Issue |
A&A
Volume 407, Number 3, September I 2003
|
|
---|---|---|
Page(s) | 845 - 854 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20030991 | |
Published online | 17 November 2003 |
Stacking clusters in the ROSAT All-Sky Survey
Max-Planck-Institut für Astrophysik, PO Box 1317, 85741 Garching, Germany
Corresponding author: M.Bartelmann, msb@mpa-garching.mpg.de
Received:
2
October
2002
Accepted:
25
June
2003
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
© ESO, 2003
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