Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimates of unresolved point sources contribution to WMAP 5   We present an alternative estimate of the unresolved point source
contribution to the WMAP temperature power spectrum based on current knowledge
of sources from radio surveys in the 1.4-90 GHz range. We implement a
stochastic extrapolation of radio point sources in the NRAO-VLA Sky Survey
(NVSS) catalog, from the original 1.4 GHz to the ~ 100 GHz frequency range
relevant for CMB experiments. With a bootstrap approach, we generate an
ensemble of realizations that provides the probability distribution for the
flux of each NVSS source at the final frequency. The predicted source counts
agree with WMAP results for S > 1 Jy and the corresponding sky maps correlate
with WMAP observed maps in Q-, V- and W- bands, for sources with flux S > 0.2
Jy. The low-frequency radio surveys found a steeper frequency dependence for
sources just below the WMAP nominal threshold than the one estimated by the
WMAP team. This feature is present in our simulations and translates into a
shift of 0.3-0.4 \sigma in the estimated value of the tilt of the power
spectrum of scalar perturbation, n_s, as well as \omega_c. This approach
demonstrates the use of external point sources datasets for CMB data analysis.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat