J/ApJS/257/68 Spitzer/IRAC full-depth phot. from GREATS (Stefanon+, 2021)
The Spitzer/IRAC Legacy over the GOODS fields: full-depth 3.6, 4.5, 5.8, and
8.0µm mosaics and photometry for >9000 galaxies at z∼3.5-10 from the GOODS
Reionization Era wide-Area Treasury from Spitzer (GREATS).
Stefanon M., Labbe I., Oesch P.A., De Barros S., Gonzalez V.,
Bouwens R.J., Franx M., Illingworth G.D., Holden B., Magee D., Smit R.,
van Dokkum P.
<Astrophys. J. Suppl. Ser., 257, 68 (2021)>
=2021ApJS..257...68S 2021ApJS..257...68S
ADC_Keywords: Galaxies, photometry; Photometry, infrared; Surveys
Keywords: High-redshift galaxies ; Galaxy photometry ; Infrared photometry ;
Surveys
Abstract:
We present the deepest Spitzer/InfraRed Array Camera (IRAC) 3.6, 4.5,
5.8, and 8.0µm wide-area mosaics yet over the Great Observatories
Origins Deep Survey (GOODS)-N and GOODS-S fields as part of the GOODS
Reionization Era wide-Area Treasury from Spitzer (GREATS) project. We
reduced and mosaicked in a self-consistent way observations taken by
the 11 different Spitzer/IRAC programs over the two GOODS fields from
12yr of Spitzer cryogenic and warm- mission data. The cumulative depth
in the 3.6µm and 4.5µm bands amounts to ∼4260hr, ∼1220hr of
which are new very deep observations from the GREATS program itself.
In the deepest area, the full-depth mosaics reach ≳200hr over an area
of ∼100arcmin2, corresponding to a sensitivity of ∼29 AB magnitude
at 3.6µm (1σ for point sources). Archival cryogenic 5.8µm
and 8.0µm band data (a cumulative 976hr) are also included in the
release. The mosaics are projected onto the tangential plane of the
Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/GOODS
at a 0.3/pixel scale. This paper describes the methodology enabling,
and the characteristics of, the public release of the mosaic science
images, the corresponding coverage maps in the four IRAC bands, and
the empirical point-spread functions (PSFs). These PSFs enable
mitigation of the source blending effects by taking into account the
complex position-dependent variation in the IRAC images. The GREATS
data products are in the Infrared Science Archive. We also release the
deblended 3.6-8.0µm photometry 9192 Lyman-break galaxies at
z∼3.5-10. GREATS will be the deepest mid-infrared imaging until the
James Webb Space Telescope and, as such, constitutes a major resource
for characterizing early galaxy assembly.
Description:
The GOODS fields are centered at RAJ2000=12:36:55,DEJ2000=+62:14:15
(GOODS-N), and RAJ2000=03:32:30,DEJ2000=-27:48:20 (GOODS-S),
respectively, and benefit from extensive IRAC coverage. Specifically,
our mosaics combine essentially all observations from past programs to
new observations at 3.6 and 4.5um from the GOODS Reionization Era
wide-Area Treasury from Spitzer (GREATS) program (PI: I. Labbe).
Our Cycle 11 GREATS program added significantly to the GOODS archival
data sets. The full set of astronomical observation requests (AORs)
from the GREATS program is listed in Table 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 56 318 Summary of GOODS Reionization Era wide-Area
Treasury from Spitzer (GREATS) AORs
table3.dat 116 9192 GREATS photometry for the Lyman-break galaxies of
Bouwens+ (2015, J/ApJ/803/34)
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/353 : The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020)
J/AJ/120/2747 : HDF-South WFPC2 observations (Casertano+, 2000)
J/A+A/379/740 : ESO Imaging Survey (EIS) (Arnouts+, 2001)
J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008)
J/ApJS/188/178 : VLA 1.4GHz observations of GOODS-North field (Morrison+, 2010)
J/ApJS/187/251 : Ultradeep Ks imaging in the GOODS-N (Wang+, 2010)
J/ApJ/727/1 : IRAC/MUSYC SIMPLE survey (Damen+, 2011)
J/PASJ/63/S379 : MOIRCS Deep Survey deep and wide catalogs (Kajisawa+, 2011)
J/ApJ/754/83 : UV continuum for z∼4-7 star-forming galaxies (Bouwens+, 2012)
J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013)
J/A+A/570/A11 : The Hawk-I UDS and GOODS Survey (HUGS) (Fontana+, 2014)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/ApJS/218/33 : Spitzer-CANDELS catalog within 5 deep fields (Ashby+, 2015)
J/ApJ/803/34 : z∼4-10 galaxies from HST legacy fields (Bouwens+, 2015)
J/ApJ/810/71 : UV mag of candidate galaxies at 3~<z~<8.5 (Finkelstein+, 2015)
J/ApJS/221/23 : IRAC HUDF and GOODS ultradeep surveys (Labbe+, 2015)
J/ApJS/219/15 : Morphologies of z=0-10 galaxies with HST data (Shibuya+, 2015)
J/ApJS/237/39 : Spitzer survey of UltraVISTA deep Stripes (Ashby+, 2018)
J/A+A/618/A85 : Spectroscopy of 3<z<4 quiescent galaxies (Schreiber+ 2018)
J/ApJS/244/16 : HLF photometric catalog in GOODS-S v2.0 (Whitaker+, 2019)
J/A+A/634/A97 : VUDS UV and Lyα luminosity functions (Khusanova+, 2020)
J/ApJ/889/189 : Brightest high-z galaxies in RELICS clusters (Salmon+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 1 A1 --- Field GOODS field name (N=159 occurrences; or
S=159 occurrences)
3- 10 I8 --- AOR [54316032/54421504] Spitzer Astronomical
Observation Request identifier (1)
12- 22 F11.7 deg RAdeg [53/189.4] Right Ascension (J2000) (2)
24- 34 F11.7 deg DEdeg [-28/62.4] Declination (J2000) (2)
36- 42 F7.2 deg PA [-114/146] Array position angle; East of North
44- 56 F13.7 d MJD [57140.37/57478.29] Modified Julian Date (3)
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Note (1): The execution time of each AOR is ∼2.75h, with a frame time of 100s
and exposure time of 93.6s per frame. Each GOODS-N AOR covers an area
of ∼50arcmin2 per band, while each GOODS-S AOR covers
∼25arcmin2 per band.
Note (2): Positions correspond to the 3.6um array center of the first
frame taken for the given AOR.
Note (3): In UTC at start of the first observation in the AOR.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [GOODS-]
7- 7 A1 --- Field GOODS field identifier ("N" or "S")
9- 27 A19 --- ID Source identifier
29- 30 I2 h RAh [3/12] Hour of Right Ascension (J2000)
32- 33 I2 min RAm [31/38] Minute of Right Ascension (J2000)
35- 40 F6.3 s RAs Second of Right Ascension (J2000)
42- 42 A1 --- DE- Sign of the Declination (J2000)
43- 44 I2 deg DEd Degree of Declination (J2000)
46- 47 I2 arcmin DEm Arcminute of Declination (J2000)
49- 54 F6.3 arcsec DEs Arcsecond of Declination (J2000)
56- 57 I2 --- zbin [4/10] Redshift bin (1)
59- 65 F7.1 nJy F3.6 [-474/12983] Spitzer/IRAC 3.6um band flux density
67- 72 F6.1 nJy e_F3.6 [5/1230] The 1σ uncertainty in F3.6
74- 80 F7.1 nJy F4.5 [-534/16217] Spitzer/IRAC 4.5um band flux density
82- 86 F5.1 nJy e_F4.5 [7.5/947] The 1σ uncertainty in F4.5
88- 94 F7.1 nJy F5.8 [-1826/19967] Spitzer/IRAC 5.8um band flux density
96-101 F6.1 nJy e_F5.8 [67/1284] The 1σ uncertainty in F5.8
103-109 F7.1 nJy F8.0 [-5975/28651] Spitzer/IRAC 8.0um band flux density
111-116 F6.1 nJy e_F8.0 [70.4/5317] The 1σ uncertainty in F8.0
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Note (1): Originally assigned to the source by the analysis
of Bouwens+, 2015, J/ApJ/803/34 (<[BIO2015] {ID}> in Simbad).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Apr-2022