Issue |
A&A
Volume 423, Number 2, August IV 2004
|
|
---|---|---|
Page(s) | 449 - 467 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20035818 | |
Published online | 06 August 2004 |
RASS-SDSS Galaxy clusters survey*
I. The catalog and the correlation of X-ray and optical properties
1
Max-Planck-Institut fur extraterrestrische Physik, 85748 Garching, Germany e-mail: popesso@mpe.mpg.de
2
Apache Point Observatory, PO Box 59, Sunspot, NM 88349, USA
3
Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
Received:
8
December
2003
Accepted:
4
March
2004
For a detailed comparison of the appearance of cluster of galaxies in
X-rays and in the optical, we have compiled a comprehensive database
of X-ray and optical properties of a sample of clusters based on the
largest available X-ray and optical surveys: the ROSAT All Sky Survey
(RASS) and the Sloan Digital Sky Survey (SDSS). The X-ray galaxy
clusters of this RASS-SDSS catalog cover a wide range of masses, from
groups of to massive clusters of 1015
in the redshift range 0.002-0.45. The RASS-SDSS sample
comprises all the X-ray selected objects already observed by the Sloan
Digital Sky Survey (114 clusters). For each system we have uniformly
determined the X-ray (luminosity in the ROSAT band, bolometric
luminosity, center coordinates) and optical properties (Schechter
luminosity function parameters, luminosity, central galaxy density,
core, total and half-light radii). For a subsample of 53 clusters we
have also compiled the temperatures and the iron abundances from the
literature. The total optical luminosity can be determined with a
typical uncertainty of 20% independent of the choice of local or
global background subtraction. We searched for parameters which
provide the best correlation between the X-ray luminosity and the
optical properties and found that the z band luminosity determined
within a cluster aperture of 0.5 Mpc
provides the
best correlation, with a scatter of about 60-70%. The scatter
decreases to less than 40% if the correlation is limited to the
bright X-ray clusters. The resulting correlation of LX and
Lop in the z and i bands shows a logarithmic slope of 0.38, a
value not consistent with the assumption of a constant M/L.
Consistency is found, however, for an M/L increasing with luminosity
as suggested by other observations. We also investigated the
correlation between Lop and the X-ray temperature, obtaining the
same result.
Key words: galaxies: clusters: general / galaxies: luminosity function, mass function / methods: observational
© ESO, 2004
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