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J/ApJS/188/178 VLA 1.4GHz observations of the GDSN field (Morrison+, 2010)
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Beginning of ReadMe :J/ApJS/188/178 VLA 1.4GHz observations of GOODS-North field (Morrison+, 2010)
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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
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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 5sigma 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.