Issue |
A&A
Volume 424, Number 2, September III 2004
|
|
---|---|---|
Page(s) | 409 - 414 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20040524 | |
Published online | 23 August 2004 |
Radio source contamination of the Sunyaev-Zeldovich effect in galaxy clusters
1
INAF – Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy e-mail: dezotti@pd.astro.it
2
International School for Advanced Studies, SISSA/ISAS, via Beirut 2-4, 34014 Trieste, Italy
Received:
25
March
2004
Accepted:
17
May
2004
By cross-correlating the 1.4 GHz FIRST catalog of radio
sources with the Abell cluster catalog we have found an excess
surface density by a factor 5 of radio sources within a
projected distance, rp, of 0.1 Mpc (for
) from the
cluster center. The profile of the excess density can be
described, for
Mpc, by a β-model with a
core radius of
0.70 Mpc and
. The luminosity
function of cluster sources does not show hints of cosmological
evolution over the redshift range (
) covered by our
cluster sample. The mean luminosity function is in excellent
agreement with the recent determination by Reddy & Yun ([CITE]) for
7 nearby clusters and extends it by two orders of magnitude to
higher luminosities. Its shape is very similar to that of the
local luminosity function of field galaxies, but the space density
is about 3000 times higher. When extrapolated to 30 GHz, our
luminosity function compares very favourably with an estimate
obtained directly from the 30 GHz observations by Cooray et al.
([CITE]). The antenna temperature contributed by radio sources
within the nominal cluster radius of
Mpc is estimated to be
13.5 μK at 30 GHz for clusters at
and
decreases to
3.4 μK at
, in the absence
of cosmological evolution; it increases by a factor of
1.5 within 0.25 Mpc from the cluster center. If the pure
luminosity evolution models by Dunlop & Peacock ([CITE]) are
adopted, the radio source antenna temperature turns out to be
essentially independent of redshift.
Key words: cosmology: cosmic microwave background / galaxies: clusters: general / radio continuum: galaxies
© ESO, 2004
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