Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..177e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 177-188. Research support
Astronomy and Astrophysics
Astrophysics
230
Cooling Flows (Astrophysics), Galactic Clusters, Mass Flow Rate, X Ray Astronomy, Galactic Evolution, X Ray Imagery
Scientific paper
We present an analysis of the mass-flow rates of cooling flows in an X-ray flux-limited sample of clusters of galaxies in which most of the clusters were observed with both imaging and spectroscopic detectors. Using high-quality images and constraints from broad-band spectra, we find that the fraction of clusters with central cooling times less than the Hubble time is high (at least 70 percent and possibly 90 percent), indicating that cooling flows are a common and long-lived phenomenon. We also determine the fraction of cooling flows with optical line emission and the space density of clusters as a function of the mass flow rate. The clusters that are not cooling flows are apparently recent mergers and contain radio halo sources. We investigate the impact of cluster evolution through mergers on the evolution of the mass flow rate in four well-studied cooling flows.
Edge Alastair C.
Fabian Andrea C.
Stewart Gordon C.
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