NED Abstract 
Copyright by American Astronomical Society.
Reproduced by permission

2010ApJS..188..178M

Very Large Array 1.4 GHz Observations of the GOODS-North Field: Data
Reduction and Analysis

Morrison, Glenn E.; Owen, Frazer N.; Dickinson, Mark; Ivison, Rob J.; Ibar,
Edo

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 ~3.9
{mu}Jy beam^-1^ near its center and ~8 {mu}Jy beam^-1^ at 15' from phase
center. We have cataloged 1230 discrete radio emitters, within a 40' x 40'
region, above a 5{sigma} detection threshold of ~20 {mu}Jy 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 1.4 GHz (20 cm) source counts with those
from other published radio surveys. Our differential counts are nearly
Euclidean below 100 {mu}Jy 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 1 {mu}Jy. If the Euclidean slope of the
counts continues down to the natural confusion limit as an extrapolation
of our log N-log S, this indicates that the cutoff must be fairly sharp
below 1 {mu}Jy else the cosmic microwave background temperature would
increase above 2.7 K at 1.4 GHz. 

Key words: cosmology: observations, galaxies: evolution, galaxies:
starburst, infrared: galaxies