J/MNRAS/462/2934 Lockman Hole North 3GHz catalogue (Vernstrom+, 2016)
Deep 3-GHz Observations of the Lockman Hole North with the Very Large Array.
II. Catalogue and uJy source properties.
Vernstrom T.S., Scott D., Wall J.V., Condon J.J., Cotton W.D.,
Kellermann K.I., Perley R.A.
<Mon. Not. R. Astron. Soc. 462, 2934 (2016)>
=2016MNRAS.462.2934V 2016MNRAS.462.2934V (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources ; Cross identifications ; Redshifts
Keywords: methods: data analysis - surveys - cosmology: observations -
radio continuum: galaxies
Abstract:
This is the second of two papers describing the observations and
source catalogues derived from sensitive $3$-GHz images of the Lockman
Hole North using the Karl G. Jansky Very Large Array. We describe the
reduction and cataloguing process, which yielded an image with
8-arcsec resolution and instrumental noise of σ_n=1.01uJy/beam
rms (before primary beam corrections) and a catalogue of 558 sources
detected above 5σ_n. We include details of how we estimate
source spectral indices across the 2GHz VLA bandwidth, finding a
median index of -0.76±0.04. Stacking of source spectra reveals a
flattening of spectral index with decreasing flux density. We present
a source count derived from the catalogue. We show a traditional count
estimate compared with a completely independent estimate made via a
P(D) confusion analysis, and find very good agreement. Cross-matches
of the catalogue with X-ray, optical, infrared, radio, and redshift
catalogues are also presented. The X-ray, optical and infrared data,
as well as AGN selection criteria allow us to classify 10 per cent as
radio-loud AGN, 28 percent as radio-quiet AGN, and 58 per cent as
star-forming galaxies, with only 4 per cent unclassified.
Description:
Observations were made with the VLA in the C configuration at S band,
with a frequency range of 2 to 4GHz, with a total of roughly 50 hours
of on source time in 2012.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cat3ghz.dat 143 558 3GHz source catalog
catcrx.dat 223 558 X-ray, optical, IR, and radio cross matches
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See also:
II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
V/139 : SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
J/ApJS/185/433 : SWIRE/Chandra survey in Lockman Hole Field (Wilkes+, 2009)
J/ApJ/714/1305 : The Deep SWIRE Field (DSF) IV. (Strazzullo+, 2010)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
Byte-by-byte Description of file: cat3ghz.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- ID IAU catalogue designation
(TV16JHHMMSSs+DDMMSS)
20- 21 I2 h RAh Right Ascension (J2000)
23- 24 I2 min RAm Right Ascension (J2000)
26- 30 F5.2 s RAs Right Ascension (J2000)
32- 35 F4.2 s e_RAs Uncertainty in Right Ascension
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 51 F3.1 arcsec e_DEs Uncertainty in Declination
53- 56 F4.2 GHz nueff Effective frequency in wideband image
58- 60 F3.1 --- PB Primary beam correction factor
62- 67 F6.1 uJy/beam Speak Peak flux density (1)
69- 74 F6.1 --- SNR Signal-to-noise ratio
76- 79 I4 uJy Stot Total corrected flux density
81- 84 F4.1 uJy e_Stot Uncertainty in total flux density
86 I1 --- fsize [0/4] Size flag (2)
88- 92 F5.2 arcsec maj Fitted beam-convolved major axis size
94- 97 F4.2 arcsec e_maj Uncertainty in major axis
99-102 F4.1 arcsec majde ? Deconvolved major axis size
104-106 F3.1 arcsec e_majde ? Uncertainty in deconvolved major axis
108 A1 --- l_maj [<] Axis is less than 2sigma > the beam
110-114 F5.2 arcsec min Fitted beam-convolved minor axis size
116-119 F4.2 arcsec e_min Uncertainty in minor axis
121-124 F4.1 arcsec minde ? Deconvolved minor axis size
126-128 F3.1 arcsec e_minde ? Uncertainty in deconvolved minor axis
130 A1 --- l_min [< ] Axis is less than 2sigma > the beam
132-134 I3 deg PA ? Fitted position angle
136-139 F4.1 --- Sp+Index ? Spectral index from 2 to 4GHz (3)
141-143 F3.1 --- e_Sp+Index ? Spectral index uncertainty
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Note (1): In units of microJanskys/beam and uncorrected for primary beam.
Note (2): Size flag indicates type of source with the following definitions:
0 = complex or multi-component source
1 = resolved
2 = partially resolved
3 = possibly resolved
4 = unresolved
Note (3): Only sources with uncertainty in SI<0.4 and/or -2.25<SI<2.25
are reported.
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Byte-by-byte Description of file: catcrx.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- ID IAU catalogue designation (TV16JHHMMSSs+DDMMSS)
20- 23 I4 uJy S3ghz 3GHz total flux density
25- 26 I2 h RAh Right Ascension (J2000)
28- 29 I2 min RAm Right Ascension (J2000)
31- 35 F5.2 s RAs Right Ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 56 E8.2 mW/m2 XrayBr ? Chandra 0.3-8.0keV flux
(Wilkes et al., 2009, Cat. J/ApJS/185/433)
58- 65 E8.2 mW/m2 XrayH ? Chandra 2.5-8.0keV flux
(Wilkes et al., 2009, Cat. J/ApJS/185/433)
67- 71 F5.2 mag umagS ? SDSS DR9 u magnitude (AB)
(Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat. V/139)
73- 77 F5.2 mag gmagS ? SDSS DR9 g magnitude (AB)
(Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat. V/139)
79- 83 F5.2 mag rmagS ? SDSS DR9 r magnitude (AB)
(Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat. V/139)
85- 89 F5.2 mag imagS ? SDSS DR9 i magnitude (AB)
(Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat. V/139)
91- 95 F5.2 mag zmagS ? SDSS DR9 z magnitude (AB)
(Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat. V/139)
97-101 F5.2 mag umagK ? KPNO u magnitude (AB)
(Gonzalez-Solares et al., 2011MNRAS.416..927G 2011MNRAS.416..927G)
103-107 F5.2 mag gmagK ? KPNO g magnitude (AB)
(Gonzalez-Solares et al., 2011MNRAS.416..927G 2011MNRAS.416..927G)
109-113 F5.2 mag rmagK ? KPNO r magnitude (AB)
(Gonzalez-Solares et al., 2011MNRAS.416..927G 2011MNRAS.416..927G)
115-119 F5.2 mag imagK ? KPNO i magnitude (AB)
(Gonzalez-Solares et al., 2011MNRAS.416..927G 2011MNRAS.416..927G)
121-125 F5.2 mag Jmag ? UKIDSS DR9 J magnitude
(Lawrence et al., 2012, Cat. II/314)
127-131 F5.2 mag Kmag ? UKIDSS DR9 K magnitude
(Lawrence et al., 2012, Cat. II/314)
133-138 F6.2 uJy S3.6umSW ? Spitzer/SWIRE 3.6um flux
(Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L)
140-145 F6.2 uJy S4.5umSW ? Spitzer/SWIRE 4.5um flux
(Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L)
147-152 F6.2 uJy S5.8umSW ? Spitzer/SWIRE 5.8um flux
(Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L)
154-160 F7.2 uJy S8.0umSW ? Spitzer/SWIRE 8.0um flux
(Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L)
162-167 F6.2 uJy S3.6umSE ? Spitzer/SERVS 3.6um flux
(Mauduit et al., 2012PASP..124..714M 2012PASP..124..714M)
169-174 F6.2 uJy S4.5umSE ? Spitzer/SERVS 4.5um flux
(Mauduit et al., 2012PASP..124..714M 2012PASP..124..714M)
176-182 F7.2 uJy S24um ? Spitzer/MIPS 24um flux
(Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L)
184-188 F5.2 uJy S250um ? Herschel/Hermes DR3 250um flux
(Oliver et al., 2012, Cat. VIII/95)
190-194 F5.2 uJy S350um ? Herschel/Hermes DR3 350um flux
(Oliver et al., 2012, Cat. VIII/95)
196-200 F5.2 uJy S500um ? Herschel/Hermes DR3 500um flux
(Oliver et al., 2012, Cat. VIII/95)
202-208 F7.1 uJy S20cm ? VLA 1.4GHz flux
(Owen & Morrison, 2008, Cat. J/AJ/136/1889)
210-213 I4 uJy S90cm ? VLA 325MHz flux
(Owen et al., Cat. J/AJ/137/4846)
215-218 F4.2 --- zsp ? Spectroscopic redshift
(Rowan-Robinson et al., 2008, Cat. II/290;
Strazzullo et al., Cat. J/ApJ/714/1305)
220-223 F4.2 --- zph ? Photometric redshift
(Rowan-Robinson et al., 2008, Cat. II/290;
Strazzullo et al., Cat. J/ApJ/714/1305)
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Acknowledgements:
Tessa Vernstrom, vernstrom(at)dunlap.utoronto.ca
References:
Vernstrom et al., Paper I 2016MNRAS.461.2869V 2016MNRAS.461.2869V
History:
* 30-Aug-2016: on-line version
* 19-Jul-2019: corrected version, from author
(End) Tessa Vernstrom [Univ. of Toronto], Patricia Vannier [CDS] 29-Aug-2016