J/ApJS/275/28 The AstroSat UV Deep Field south. I. GOODS-S (Saha+, 2024)
The AstroSat UV Deep Field south (AUDFs).
I. Far- and near-ultraviolet source catalog of the GOODS South region.
Saha K., Maulick S., Pandey P., Bhattacharya S., Borgohain A., Mondal C.,
Rafelski M., Kataria M., Teplitz H.I., Tandon S.N., Windhorst R.A.,
Elmegreen B.G., Herenz E.C., Rutkowski M.
<Astrophys. J. Suppl. Ser., 275, 28 (2024)>
=2024ApJS..275...28S 2024ApJS..275...28S
ADC_Keywords: Photometry, ultraviolet; Surveys; Cross identifications;
Galaxy catalogs
Keywords: Astronomical methods ; Ultraviolet astronomy ; Catalogs ;
Sky surveys ; Galaxy photometry ; High-redshift galaxies ;
Galaxy formation
Abstract:
We present the AstroSat UV Deep Field south (AUDFs), an imaging survey
using the wide-field Ultraviolet Imaging Telescope on board AstroSat.
AUDFs cover ∼236arcmin2 of the sky area, including the Great
Observatories Origins Deep Survey (GOODS) South field in F154W and
N242W filters. The deep and shallow parts of AUDFs have an exposure
time ∼62000 and ∼31000s, respectively, in the F154W filter, while in
the N242W filter, they are ∼64000 and ∼34000s. These observations
reached a 3σ depth of 27.2 and 27.7 AB mag with a 50%
completeness limit of 27 and 27.6 AB mag in the F154W and N242W
filters, respectively. With the acquired depth, AUDFs is the deepest
far- and near-UV imaging data covering the largest area known to date
at 1.2"-1.6" spatial resolution. Two primary catalogs were constructed
for the F154W and N242W filters, each containing 13495 and 19374
sources brighter than the 3σ detection limit, respectively. Our
galaxy counts of a power-law slope of ∼0.43dex/mag in the N242W filter
match well with Hubble Space Telescope/Wide-Field Camera 3/UVIS
observations. A wide range of extragalactic science can be achieved
with this unique data, such as providing a sample of galaxies emitting
ionizing photons in the redshift range of z ∼1-3 and beyond,
constraining the UV luminosity function, investigating the extended UV
emission around star-forming galaxies and UV morphologies for z<1. The
UV catalog will enhance the legacy value of the existing optical/IR
imaging and spectroscopic observations from ground- and space-based
telescopes on the GOODS South field.
Description:
The FUV (F154W: λ∼1300-1800Å) and NUV (N242W:
λ∼2000-3000Å) imaging data come from UVIT/AstroSat
observations of the Chandra Deep Field South (ObsID: GT05-240,
PI: Kanak Saha). The observations were planned with two pointing
(called CDFS-I and CDFS-II, see Figure 1) per filter, such that both
fields of view of size 28' diameter have an overlapping region
containing the GOODS South field.
The UVIT on board AstroSat performed these observations simultaneously
in FUV and NUV filters in photon counting (PC) mode during
2016 September-October.
In addition to the FUV/NUV observations, UVIT also carried out
observations in the VISUAL band using the VIS3 channel (V461W:
3878-5325Å) in the integration mode with a frame rate of 1 frame
per second during the same period.
We provide carefully constructed separate catalogs of sources
identified in F154W and N242W filters for the AstroSat UV Deep Field
south (AUDFs) field.
We additionally provide a catalog of Hubble Legacy Fields (HLF) GOODS
South (Whitaker+ 2019, J/ApJS/244/16) crossmatched sources separately
for the F154W and N242W bands.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catf154w.dat 161 13885 AstroSat UV Deep Field south (AUDFs) F154W catalog
consisting of detected UVIT objects with SNR>3
(Version 1) (see Table 5; AUDFs-F154W-Cat0-v1)
catn242w.dat 162 20097 AstroSat UV Deep Field south (AUDFs) N242W catalog
consisting of detected UVIT objects with SNR>3
(Version 1) (see Table 5; AUDFsN242WCat0-v1)
table6.dat 125 14049 AstroSat UV Deep Field south (AUDFs) N242W
cross-matched catalog having an individual or
multiple counterparts in W19
(Whitaker+ 2019, J/ApJS/244/16) HLF catalog
(Version 1; AUDFs-N242W-Cat1-v1)
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/ApJ/631/85 : Galaxy morphologies in the Hubble UDF (Elmegreen+, 2005)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
J/ApJ/639/724 : Tadpole galaxies in the Hubble UDF (Straughn+, 2006)
J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007)
J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)
J/A+A/511/A50 : JHks of GOODS-South field (Retzlaff+, 2010)
J/A+A/533/A119 : GOODS-Herschel North and South catalogs (Elbaz+, 2011)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/A+A/570/A11 : The Hawk-I UDS and GOODS Survey (HUGS) (Fontana+, 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/AJ/150/31 : Phot. and redshifts of galaxies in the UDF (Rafelski+, 2015)
J/ApJ/801/97 : GOODS-S & UDS stellar mass cat. from CANDELS (Santini+, 2015)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
J/A+A/606/A12 : MUSE-Wide survey: 831 emission line galaxies (Herenz+, 2017)
J/ApJS/228/2 : Chandra Deep Field-South survey: 7Ms sources (Luo+, 2017)
J/ApJS/237/12 : The Hubble Deep UV Legacy Survey (HDUV) (Oesch+, 2018)
J/ApJS/235/14 : HFF-DeepSpace phot. cat. of 12 HFF fields (Shipley+, 2018)
J/A+A/624/A141 : MUSE-Wide Survey DR1 catalog (Urrutia+, 2019)
J/ApJS/244/16 : HLF photometric catalog in GOODS-S v2.1 (Whitaker+, 2019)
J/ApJ/891/144 : CFHT dwarf satellite gal. around LV hosts (Carlsten+, 2020)
J/A+A/670/A4 : MUSE Hubble Ultra Deep Field surveys. DR2 (Bacon+, 2023)
J/ApJ/946/65 : AstroSat/UVIT obs. of SMC: point-source cat. (Devaraj+, 2023)
J/ApJS/264/40 : AstroSat UV GOODS-N Deep Field cat. (AUDFn) (Mondal+, 2023)
J/ApJS/265/40 : MUDF III. HST grism spectroscopy & imaging (Revalski+, 2023)
Byte-by-byte Description of file: catf154w.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- IDF154W [7/25425] Identification number in the
catalog
7- 18 A12 --- NameFUV Unique string associated with the F154W
object (AUDFs_FNNNNN)
20- 27 F8.3 pix Xpix X pixel coordinate, object centroid
29- 36 F8.3 pix Ypix Y pixel coordinate, object centroid
38- 45 F8.5 deg RAdeg Right Ascension, F154W object centroid
(J2000)
47- 55 F9.5 deg DEdeg Declination, F154W object centroid (J2000)
57- 62 F6.3 mag F154Wmag1 [20.99/29.6] F154W AB magnitude in 0.7"
aperture (1)
64- 68 F5.3 mag e_F154Wmag1 [0.001/1.6] Error in F154Wmag1
70- 75 F6.3 mag F154Wmag2 [20/28.3] F154W AB magnitude in 1.2"
aperture (1)
77- 81 F5.3 mag e_F154Wmag2 [0.001/0.8] Error in F154Wmag1
83- 88 F6.3 mag F154Wmag3 [19.8/28.8] F154W AB magnitude in 1.6"
aperture (1)
90- 94 F5.3 mag e_F154Wmag3 [0.001/1.4] Error in F154Wmag1
96- 101 F6.3 mag F154Wmag [19.27/29] F154W AB magnitude in Kron
(F154W_AUTO) aperture
103- 107 F5.3 mag e_F154Wmag [0.002/3] Error in F154Wmag
109- 114 F6.3 pix FRad [0.3/76.1] Radius that encloses 50% of
object's total F154W flux
116- 120 F5.2 --- KRadfac [3.5/10.5] Reduced Kron Pseudoradius factor
(2)
122- 127 F6.3 pix Aimg [0.8/18.7] Semi-major axis (2)
129- 133 F5.3 pix e_Aimg [0.028/3] Uncertainty in Aimg
135- 139 F5.3 pix Bimg [0.36/8.2] Semi-minor axis (2)
141- 145 F5.3 pix e_Bimg [0.02/0.7] Uncertainty in Bimg
147- 152 F6.2 deg PA [-90/90] Source position angle, east of north
154- 159 F6.3 --- SNR [3/69.4] Signal-to-noise of object (3)
161 I1 --- NUV [0/1]? Flag denoting the presence of an
object in the N242W band (4)
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Note (1): Not aperture corrected.
Note (2): The radii (in pixels) of the semi-major and semi-minor axis
of the Kron aperture are obtained by multiplying KRadfac with the
Aimage and Bimage parameters respectively.
Note (3): Signal-to-noise of object estimated with Equation 7 within
a circular aperture of radius 1.6" [mag3].
Note (4): Flag denoting the presence of an object in the N242W band
in the vicinity of the F154W object. See text for more
information. Possible values as follows:
0 = no object;
1 = possible object(s).
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Byte-by-byte Description of file: catn242w.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- IDN242W [1/30685] Identification number in the
catalog
7- 18 A12 --- NameNUV Unique string associated with the N242W
object (AUDFs_NNNNNN)
20- 27 F8.3 pix Xpix X pixel coordinate, object centroid
29- 36 F8.3 pix Ypix Y pixel coordinate, object centroid
38- 45 F8.5 deg RAdeg [52.9/53.3] Right Ascension, N242W object
centroid (J2000)
47- 55 F9.5 deg DEdeg [-28/-27.6] Declination, N242W object
centroid (J2000)
57- 62 F6.3 mag N242Wmag1 [18.2/30.1] N242W AB magnitude in 0.7"
aperture (1)
64- 68 F5.3 mag e_N242Wmag1 [0/1.6] Error in N242Wmag1
70- 75 F6.3 mag N242Wmag2 [17.6/29.3] N242W AB magnitude in 1.2"
aperture (1)
77- 81 F5.3 mag e_N242Wmag2 [0/1.4] Error in N242Wmag1
83- 88 F6.3 mag N242Wmag3 [17.5/29.5] N242W AB magnitude in 1.6"
aperture (1)
90- 94 F5.3 mag e_N242Wmag3 [0/2.4] Error in N242Wmag1
96- 101 F6.3 mag N242Wmag [17/29] N242W AB magnitude in Kron
(N242W_AUTO) aperture
103- 107 F5.3 mag e_N242Wmag [0/3.3] Error in N242Wmag
109- 114 F6.3 pix FRad [0.6/37] Radius that encloses 50% of
object's total N242W flux
116- 120 F5.2 --- KRadfac [3.5/11.4] Reduced Kron Pseudoradius factor
(2)
122- 127 F6.3 pix Aimg [0.5/15] Semi-major axis (2)
129- 133 F5.3 pix e_Aimg [0.003/2.1] Uncertainty in Aimg
135- 139 F5.3 pix Bimg [0.2/9] Semi-minor axis (2)
141- 145 F5.3 pix e_Bimg [0.002/0.6] Uncertainty in Bimg
147- 152 F6.2 deg PA [-90/90] Source position angle, east of north
154- 160 F7.3 --- SNR [3/429] Signal-to-noise of object (3)
162 I1 --- FUV [0/1]? Flag denoting the presence of an
object in the F154W band (4)
--------------------------------------------------------------------------------
Note (1): Not aperture corrected.
Note (2): The radii (in pixels) of the semi-major and semi-minor axis
of the Kron aperture are obtained by multiplying KRadfac with the
Aimage and Bimage parameters respectively.
Note (3): Signal-to-noise of object estimated with Equation 7 within
a circular aperture of radius 1.6" [mag3].
Note (4): Flag denoting the presence of an object in the F154W band
in the vicinity of the N242W object. See text for more
information. Possible values as follows:
0 = no object;
1 = possible object(s).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- IDN242W [1/30685] Identification number in the
catN242W catalog (AUDFsN242WCat0-v1)
7- 18 A12 --- NameNUV Unique string associated with the N242W
object AUDFs_NNNNNN
20- 27 F8.5 deg RAdeg [52.9/53.3] Right Ascension, N242W object
centroid (J2000)
29- 37 F9.5 deg DEdeg [-28/-27.6] Declination, N242W object
centroid (J2000)
39- 44 F6.3 mag N242Wmag2 [17.6/28.8] N242W AB magnitude in 1.2"
aperture (1)
46- 50 F5.3 mag e_N242Wmag2 [0/1] Error in N242Wmag1
52- 57 F6.3 mag N242Wmag [17/29] N242W AB magnitude in Kron
(N242W_AUTO) aperture
59- 63 F5.3 mag e_N242Wmag [0/2] Error in N242Wmag
65- 69 I5 --- IDF154W [17/25425] Identification number in the
nearest neighbor in catF154W
(AUDFs-F154W-Cat0-v1)
71- 76 F6.3 mag F154Wmag3 [19.8/28.6] F154W AB magnitude in 1.6"
aperture (1)
78- 82 F5.3 mag e_F154Wmag3 [0.001/1.3] Error in F154Wmag1
84- 89 F6.3 mag F154Wmag [19.2/28.2] F154W AB magnitude in Kron
(F154W_AUTO) aperture
91- 95 F5.3 mag e_F154Wmag [0.002/1.3] Error in F154Wmag
97- 102 I6 --- CANDELS [13475/172826] Identifier of the nearest
neighbour from the W19 catalog (2)
104- 111 F8.5 deg RAGdeg Right Ascension, W19 Gaia-corrected position
(J2000)
113- 121 F9.5 deg DEGdeg Declination, W19 Gaia-corrected position
(J2000)
123 I1 --- Mult [1/2] Flag denoting whether there are single
or multiple objects (3)
125 I1 --- FUV [0/2]? Flag denoting the presence of an
object in the F154W band (4)
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Note (1): Not aperture corrected.
Note (2): The nearest neighbour from the Whitaker+ (2019, J/ApJS/244/16)
Hubble Legacy Fields Catalogs Version 2.0 catalog as obtained from
this source: https://archive.stsci.edu/hlsps/hlf/v2.0/catalogs/
Note (3): Flag denoting whether there are single or multiple objects
in the W19 catalog in the vicinity of the N242W object. See text
for more information. Possible values are as follows:
1 = single object;
2 = multiple objects.
Note (4): Flag denoting the presence of an object in the F154W band
in the vicinity of the N242W object. See text for more
information. Possible values are as follows:
0 = no object;
1 = single object;
2 = multiple objects.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Maulick et al. Paper II. 2025ApJ...984...40M 2025ApJ...984...40M
Bhattacharya et al. Paper III. 2025MNRAS.540L..65B 2025MNRAS.540L..65B
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Oct-2025