J/ApJS/218/33 Spitzer-CANDELS catalog within 5 deep fields (Ashby+, 2015)
S-CANDELS: the Spitzer-Cosmic Assembly Near-infrared Deep Extragalactic Survey.
Survey design, photometry, and deep IRAC source counts.
Ashby M.L.N., Willner S.P., Fazio G.G., Dunlop J.S., Egami E., Faber S.M.,
Ferguson H.C., Grogin N.A., Hora J.L., Huang J.-S., Koekemoer A.M.,
Labbe I., Wang Z.
<Astrophys. J. Suppl. Ser., 218, 33 (2015)>
=2015ApJS..218...33A 2015ApJS..218...33A
ADC_Keywords: Galaxies, IR ; Photometry, infrared ; Surveys
Keywords: galaxies: high-redshift; infrared: galaxies; surveys
Abstract:
The Spitzer-Cosmic Assembly Near-infrared Deep Extragalactic Legacy
Survey (S-CANDELS; PI G.Fazio) is a Cycle 8 Exploration Program
designed to detect galaxies at very high redshifts (z>5). To mitigate
the effects of cosmic variance and also to take advantage of deep
coextensive coverage in multiple bands by the Hubble Space Telescope
(HST) Multi-cycle Treasury Program CANDELS, S-CANDELS was carried out
within five widely separated extragalactic fields: the UKIDSS
Ultra-deep Survey, the Extended Chandra Deep Field South, COSMOS, the
HST Deep Field North, and the Extended Groth Strip. S-CANDELS builds
upon the existing coverage of these fields from the Spitzer Extended
Deep Survey (SEDS), a Cycle 6 Exploration Program, by increasing the
integration time from SEDS' 12hr to a total of 50hr but within a
smaller area, 0.16deg2. The additional depth significantly increases
the survey completeness at faint magnitudes. This paper describes the
S-CANDELS survey design, processing, and publicly available data
products. We present Infrared Array Camera (IRAC) dual-band
3.6+4.5µm catalogs reaching to a depth of 26.5 AB mag. Deep IRAC
counts for the roughly 135000 galaxies detected by S-CANDELS are
consistent with models based on known galaxy populations. The increase
in depth beyond earlier Spitzer/IRAC surveys does not reveal a
significant additional contribution from discrete sources to the
diffuse Cosmic Infrared Background (CIB). Thus it remains true that
only roughly half of the estimated CIB flux from COBE/DIRBE is resolved.
Description:
We chose to locate S-CANDELS inside the wider and shallower fields
already covered by Spitzer Extended Deep Survey (SEDS), in regions
that enjoy deep optical and NIR imaging from HST/CANDELS. These
S-CANDELS fields are thus the Extended GOODS-south (aka the GEMS
field, hereafter ECDFS; Rix et al. 2004ApJS..152..163R 2004ApJS..152..163R; Castellano et
al. 2010A&A...511A..20C 2010A&A...511A..20C), the Extended GOODS-north (HDFN; Giavalisco
et al. 2004, II/261; Wang et al. 2010, J/ApJS/187/251; Hathi et al.
2012ApJ...757...43H 2012ApJ...757...43H; Lin et al. 2012ApJ...756...71L 2012ApJ...756...71L), the UKIDSS UDS
(aka the Subaru/XMM Deep Field, Ouchi et al. 2001ApJ...558L..83O 2001ApJ...558L..83O;
Lawrence et al. 2007, II/319), a narrow field within the EGS (Davis et
al. 2007ApJ...660L...1D 2007ApJ...660L...1D; Bielby et al. 2012A&A...545A..23B 2012A&A...545A..23B), and a
strip within the UltraVista deep survey of the larger COSMOS field
(Scoville et al. 2007ApJS..172...38S 2007ApJS..172...38S; McCracken et al. 2012,
J/A+A/544/A156).
The S-CANDELS observing strategy was designed to maximize the area
covered to full depth within the CANDELS area. Each field was visited
twice with six months separating the two visits. Table 1 lists the
epochs for each field. All of the IRAC full-depth coverage is within
the SEDS area (Ashby et al. 2013, J/ApJ/769/80), and almost all is
within the area covered by HST for CANDELS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 51 The five S-CANDELS fields observing epochs
table7.dat 181 24842 Full-depth source catalog in S-CANDELS UDS field
table8.dat 181 42511 Full-depth source catalog in S-CANDELS ECDFS field
table9.dat 181 29110 Full-depth source catalog in S-CANDELS COSMOS field
table10.dat 181 22970 Full-depth source catalog in S-CANDELS HDFN field
table11.dat 181 18438 Full-depth source catalog in S-CANDELS EGS field
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
III/268 : DEEP2 Redshift Survey, Data Release 4 (Matthews+ 2013)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJS/209/22 : SSDF survey: IRAC catalogs (Ashby+, 2013)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013)
J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/ApJS/193/30 : UV-to-FIR analysis of sources in the EGS. II. (Barro+, 2011)
J/ApJ/727/1 : IRAC/MUSYC SIMPLE survey (Damen+, 2011)
J/ApJS/187/251 : Ultradeep Ks imaging in the GOODS-N (Wang+, 2010)
J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
J/ApJ/697/506 : Mid-infrared galaxy luminosity function from AGN (Dai+, 2009)
J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008)
J/AJ/105/1860 : 2-35 micron point source IR sky model (Cohen, 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Field Field identifier
8- 9 I2 h RAh Hour of right ascension (J2000)
11- 12 I2 min RAm Minute of right ascension (J2000)
14- 15 I2 s RAs Second of right ascension (J2000)
17 A1 --- DE- Sign of declination (J2000)
18- 19 I2 deg DEd Degree of declination (J2000)
21- 22 I2 arcmin DEm Arcminute of declination (J2000)
24- 25 I2 arcsec DEs Arcsecond of declination (J2000)
27- 31 F5.3 deg2 A3.6 [0.01/0.05] Field area observed in 3.6um
33- 37 F5.3 deg2 A4.5 [0.02/0.06] Field area observed in 4.5um
39- 43 I5 --- PID [8/80218] Spitzer program ID number
45- 55 A11 "YYYY/MMM/DD" Date1 First date of observation
57- 67 A11 "YYYY/MMM/DD" Date2 ? Second date of observation
69- 72 I4 --- BCD3.6 [114/6840] 3.6um BCD used
74- 77 I4 --- BCD4.5 [24/6840] 4.5um BCD used
79 A1 --- n_BCD4.5 [bc] Basic Calibrated Data (BCD) frames:
b=30s frames; c=200s frames.
81- 88 A8 --- Version Pipeline version
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Byte-by-byte Description of file: table[789].dat table1[01].dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Field Field identifier
8- 15 A8 --- --- [SCANDLES]
17- 35 A19 --- SCANDELS S-CANDLES project identifier
(JHHMMSS.ss+DDMMSS.s)
37- 45 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
47- 55 F9.5 deg DEdeg Declination in decimal degrees (J2000)
57- 61 F5.2 mag [3.6]psf [11.1/27.4] Spitzer/IRAC 3.6um PSF-fitted AB
magnitude
63- 68 F6.2 mag [3.6]2.4 ?=-99 Spitzer/IRAC 3.6µm 2.4" diameter
aperture AB magnitude
70- 75 F6.2 mag [3.6]3.6 ?=-99 Spitzer/IRAC 3.6µm 3.6" diameter
aperture AB magnitude
77- 82 F6.2 mag [3.6]4.8 ?=-99 Spitzer/IRAC 3.6µm 4.8" diameter
aperture AB magnitude
84- 89 F6.2 mag [3.6]6.0 ?=-99 Spitzer/IRAC 3.6µm 6.0" diameter
aperture AB magnitude
91- 96 F6.2 mag [3.6]7.2 ?=-99 Spitzer/IRAC 3.6µm 7.2" diameter
aperture AB magnitude
98-103 F6.2 mag [3.6]12 ?=-99 Spitzer/IRAC 3.6µm 12.0" diameter
aperture AB magnitude
105-108 F4.2 mag e_[3.6]2.4 [0.03/0.4] Error in [3.6]2.4
110-113 F4.2 mag B3.6 [0/0.4] Photometric bias already applied to
all 3.6 aperture magnitude
115-118 I4 hs C3.6 [0/4580] Depth of 3.6µm coverage (1)
120-124 F5.2 mag [4.5]psf [11.6/27.1] Spitzer/IRAC 4.5um PSF-fitted AB
magnitude
126-131 F6.2 mag [4.5]2.4 ?=-99 Spitzer/IRAC 4.5µm 2.4" diameter
aperture AB magnitude
133-138 F6.2 mag [4.5]3.6 ?=-99 Spitzer/IRAC 4.5µm 3.6" diameter
aperture AB magnitude
140-145 F6.2 mag [4.5]4.8 ?=-99 Spitzer/IRAC 4.5µm 4.8" diameter
aperture AB magnitude
147-152 F6.2 mag [4.5]6.0 ?=-99 Spitzer/IRAC 4.5µm 6.0" diameter
aperture AB magnitude
154-159 F6.2 mag [4.5]7.2 ?=-99 Spitzer/IRAC 4.5µm 7.2" diameter
aperture AB magnitude
161-166 F6.2 mag [4.5]12 ?=-99 Spitzer/IRAC 4.5µm 12.0" diameter
aperture AB magnitude
168-171 F4.2 mag e_[4.5]2.4 [0.03/0.4] Error in [4.5]2.4
173-176 F4.2 mag B4.5 [0/0.4] Photometric bias already applied to
all 4.5 aperture magnitude
178-181 I4 hs C4.5 [0/4248] Depth of 4.5µm coverage (2)
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Note (1): Version 2, generated May 22nd, 2015.
Note (2): In units of 100s exposures at the position of this source.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Aug-2015