J/ApJ/856/67 VLA 3GHz radio source catalog in the Lockman Hole (Cotton+, 2018)
The angular size distribution of µJy radio sources.
Cotton W.D., Condon J.J., Kellermann K.I., Lacy M., Perley R.A.,
Matthews A.M., Vernstrom T., Scott D., Wall J.V.
<Astrophys. J., 856, 67 (2018)>
=2018ApJ...856...67C 2018ApJ...856...67C
ADC_Keywords: Radio sources; Infrared sources
Keywords: catalogs; galaxies: fundamental parameters; galaxies: star formation;
infrared: galaxies; radio continuum: galaxies; surveys
Abstract:
We made two new sensitive (rms noise σn∼1µJy/beam)
high-resolution (θ=3.0" and θ=0.66" FWHM) S-band
(2<ν<4GHz) images covering a single JVLA primary beam (FWHM∼14')
centered on RAJ2000=10:46,DEJ2000=+59:01 in the Lockman Hole. These
images yielded a catalog of 792 radio sources, 97.7±0.8% of which
have infrared counterparts stronger than S∼2µJy at λ=4.5µm.
About 91% of the radio sources found in our previously published,
comparably sensitive low-resolution (θ=8" FWHM) image covering
the same area were also detected at 0.66" resolution, so most radio
sources with S(3GHz)≳5µJy have angular structure φ≲0.66". The
ratios of peak brightness in the 0.66" and 3" images have a
distribution indicating that most µJy radio sources are quite
compact, with a median Gaussian angular diameter <φ≥0.3"±0.1"
FWHM and an rms scatter σφ≲0.3" of individual sizes. Most
of our µJy radio sources obey the tight far-infrared/radio
correlation, indicating that they are powered by star formation. The
median effective angular radius enclosing half the light emitted by an
exponential disk is <ρe≳<φ>/2.43∼0.12", so the median
effective radius of star-forming galaxies at redshifts z∼1 is
<re≳1.0kpc.
Description:
VLA S-band (2<ν<4GHz) observations centered on
RAJ2000=10:46,DEJ2000=+59:01 were obtained on 2012 Feb 21-Mar 18 in C
configuration, on 2014 Feb 02-Feb 18 in B+ configuration and on 2015
Jul 10-Sep 13 in A configuration. The C-configuration observations
were described in Condon+ (2012ApJ...758...23C 2012ApJ...758...23C), Lane+ (2014, VIII/97)
and Vernstrom+ 2016, J/MNRAS/462/2934).
A catalog of 792 radio sources at 3GHz was derived from sensitive
(σ∼1µJy/beam) VLA S-band (2<ν<4GHz) images having 3" and
0.66" resolution. The reliability of the source detections was
evaluated and is supported by identifications with IR sources from the
Spitzer observations described in Mauduit+ (2012PASP..124..714M 2012PASP..124..714M).
Because 97.7% of the radio sources have IR counterparts, the
reliability of sources in the catalog should be ≳98%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 134 792 Source catalog
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See also:
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
J/A+A/398/901 : VLA survey at 6 cm in the Lockman Hole (Ciliegi+, 2003)
J/MNRAS/371/963 : Deep VLA survey in Lockman Hole, HDFN, ELAIS (Biggs+, 2006)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
J/MNRAS/387/1037 : 610-MHz survey of Lockman Hole with GMRT (Garn+, 2008)
J/ApJ/714/1305 : The Deep SWIRE Field (DSF) IV. (Strazzullo+, 2010)
J/A+A/529/A135 : AGN Opt/IR properties in Lockman Hole (Rovilos+, 2011)
J/A+A/551/A97 : Lockman Hole/XMM VLBI observations (Middelberg+, 2013)
J/MNRAS/429/2080 : Lockman Hole 10C radio spectral indices (Whittam+ 2016)
J/MNRAS/462/2934 : Lockman Hole North 3GHz catalogue (Vernstrom+, 2016)
J/ApJ/850/83 : DANCING-ALMA I. submm/mm continuum sources (Fujimoto+, 2017)
J/A+A/602/A1 : VLA-COSMOS 3 GHz Large Project (Smolcic+, 2017)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh [10] Hour of Right Ascension (J2000)
4- 5 I2 min RAm [44/47] Minute of Right Ascension (J2000)
7- 12 F6.3 s RAs Second of Right Ascension (J2000)
14- 19 F6.3 s e_RAs [0.005/0.11] Error in RAs
21- 21 A1 --- DE- [+] Sign of the Declination (J2000)
22- 23 I2 deg DEd [58/59] Degree of Declination (J2000)
25- 26 I2 arcmin DEm Arcminute of Declination (J2000)
28- 32 F5.2 arcsec DEs Arcsecond of Declination (J2000)
34- 38 F5.2 arcsec e_DEs [0.02/0.8] Error in DEs
41- 41 A1 --- theta [HL] Position from H=0.66" resolution,
otherwise L=3" resolution
43- 47 F5.2 --- g0 [0.2/1] Normalized gain at source position
49- 56 F8.2 uJy/beam SLP [4/855] Peak brightness at 3" resolution
58- 63 F6.2 uJy/beam e_SLP [1/4.4] Error in SLP
65- 71 F7.2 uJy SL [4/855] Flux density at 3" resolution
73- 78 F6.2 uJy e_SL [1/26] Error in SL
80- 87 F8.2 arcsec L-H [0.01/18.5] Separation between 3"
source & nearest at 0.66"
89- 96 F8.2 uJy/beam SHP [2.6/793]? Peak brightness at 0.66" resolution
98-103 F6.2 uJy/beam e_SHP [0.9/4]? Error in SHP
105-112 F8.2 uJy SH [2/802]? Flux density at 0.66" resolution
114-119 F6.2 uJy e_SH [0.8/25]? Error in SH
124-124 A1 --- l_phi Upper limit flag on phi
125-128 F4.2 arcsec phi [0.2/1.7]? Deconvolved FWHM in 0.66" image
130-134 F5.2 arcsec r [0/57] Distance to nearest Spitzer IR source
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Feb-2019