Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A ROSAT study of the cores of clusters of galaxies - I. Cooling flows in
  an X-ray flux-limited sample   This is the first part of a study of the detailed X-ray properties of the
cores of nearby clusters. We have used the flux-limited sample of 55 clusters
of Edge et al. (1990) and archival and proprietary data from the {\it ROSAT}
observatory. In this paper an X-ray spatial analysis based on the
surface-brightness-deprojection technique is applied to the clusters in the
sample with the aim of studying their cooling flow properties. We determine the
fraction of cooling flows in this sample to be 70-90 percent and estimate the
contribution of the flow region to the cluster X-ray luminosity. We show that
the luminosity within a strong cooling flow can account for up to 70 percent of
a cluster X-ray bolometric luminosity. Our analysis indicates that about 40
percent of the clusters in the sample have flows depositing more than 100
\Msunpyr throughout the cooling region and that these possibly have been
undisturbed for many Gyr, confirming that cooling flows are the natural state
of cluster cores. New cooling flows in the sample are presented and previously
ambiguous ones are clarified. We have constructed a catalogue of some
intracluster medium properties for the clusters in this sample. The profiles of
the mass deposited from cooling flows are analyzed and evidence presented for
the existence of breaks in some of the profiles. Comparison is made to recent
optical and radio data. We cross-correlate our sample with the Green Bank, NVSS
and FIRST surveys and to the volume-limited sample of brightest cluster
galaxies presented by Lauer and Postman (1994). Although weak trends exist, no
strong correlation between optical magnitude or radio power of the brightest
cluster galaxy and the strength of the flow is found.

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
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The categories of this paper are: eess
30
The categories of this paper are: q-alg