J/ApJS/193/13 Spitzer/IRAC sources in the EGS I. SEDs (Barro+, 2011)
UV-to-FIR analysis of Spitzer/IRAC sources in the Extended Groth Strip.
I. Multi-wavelength photometry and spectral energy distributions.
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, 13 (2011)>
=2011ApJS..193...13B 2011ApJS..193...13B
ADC_Keywords: Galaxies, photometry ; Photometry, ugriz ; Photometry, infrared ;
Photometry, ultraviolet ; X-ray sources ; Photometry, UBVRI
Keywords: galaxies: high-redshift - galaxies: photometry - galaxies: starburst -
infrared: galaxies
Abstract:
We present an IRAC 3.6+4.5um selected catalog in the Extended Groth
Strip (EGS) containing photometry from the ultraviolet to the
far-infrared and stellar parameters derived from the analysis of the
multi-wavelength data. In this paper, we describe the method used to
build coherent spectral energy distributions (SEDs) for all the
sources. In a forthcoming companion paper, we analyze those SEDs to
obtain robust estimations of stellar parameters such as photometric
redshifts, stellar masses, and star formation rates. The catalog
comprises 76936 sources with [3.6]≤23.75mag (85% completeness level
of the IRAC survey in the EGS) over 0.48deg2. For approximately 16%
of this sample, we are able to deconvolve the IRAC data to obtain
robust fluxes for the multiple counterparts found in ground-based
optical images. Typically, the SEDs of the IRAC sources in our catalog
count with more than 15 photometric data points, spanning from the
ultraviolet wavelengths probed by GALEX to the far-infrared observed
by Spitzer, and going through ground- and space-based optical and
near-infrared data taken with 2-8m class telescopes. Approximately 95%
and 90% of all IRAC sources are detected in the deepest optical and
near-infrared bands. These fractions are reduced to 85% and 70% for
S/N>5 detections in each band. Only 10% of the sources in the catalog
have optical spectroscopy and redshift estimations. Almost 20% and 2%
of the sources are detected by MIPS at 24 and 70um, respectively. We
also cross-correlate our catalog with public X-ray and radio catalogs.
Description:
Table 1 summarizes the main characteristics of the multi-wavelength
data sets in EGS (RA=14:17,DE=+52:30) compiled for this paper to
characterize the IRAC-selected sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 130 34 Properties of the data set in the EGS
table5.dat 760 76936 The IRAC-3.6+4.5 micron sample: multi-band
photometry
table6.dat 49 76936 The IRAC-3.6+4.5 micron sample: photometric
properties
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See also:
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/MNRAS/382/109 : Massive galaxies in Extended Groth Strip (Trujillo+, 2007)
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)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Band Name of the observing band
23 A1 --- f_Band [a] a: data drawn from a catalog
25- 30 F6.2 --- lambda ? Effective wavelength (1)
32- 34 A3 --- x_lambda lambda unit
35 A1 --- f_lambda [b] b: 640-910nm range
37- 54 A18 --- mLim Limiting AB magnitude (2)
56- 60 A5 arcsec FWHM Median FWHM of the PSF measured in a large
number of stars (see Section 5.4)
62- 67 F6.4 deg2 Area Area covered by the observations
69- 75 F7.3 10+3deg-2 Dens Source density per square degree up to the
limiting magnitude (mLim)
77-130 A54 --- Source Source from where the data were obtained
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Note (1): λeff of the filter calculated by convolving the Vega
spectrum (Colina & Bohlin, 1994AJ....108.1931C 1994AJ....108.1931C) with the transmission
curve of the filter+detector.
Note (2): Limiting AB magnitude (except for the X-ray catalogs) of the
image estimated as the magnitude of an S/N=5 detection (see Section 4
for details on the measurement of the photometric errors).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [irac]
5- 12 A8 --- [BPG2011] Object name (1)
14- 25 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000)
27- 37 F11.8 deg DEdeg Declination in decimal degrees (J2000)
39- 46 F8.6 --- zsp ?=0 Spectroscopic redshift (2)
48 I1 --- q_zsp ?=0 Quality flag on zsp (3)
50- 54 F5.1 nm FUVw [153.9] GALEX FUV band effective wavelength
56- 60 F5.1 nm NUVw [231.6] GALEX NUV band effective wavelength
62- 66 F5.1 nm u'w [362.6] MMT u' band effective wavelength
68- 72 F5.1 nm u*w [381.1] CFHTLS u* band effective wavelength
74- 78 F5.1 nm Bw [439.0] CFHT12k B band effective wavelength
80- 84 F5.1 nm gw [481.4] MMT g band effective wavelength
86- 90 F5.1 nm g'w [486.3] CFHTLS g' band effective wavelength
92- 96 F5.1 nm V606w [592.4] HST/ACS V606 effective wavelength
98-102 F5.1 nm r'w [625.8] CFHTLS r' band effective wavelength
104-108 F5.1 nm Rw [651.8] CFHT12k R band effective wavelength
110-114 F5.1 nm S-Rw [660.0] Subaru/CFH R band effective wavelength
116-120 F5.1 nm i'w [769.0] CFHTLS i' band effective wavelength
122-126 F5.1 nm iw [781.5] MMT i band effective wavelength
128-132 F5.1 nm i814w [807.3] HST/ACS I814 effective wavelength
134-138 F5.1 nm Iw [813.3] CFHT12k I band effective wavelength
140-144 F5.1 nm z'w [887.1] CFHTLS z' band effective wavelength
146-150 F5.1 nm zw [907.0] MMT z band effective wavelength
152-157 F6.1 nm J110w [1103.3] HST/NICMOS J110 effective wavelength
159-164 F6.1 nm H160w [1593.2] HST/NICMOS H160 effective wavelength
166-171 F6.1 nm CAHAJw [1209.4] CAHA J band effective wavelength
173-178 F6.1 nm WIRCJw [1235.5] WIRC J band effective wavelength
180-185 F6.1 nm CAHAKw [2114.6] CAHA Ks band effective wavelength
187-192 F6.1 nm WIRCKw [2145.3] WIRC K band effective wavelength
194-199 F6.1 nm Ksw [2161.3] MOIRCS Ks band effective wavelength
201-206 F6.1 nm 3.6w [3561.2] Spitzer/IRAC 3.6 micron band
effective wavelength
208-213 F6.1 nm 4.5w [4509.6] Spitzer/IRAC 4.5 micron band
effective wavelength
215-220 F6.1 nm 5.8w [5689.4] Spitzer/IRAC 5.8 micron band
effective wavelength
222-227 F6.1 nm 8.0w [7957.6] Spitzer/IRAC 8.0 micron band
effective wavelength
229-235 F7.1 nm 24w [23844.0] Spitzer/MIPS 24 micron band
effective wavelength
237-243 F7.1 nm 70w [72493.7] Spitzer/MIPS 70 micron band
effective wavelength
245-251 F7.3 mag FUVmag ?=-99 GALEX FUV (153.9nm) AB magnitude (4)
253-259 F7.3 mag NUVmag ?=-99 GALEX NUV (231.6nm) AB magnitude (4)
261-267 F7.3 mag u'mag ?=-99 MMT u' (362.6nm) AB magnitude (4)
269-275 F7.3 mag u*mag ?=-99 CFHTLS u* (381.1nm) AB magnitude (4)
277-283 F7.3 mag Bmag ?=-99 CFHT12k B (439nm) AB magnitude (4)
285-291 F7.3 mag gmag ?=-99 MMT g (481.4nm) AB magnitude (4)
293-299 F7.3 mag g'mag ?=-99 CFHTLS g' (486.3nm) AB magnitude (4)
301-307 F7.3 mag V606mag ?=-99 HST/ACS F606W (592.4nm) AB magnitude (4)
309-315 F7.3 mag r'mag ?=-99 CFHTLS r' (625.8nm) AB magnitude (4)
317-323 F7.3 mag Rmag ?=-99 CFHT12k R (651.8nm) AB magnitude (4)
325-331 F7.3 mag S-Rmag ?=-99 Subaru/CFH R (660nm) AB magnitude (4)
333-339 F7.3 mag i'mag ?=-99 CFHTLS i' (769nm) AB magnitude (4)
341-347 F7.3 mag imag ?=-99 MMT i (781.5nm) AB magnitude (4)
349-355 F7.3 mag i814mag ?=-99 HST/ACS F814W (807.3nm) AB magnitude (4)
357-363 F7.3 mag Imag ?=-99 CFHT12k I (813.3nm) AB magnitude (4)
365-371 F7.3 mag z'mag ?=-99 CFHTLS z' (887.1nm) AB magnitude (4)
373-379 F7.3 mag zmag ?=-99 MMT z (907nm) AB magnitude (4)
381-387 F7.3 mag J110mag ?=-99 HST/NICMOS F110W (1103np) AB magnitude(4)
389-395 F7.3 mag H160mag ?=-99 HST/NICMOS F160W (1593nm) AB magnitude(4)
397-403 F7.3 mag CAHAJmag ?=-99 CAHA J (1209nm) AB magnitude (4)
405-411 F7.3 mag WIRCJmag ?=-99 WIRC J (1235nm) AB magnitude (4)
413-419 F7.3 mag CAHAKmag ?=-99 CAHA Ks (2115nm) AB magnitude (4)
421-427 F7.3 mag WIRCKmag ?=-99 WIRC K (2145nm) AB magnitude (4)
429-435 F7.3 mag Ksmag ?=-99 MOIRCS Ks (2161nm) AB magnitude (4)
437-442 F6.3 mag 3.6mag ?=-99 Spitzer/IRAC 3.6 micron (3.5612um) AB
magnitude (4)
444-450 F7.3 mag 4.5mag ?=-99 Spitzer/IRAC 4.5 micron (4.5096um) AB
magnitude (4)
452-458 F7.3 mag 5.8mag ?=-99 Spitzer/IRAC 5.8 micron (5.6894um) AB
magnitude (4)
460-466 F7.3 mag 8.0mag ?=-99 Spitzer/IRAC 8.0 micron (7.9576um) AB
magnitude (4)
468-474 F7.3 mag 24mag ?=-99 Spitzer/MIPS 24 micron (23.844um) AB
magnitude (4)
476-482 F7.3 mag 70mag ?=-99 Spitzer/MIPS 70 micron (72.4937um) AB
magnitude (4)
484 A1 --- f_FUVmag [-] -: Forced photometric detection
485-493 F9.3 mag e_FUVmag ?=0 Uncertainty in FUVmag (4)
495 A1 --- f_NUVmag [-] -: Forced photometric detection
496-504 F9.3 mag e_NUVmag ?=0 Uncertainty in NUVmag (4)
506 A1 --- f_u'mag [-] -: Forced photometric detection
507-515 F9.3 mag e_u'mag ?=0 Uncertainty in u'mag (4)
517 A1 --- f_u*mag [-] -: Forced photometric detection
518-524 F7.3 mag e_u*mag ?=0 Uncertainty in u*mag (4)
526 A1 --- f_Bmag [-] -: Forced photometric detection
527-534 F8.3 mag e_Bmag ?=0 Uncertainty in Bmag (4)
536 A1 --- f_gmag [-] -: Forced photometric detection
537-543 F7.3 mag e_gmag ?=0 Uncertainty in gmag (4)
545 A1 --- f_g'mag [-] -: Forced photometric detection
546-553 F8.3 mag e_g'mag ?=0 Uncertainty in g'mag (4)
555 A1 --- f_V606mag [-] -: Forced photometric detection
556-562 F7.3 mag e_V606mag ?=0 Uncertainty in V606mag (4)
564 A1 --- f_r'mag [-] -: Forced photometric detection
565-573 F9.3 mag e_r'mag ?=0 Uncertainty in r'mag (4)
575 A1 --- f_Rmag [-] -: Forced photometric detection
576-582 F7.3 mag e_Rmag ?=0 Uncertainty in Rmag (4)
584 A1 --- f_S-Rmag [-] -: Forced photometric detection
585-592 F8.3 mag e_S-Rmag ?=0 Uncertainty in S-Rmag (4)
594 A1 --- f_i'mag [-] -: Forced photometric detection
595-601 F7.3 mag e_i'mag ?=0 Uncertainty in i'mag (4)
603 A1 --- f_imag [-] -: Forced photometric detection
604-610 F7.3 mag e_imag ?=0 Uncertainty in imag (4)
612 A1 --- f_i814mag [-] -: Forced photometric detection
613-619 F7.3 mag e_i814mag ?=0 Uncertainty in i814mag (4)
621 A1 --- f_Imag [-] -: Forced photometric detection
622-629 F8.3 mag e_Imag ?=0 Uncertainty in Imag (4)
631 A1 --- f_z'mag [-] -: Forced photometric detection
632-640 F9.3 mag e_z'mag ?=0 Uncertainty in z'mag (4)
642 A1 --- f_zmag [-] -: Forced photometric detection
643-650 F8.3 mag e_zmag ?=0 Uncertainty in zmag (4)
652 A1 --- f_J110mag [-] -: Forced photometric detection
653-659 F7.3 mag e_J110mag ?=0 Uncertainty in J110mag (4)
661 A1 --- f_H160mag [-] -: Forced photometric detection
662-667 F6.3 mag e_H160mag ?=0 Uncertainty in H160mag (4)
669 A1 --- f_CAHAJmag [-] -: Forced photometric detection
670-677 F8.3 mag e_CAHAJmag ?=0 Uncertainty in CAHAJmag (4)
679-685 F7.3 mag e_WIRCJmag ?=0 Uncertainty in WIRCJmag (4)
687 A1 --- f_CAHAKmag [-] -: Forced photometric detection
688-695 F8.3 mag e_CAHAKmag ?=0 Uncertainty in CAHAKmag (4)
697 A1 --- f_WIRCKmag [-] -: Forced photometric detection
698-705 F8.3 mag e_WIRCKmag ?=0 Uncertainty in WIRCKmag (4)
707 A1 --- f_Ksmag [-] -: Forced photometric detection
708-713 F6.3 mag e_Ksmag ?=0 Uncertainty in Ksmag (4)
715-719 F5.3 mag e_3.6mag ?=0 Uncertainty in 3.6mag (4)
721 A1 --- f_4.5mag [-] -: Forced photometric detection
722-728 F7.3 mag e_4.5mag ?=0 Uncertainty in 4.5mag (4)
730 A1 --- f_5.8mag [-] -: Forced photometric detection
731-738 F8.3 mag e_5.8mag ?=0 Uncertainty in 5.8mag (4)
740 A1 --- f_8.0mag [-] -: Forced photometric detection
741-748 F8.3 mag e_8.0mag ?=0 Uncertainty in 8.0mag (4)
750-754 F5.3 mag e_24mag ?=0 Uncertainty in 24mag (4)
756-760 F5.3 mag e_70mag ?=0 Uncertainty in 70mag (4)
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Note (1): Unique identifier in the catalog. Catalog sorted by this field.
Note (2): Drawn from Davis et al. (2007ApJ...660L...1D 2007ApJ...660L...1D; ∼8000 galaxies) and
Steidel et al. (2003, Cat. J/ApJ/592/728; LBGs at z≳3).
Note (3): Only redshifts with q_z>2 have been used in the analysis.
The values are as follows:
4 = >99.5%;
3 = >90%;
2 = uncertain;
1 = bad quality.
Note (4): Observed magnitudes with the associated uncertainty as measured
in the apertured matched procedure (see Section 4). Negative values
of the photometric uncertainty are for forced photometric detections.
Magnitudes >0 with uncertainty equal to 0.00 are non-detections; for
these bands the photometry indicates the magnitude of σsky
(see Section 4.2).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [irac]
5- 12 A8 --- [BPG2011] Object name (1)
14- 25 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000)
27- 37 F11.8 deg DEdeg Declination in decimal degrees (J2000)
39- 40 I2 --- Ndet [1/26] Number of optical-to-NIR (0.3-8um) bands
where object is detected
42- 43 I2 --- Nnot [0/20] Number of optical-to-NIR (0.3-8um) bands
where object is a priori undetected
(forced photometry recovers a valid flux)
45 I1 --- Q [0/5] Quality flag (6)
47 I1 --- St [0/8] Sum of all the stellarity criteria
satisfied (5)
49 I1 --- Reg [0/1] Main (0) or Flanking (1) region of the
field where the source is located
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Note (1): Unique identifier in the catalog. Catalog sorted by this field.
Note (5):
Following Perez-Gonzalez, 2008 (Cat. J/ApJ/675/234), we used eight
different photometric and morphological criteria to identify stars
in the merged photometric catalog (a source is classified as a star
for Stell>2, see section 5.4 for further details). The criteria are:
1 = the average of SExtractor star/galaxy separation parameter (stellarity)
for all bands where the source is detected;
2 = when available, the stellarity parameter and FWHM of the source in the
HST images are also considered as an independent, more reliable,
criterion;
3,4 = the IRAC-based color-magnitude criteria of Eisenhardt et al.
(2004ApJS..154...48E 2004ApJS..154...48E) and Barmby et al. (2004ApJS..154...97B 2004ApJS..154...97B);
5 = the concentration parameter (i.e., the difference of the [3.6]mag
measured in a 3" radius aperture and the SExtractor MagAuto);
6 = the color-color criteria of Eisenhardt et al. (2004ApJS..154...48E 2004ApJS..154...48E)
7 = color-magnitude criteria of Eisenhardt et al. (2004ApJS..154...48E 2004ApJS..154...48E; this
time based on optical and NIR bands);
8 = the BzK criteria of Daddi et al. (2004ApJ...617..746D 2004ApJ...617..746D).
Note (6): Indicating the proximity of a very bright source in the vicinity
of the source. Sources detected in very few bands (N(band)<5) and
located nearby a bright source are likely to be spurious detections
(see Section 6.2). The values are:
0 = source unflagged
1 = source within 10" of a source with [3.6mag] in range 17-18
2 = source within 15" of a source with [3.6mag] in range 17-18
3 = source within 20" of a source with [3.6mag] in range 15-16
4 = source within 30" of a source with [3.6mag]<15
5 = source within 70-100" of a saturated source
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Apr-2011