Detection of new point sources in WMAP 7 year data using internal
  templates and needlets
  We have developed a new needlet based method to detect point sources in
cosmic microwave background (CMB) maps and have applied it to the WMAP 7 year
data. We use both the individual frequency channels as well as internal
templates, the difference between pairs of frequency channels, with the
advantage that the CMB component is eliminated. Using the area of the sky
outside the Kq85 galactic mask, we detect a total of 2102 point sources at the
$5\sigma$ level in either the frequency maps or the internal templates. Of
these, 1116 are detected either at $5\sigma$ directly in the frequency channels
or at $5\sigma$ in the internal templates and $\geq3\sigma$ at the
corresponding position in the frequency channels. Of the 1116 sources, 603 are
detections which have not been reported so far in WMAP data. We have made a
catalogue of these sources available with position and flux estimated in the
WMAP channels where they are seen. In total, we identified 1029 of the 1116
sources with counterparts at 5GHz and 69 at other frequencies.
