J/AJ/170/60 CHILES Con Pol catalog & images (Gim+, 2025)
The CHILES Continuum and Polarization Survey.
II. Radio continuum source catalog and radio properties.
Gim H.B., Yun M.S., Luber N.M., Momjian E., Pisano D.J., Hess K.M.,
Blue Bird J., Hunt L.
<Astron. J., 170, 60 (2025)>
=2025AJ....170...60G 2025AJ....170...60G
ADC_Keywords: H I data; Interferometry; Radio continuum; Radio sources; VLBI
Keywords: Surveys ; Radio continuum emission ; Extragalactic radio sources
Abstract:
The COSMOS H I Large Extragalactic Survey (CHILES) Continuum and
Polarization survey is an ultradeep continuum imaging study of the
COSMOS field conducted using the Karl G. Jansky Very Large Array. We
obtained 1000hr of L-band (λ=20cm) observations across four
spectral windows (SPWs; 1.063-1.831GHz) in a single pointing and
produced a confusion-limited image with an apparent rms noise of
1.67uJy/beam with a synthesized beam of 5.5"x5.0". This paper reports
a 1.4GHz radio continuum source catalog containing 1678 sources
detected above 7σ (flux densities greater than 11.7uJy),
identified using two independent source extraction programs applied to
the Stokes I image. Resolved sources dominate at flux density
S1.4GHz≥42uJy. The radio spectral index for each source was derived
using a power-law fit across the four SPWs, and we found that a robust
spectral index measurement requires a total signal-to-noise ratio of
at least 20. Comparisons with previous 1.4GHz radio continuum surveys
show good overall consistency, but evidence for a high degree of
catalog incompleteness and the effects of source confusion are evident
for some of the earlier studies.
Description:
The COSMOS H I Large Extragalactic Survey (CHILES) Continuum and
Polarization survey (CHILES Con Pol) observations used the Karl G.
Jansky Very Large Array (VLA), located in New Mexico, USA, in its
second most extended (B) configuration with 1027hr of total observing
time in the L-band (1-2GHz). The observations took place on 2013-10-25
and employed four spectral windows (SPWs) chosen to avoid the range of
frequencies with known strong radio frequency interference (RFI). The
central frequencies of the four chosen SPWs are 1.063, 1.447, 1.703,
and 1.831GHz. Each SPW featured a bandwidth of 128MHz and 64 channels
with a channel width of 2MHz and full polarization products. Details
of the experimental design as well as data reduction and imaging
procedures are described in Paper I (Luber+, 2025AJ....170...59L 2025AJ....170...59L). The
final image has a synthesized beam size of 5.5"x5.0" (FWHM), an
effective frequency of 1.447GHz, and an rms noise of 1.09uJy/beam,
measured at ≥40' from the phase center in the Stokes I image. The rms
noise measured in the central 3'x3' region was 1.67uJy/beam.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 98 1678 CHILES Con Pol radio continuum source catalog
fits/* . 2 Individual image FITS files
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See also:
J/ApJ/554/803 : New VLA Sky Survey (NVSS) Cat of IRAS 2 Jy Galaxies (Yun+ 2001)
J/ApJ/586/794 : Multiwavelength luminosities of galaxies (Bell, 2003)
J/A+A/403/857 : VLA-VIRMOS Deep Field (Bondi+, 2003)
J/A+A/398/901 : VLA survey at 6 cm in the Lockman Hole (Ciliegi+, 2003)
J/A+A/457/517 : ATESP 5 GHz radio survey. I. (Prandoni+, 2006)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
J/ApJS/188/384 : The VLA-COSMOS survey. IV. (Schinnerer+, 2010)
J/MNRAS/429/2080 : Lockman Hole 10C srcs radio spectral indices (Whittam+ 2013)
J/A+A/602/A2 : VLA-COSMOS 3 GHz Large Project. II. (Smolcic+, 2017)
J/A+A/602/A1 : VLA-COSMOS 3 GHz Large Project (Smolcic+, 2017)
J/ApJ/858/77 : DEIMOS 10K spectr. survey in COSMOS field (Hasinger+, 2018)
J/ApJS/235/34 : Deep JVLA imaging of GOODS-N at 20cm (Owen, 2018)
J/ApJ/875/80 : Faint radio srcs in GOODS-N and -S. I. VLA 5GHz (Gim+, 2019)
J/ApJ/909/193 : The 1.266GHz MeerKAT DEEP2 component cat. (Matthews+, 2021)
J/A+A/648/A2 : LOFAR Two-metre Sky Survey Deep Fields DR1 (Sabater+, 2021)
J/MNRAS/509/2150 : MIGHTEE catalogues of COSMOS/XMM-LSS fields (Heywood+, 2022)
J/ApJS/258/11 : The COSMOS2020 catalog (Weaver+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/1678] CHILES Con Pol 7σ catalog
identifier
6- 7 I2 h RAh [10] Hour of Right Ascension (J2000)
9 I1 min RAm [0/2] Minute of Right Ascension (J2000)
11- 16 F6.3 s RAs Second of Right Ascension (J2000)
18 I1 deg DEd [2] Degree of Declination (J2000)
20- 21 I2 arcmin DEm [6/35] Arcminute of Declination (J2000)
23- 28 F6.3 arcsec DEs Arcsecond of Declination (J2000)
30- 34 F5.3 arcsec e_RAs [0/0.582] Uncertainty in RAs
36- 40 F5.3 arcsec e_DEs [0/0.717] Uncertainty in DEs
42- 50 E9.3 Jy SPeak [1.2e-5/0.01] The 1.4GHz peak flux density
52- 60 E9.3 Jy e_SPeak [8.6e-7/3e-4] Uncertainty in SPeak
62- 70 E9.3 Jy SInt [1.2e-5/0.02] The 1.4GHz integrated flux density
72- 80 E9.3 Jy e_SInt [8.6e-7/6e-4] Uncertainty in SInt
82- 89 F8.3 --- SI [-3.02/2.31]?=-999 Spectral index
91- 98 F8.3 --- e_SI [4e-3/2.13]?=-999 Uncertainty in SI
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History:
From electronic version of the journal
References:
Luber et al. Paper I. 2025AJ....170...59L 2025AJ....170...59L
Gim et al. Paper II. 2025AJ....170...60G 2025AJ....170...60G This catalog
(End) Prepared by [AAS], Robin Leichtnam [CDS] 20-May-2026