Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel multi-frequency technique for the detection of point sources in
  Cosmic Microwave Background maps   In this work we address the problem of simultaneous multi-frequency detection
of extragalactic point sources in maps of the Cosmic Microwave Background. We
apply a new linear filtering technique, the so called `matched matrix filters',
that incorporates full spatial information, including the cross-correlation
among channels, without making any a priori assumption about the spectral
behaviour of the sources. A substantial reduction of the background is achieved
thanks to the optimal combination of filtered maps. We describe in detail the
new technique and we apply it to the detection/estimation of radio sources in
realistic all-sky Planck simulations at 30, 44, 70 and 100 GHz. Then we compare
the results with the mono-frequential approach based on the standard matched
filter, in terms of reliability, completeness and flux accuracy of the
resulting point source catalogs. The new filters outperform the standard
matched filters for all these indexes at 30, 44 and 70 GHz, whereas at 100 GHz
both kind of filters have a similar performance. We find a noticeable increment
of the number of true detections for a fixed reliability level. In particular,
for a 95% reliability we practically double the number of detections at 30, 44
and 70 GHz.

21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th