A&A 407, 845-854 (2003)
DOI: 10.1051/0004-6361:20030991
Stacking clusters in the ROSAT All-Sky Survey
M. Bartelmann and S. D. M. WhiteMax-Planck-Institut für Astrophysik, PO Box 1317, 85741 Garching, Germany
(Received 2 October 2002 / Accepted 25 June 2003)
Abstract
Ongoing and planned wide-area surveys at optical and infrared
wavelengths should detect a few times
105 galaxy clusters,
roughly
of which are expected to be at redshifts
0.8. We investigate what can be learned about the X-ray
emission of these clusters from the ROSAT All-Sky Survey. While
individual clusters at redshifts
0.5 contribute at most a
few photons to the survey, a significant measurement of the mean
flux of cluster subsamples can be obtained by stacking cluster
fields. We show that the mean X-ray luminosity of clusters with mass
selected from the Sloan
Digital Sky Survey should be measurable out to redshift unity with
signal-to-noise
10, even if clusters are binned with
and
. For such bins, a suitably
chosen hardness ratio allows the mean temperature of clusters to be
determined out to
with a relative accuracy of
for
.
Key words: surveys -- galaxies: clusters: general -- X-rays: galaxies
Offprint request: M.Bartelmann, msb@mpa-garching.mpg.de
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