Max Tegmark's library: cleaning
Figure: The filter for finding point sources is plotted in real
space (left) and Fourier space (right)
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Removing point sources from CMB maps
Max Tegmark & Angelica
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.
ApJ Lett., 500, L83-L86 (1998)
This site also contains the latest (non-astro/ph) versions of some papers
that are referenced in the text; de
Oliveira-Costa et al 1997, Tegmark & Efstathiou
1996 (TE96), Tegmark & Villumsen 1997,
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This page was last modified July 16, 1998.