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Table 3

Properties of the FIRST and NVSS radio continuum surveys.

FIRST NVSS

effective resolution 5′′ 45′′
completeness limit 1 mJya  ~2.5 mJy
positional uncertaintyb  <0.5′′  <1′′
positional uncertaintyc  1′′  ~7′′
total number of sources 816 331d 1 810 6723
sources per square degree  ~90  ~53
area covered (deg2) 9055 33 885

Notes. 

(a)

Catalog detection threshold;

(b)

for the brightest sources;

(c)

at the completeness limit/detection threshold;

(d)

as of July 16, 2008;

(e)

as of February, 2004.

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