yr SFR24 SFR from L24 and Kennicutt 1998 calibration 104-111 F8.1 Msun/yr SFRCE01 SFR from L24 and CE01 models (15) 113-119 F7.1 Msun/yr SFRB08 SFR from L24 and B08 relation (16) 121-128 F8.1 Msun/yr SFRAH06 SFR from L24 and AH06 relation (17) 130-135 F6.2 [Lsun] Lb ? Log of total IR luminosity (18) 137-144 F8.1 Msun/yr SFRb ? SFR from Lb and Kennicutt (1998ARA&A..36..189K) calibration 146-153 F8.1 Msun/yr SFRCE01b ? SFR from Lb and CE01 models (15) 155-161 F7.1 Msun/yr SFRB08b ? SFR from Lb and B08 relationship (16) 163-169 F7.1 Msun/yr SFRAH06b ? SFR from Lband AH06 relation (17)
Note (10): This redshift refer to zphot-best unless the spectroscopic redshift is available; in that case the redshift is forced to the spectroscopic value. Note (12): Estimated from the monochromatic luminosity at 2800Å (280nm) rest-frame using the calibration of Kennicutt (1998ARA&A..36..189K). We also refer to this value as SFRUV,obs. Note (13): Estimated from the observed flux in MIPS 24 micron and the redshift using the formula of Rieke et al. (2009, Cat. J/ApJ/692/556). Note (14): Obtained integrating (from 8-1000 microns) the average of the best fitting templates. Computed from the fit of MIPS 24 micron data to the models of Chary & Elbaz (CE01, 2001ApJ...556..562C), Dale & Helou (DH02, 2002ApJ...576..159D). Note (15): In this case the IR SED is fitted only with the models of CE01 (Chary & Elbaz, 2001ApJ...556..562C). Note (16): Estimated from the monochromatic luminosity at 8 micron rest-frame using the relation of Bavouzet et al. (2008A&A...479...83B). Note (17): Estimated from the monochromatic luminosity at 24 micron rest-frame using the relation of Alonso-Herrero et al. (2006ApJ...650..835A). Note (18): Obtained integrating (from 8-1000 microns) the average of the best fitting templates. Computed from the fit of IRAC-8.0 and MIPS 24 and 70 microns (best effort) data to the models of Chary & Elbaz (CE01, 2001ApJ...556..562C) Dale & Helou (DH02, 2002ApJ...576..159D) and Rieke et al. (2009, Cat. J/ApJ/692/556).
History: From electronic version of the journal References: Barro et al. Paper I. 2011ApJS..193...13B Cat. J/ApJS/193/13
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-May-2011
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