J/ApJS/221/23 IRAC HUDF and GOODS ultradeep surveys (Labbe+, 2015)
Ultradeep IRAC imaging over the HUDF and GOODS-South: survey design and imaging
data release.
Labbe I., Oesch P.A., Illingworth G.D., van Dokkum P.G., Bouwens R.J.,
Franx M., Carollo C.M., Trenti M., Holden B., Smit R., Gonzalez V.,
Magee D., Stiavelli M., Stefanon M.
<Astrophys. J. Suppl. Ser., 221, 23 (2015)>
=2015ApJS..221...23L 2015ApJS..221...23L (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry, infrared
Keywords: galaxies: high-redshift; surveys
Abstract:
The IRAC ultradeep field and IRAC Legacy over GOODS programs are two
ultradeep imaging surveys at 3.6 and 4.5µm with the Spitzer
Infrared Array Camera (IRAC). The primary aim is to directly detect
the infrared light of reionization epoch galaxies at z>7 and to
constrain their stellar populations. The observations cover the Hubble
Ultra Deep Field (HUDF), including the two HUDF parallel fields, and
the CANDELS/GOODS-South, and are combined with archival data from all
previous deep programs into one ultradeep data set. The resulting
imaging reaches unprecedented coverage in IRAC 3.6 and 4.5µm
ranging from >50hr over 150arcmin2, >100hr over 60sq arcmin2, to
∼200hr over 5-10arcmin2. This paper presents the survey description,
data reduction, and public release of reduced mosaics on the same
astrometric system as the CANDELS/GOODS-South Wide Field Camera 3
(WFC3) data. To facilitate prior-based WFC3+IRAC photometry, we
introduce a new method to create high signal-to-noise PSFs from the
IRAC data and reconstruct the complex spatial variation due to survey
geometry. The PSF maps are included in the release, as are registered
maps of subsets of the data to enable reliability and variability
studies. Simulations show that the noise in the ultradeep IRAC images
decreases approximately as the square root of integration time over
the range 20-200hr, well below the classical confusion limit, reaching
1σ point-source sensitivities as faint as 15nJy (28.5 AB) at
3.6µm and 18nJy (28.3 AB) at 4.5µm. The value of such ultradeep
IRAC data is illustrated by direct detections of z=7-8 galaxies as
faint as HAB=28.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 40 354 Summary of individual AORs
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
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/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/A+A/570/A11 : The Hawk-I UDS and GOODS Survey (HUGS) (Fontana+, 2014)
J/MNRAS/432/2696 : Galaxy luminosity function at z = 7-9 (McLure+, 2013)
J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013)
J/ApJ/756/164 : UV galaxies in CANDELS from z=8 to z=4 (Finkelstein+, 2012)
J/ApJ/738/69 : SEDs of galaxies at 3.8<z<5 in GOODS (Shim+, 2011)
J/ApJ/727/1 : IRAC/MUSYC SIMPLE survey (Damen+, 2011)
J/ApJ/655/51 : HDFS IRAC observations of 2<z<3.5 galaxies (Wuyts+, 2007)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
J/A+A/449/951 : GOODS-MUSIC sample: multicolour catalog (Grazian+, 2006)
J/AJ/125/1107 : Ultra-deep near-IR observation in HDF-S (Labbe+, 2003)
J/ApJ/513/34 : HDF photometric redshifts catalog (Fernandez-Soto+, 1999)
http://www.strw.leidenuniv.nl/iudf/ : IRAC Ultradeep Field (IUDF) home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- PID [194/80217] Program Identifier
7- 14 I8 --- AOR Spitzer/IRAC AOR key
16- 28 F13.7 --- MJD [53043.5/56779.7] Modified Julian Day in UTC
at start of observation
30- 34 F5.1 arcmin2 Area [21.4/328.5] Total area (1)
36- 40 F5.2 h Exp [0.1/10.3] Mean exposure time in hour over Area
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Note (1): With >50% of the maximum exposure time on sky.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Jan-2016