Issue |
A&A
Volume 423, Number 1, August III 2004
|
|
---|---|---|
Page(s) | 21 - 26 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20040167 | |
Published online | 29 July 2004 |
A halo approach to the evaluation of the cross-correlation between the SZ sky and galaxy surveys
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China e-mail: quyan@class2.bao.ac.cn
Received:
17
February
2003
Accepted:
19
February
2004
Using a purely analytic approach to gaseous and dark matter halos,
we study the cross-correlation between the Sunyaev-Zel'dovich (SZ)
sky and galaxy surveys under flat sky approximation,
in an attempt to acquire the redshift information
of the SZ map. The problem can be greatly simplified when it
is noticed that the signals of the SZ–galaxy correlation
arise only from hot gas and galaxies inside the same
massive halos (i.e. clusters), and that field galaxies
make almost no contribution to the cross-correlation.
Under the assumption that both the hot gas and galaxies trace
the common gravitational potential of dark halos,
we calculate the expected cross SZ–galaxy power spectra
for the WMAP/Planck SZ maps and the SDSS galaxy sample
at small scales .
It turns out, however, that it is not presently feasible to
measure such small angular cross power spectra because
of the high noise levels at
in the WMAP/Planck experiments.
Future SZ observations with better angular resolutions and
sufficiently wide sky coverage
will be needed if this technique is to be applied for the
statistical measurement of the redshift distribution of the SZ sources.
Key words: cosmology: theory / cosmology: cosmic microwave background / cosmology: large-scale structure of Universe
© ESO, 2004
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