Issue |
A&A
Volume 420, Number 1, June II 2004
|
|
---|---|---|
Page(s) | 61 - 74 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20035597 | |
Published online | 14 May 2004 |
Detection of X-ray clusters of galaxies by matching RASS photons and SDSS galaxies within GAVO*
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85741 Garching, Germany
Corresponding author: P. Schuecker, peters@mpe.mpg.de
Received:
30
October
2003
Accepted:
3
March
2004
A new method for a simultaneous search for clusters of
galaxies in X-ray photon maps and optical galaxy maps is
described. The merging of X-ray and optical data improves the source
identification so that a large amount of telescope time for
spectroscopic follow-up can be saved. The method appears thus ideally
suited for the analysis of the recently proposed wide-angle X-ray
missions like DUO and ROSITA. As a first application, clusters are
extracted from the 3rd version of the ROSAT All-Sky Survey and the
Early Date Release of the Sloan Digital Sky Survey (SDSS). The
time-consuming computations are performed within the German
Astrophysical Virtual Observatory (GAVO). On a test area of 140 square degrees, 75 X-ray clusters are detected down to an X-ray flux limit of
in the
ROSAT energy band 0.1–2.4 keV. The clusters have redshifts
. The survey thus fills the gap between traditional large-area
X-ray surveys and serendipitous X-ray cluster searches based on
pointed observations, and has the potential to yield about 4000 X-ray
clusters after completion of SDSS.
Key words: galaxies: clusters: general / methods: statistical
© ESO, 2004
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