Distant cooling flows

Details Distant cooling flows Distant cooling flows

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385...49d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 49-60. Research supported by Smithsonian Institution

Astronomy and Astrophysics

Astrophysics

76

Cooling Flows (Astrophysics), Galactic Clusters, Red Shift, X Ray Sources, H Alpha Line, Mass Flow, Sky Surveys (Astronomy)

Scientific paper

Detections of luminous extended H-alpha emission in 14 distant X-ray-selected clusters of galaxies with redshifts ranging between 0.07 and 0.37 are reported. Eleven of these detections are from a complete flux-limited sample of 23 clusters extracted from the Einstein Extended Medium-Sensitivity Survey (EMSS). The H-alpha detections indicate the presence of cool gas embedded within hotter, X-ray-emitting cluster gas, a signature of a massive cooling flow. The X-ray and optical properties of these distant cooling flows are found to be similar to cooling flows found nearby (redshift value less than 0.1). If extended H-alpha emission is an unbiased indicator of a cooling flow, the fraction of X-ray-emitting clusters that possess massive cooling flows has decreased by a factor of about 2 since a redshift value of 0.3. The EMSS is rich in distant cooling flow clusters, not because of a selection effect as previously suggested but because cooling flow clusters comprised a large percentage of X-ray-emitting clusters in the past.

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