S-CANDELS the Spitzer-Cosmic Assembly Near-infrared Deep Extragalactic Survey. Survey design, photometry, and deep IRAC source counts. (2015)
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
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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; Castellano et
al. 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; Lin et al. 2012ApJ...756...71L), the UKIDSS UDS
(aka the Subaru/XMM Deep Field, Ouchi et al. 2001ApJ...558L..83O;
Lawrence et al. 2007, II/319), a narrow field within the EGS (Davis et
al. 2007ApJ...660L...1D; Bielby et al. 2012A&A...545A..23B), and a
strip within the UltraVista deep survey of the larger COSMOS field
(Scoville et al. 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.
- 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
- 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)
