Removing point sources from CMB maps

Details Removing point sources from CMB maps Removing point sources from CMB maps

1998-02-11

arxiv.org/abs/astro-ph/9802123v2

Astrophys.J.500:L83-L86,1998

Astronomy and Astrophysics

Astrophysics

4 pages, with 2 figures included. Minor revisions to match accepted version. Color figure and links at http://www.sns.ias.edu/

Scientific paper

10.1086/311410

For high-precision cosmic microwave background (CMB) experiments, contamination from extragalactic point sources is a major concern. It is therefore useful to be able to detect and discard point source contaminated pixels using the map itself. We show that the sensitivity with which this can be done can often be greatly improved (by factors between 2.5 and 18 for the upcoming Planck mission) by a customized hi-pass filtering that suppresses fluctuations due to CMB and diffuse galactic foregrounds. This means that point source contamination will not severely degrade the cleanest Planck channels unless current source count estimates are off by more than an order of magnitude. A catalog of around 40,000 far infra-red sources at 857 GHz may be a useful by-product of Planck.

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