J/ApJS/188/178 VLA 1.4GHz observations of GOODS-North field (Morrison+, 2010)
Very Large Array 1.4 GHz observations of the GOODS-North field: data reduction
and analysis.
Morrison G.E., Owen F.N., Dickinson M., Ivison R.J., Ibar E.
<Astrophys. J. Suppl. Ser., 188, 178-186 (2010)>
=2010ApJS..188..178M 2010ApJS..188..178M
ADC_Keywords: Radio sources ; Radio continuum
Keywords: cosmology: observations - galaxies: evolution - galaxies: starburst -
infrared: galaxies
Abstract:
We describe deep, new, wide-field radio continuum observations of the
Great Observatories Origins Deep Survey-North field. The resulting map
has a synthesized beam size of ∼1.7" and an rms noise level of
∼3.9uJy/beam near its center and ∼8uJy/beam at 15' from phase center.
We have cataloged 1230 discrete radio emitters, within a 40'x40'
region, above a 5σ detection threshold of ∼20uJy at the field
center. New techniques, pioneered by Owen & Morrison, have enabled us
to achieve a dynamic range of 6800:1 in a field that has significantly
strong confusing sources. We compare the 1.4GHz (20cm) source counts
with those from other published radio surveys. Our differential counts
are nearly Euclidean below 100uJy with a median source diameter of
∼1.2". This adds to the evidence presented by Owen & Morrison that the
natural confusion limit may lie near 1uJy. If the Euclidean slope of
the counts continues down to the natural confusion limit as an
extrapolation of our logN-logS, this indicates that the cutoff must be
fairly sharp below 1uJy else the cosmic microwave background
temperature would increase above 2.7K at 1.4GHz.
Description:
165hr observations were done at night, for a region centered at
12:36:49.4+62:12:58 (J2000), at 1.4GHz, using the National Radio
Astronomy Observatory's (NRAO's) VLA between 2005 February and
2006 February.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 101 1230 Radio source catalog
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996)
J/MNRAS/358/1159 : Radio sources in HDF and HFF (Muxlow+, 2005)
J/MNRAS/371/963 : Deep VLA survey in Lockman Hole, HDFN, ELAISN2 (Biggs+ 2006)
J/ApJS/167/103 : Radio/Optical catalog of the SSA 13 field (Fomalont+, 2006)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [MOD2010] [1/11103] Catalog Source Number
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19- 23 F5.3 s e_RAs Error in RAs
24 A1 --- DE- Declination sign
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 39 F4.2 arcsec e_DEs Error in DEs
41- 46 F6.1 --- S/N Peak Signal/Noise Ratio
48- 55 F8.1 uJy Sp Observed peak brightness at 1.4GHz (1)
57- 60 F4.1 uJy e_Sp Error in Sp
62- 70 F9.1 uJy Stot Total flux density at 1.4GHz
72- 77 F6.1 uJy e_Stot Error in Stot
79- 83 F5.1 arcsec bmaj Fitted Gaussian major axis FWHM
85- 88 F4.1 arcsec bmin Fitted Gaussian minor axis FWHM
90- 92 I3 deg PA Fitted position angle
94- 97 F4.1 arcsec ulim ?=0 bmaj-upper limit if bmaj=0.0 (2)
99-101 F3.1 arcsec beam Map beam size
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Note (1): In units of microJanskeys/beam and uncorrected for primary beam
or bandwidth smearing.
Note (2): Or maximum size for very resolved sources.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Jun-2010