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Date and Time of the Query: 2019-07-17 T13:21:52 PDT
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For refcode 1992ApJ...386..408H:
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Copyright by American Astronomical Society. Reproduced by permission
1992ApJ...386..408H THE EXTENDED MEDIUM SENSITIVITY SURVEY DISTANT CLUSTER SAMPLE: X-RAY DATA AND INTERPRETATION OF THE LUMINOSITY EVOLUTION J. P. HENRY, I. M. GIOIA, T. MACCACARO, S. L. MORRIS, J. T. STOCKE, AND A. WOLTER Received 1991 May 10; accepted 1991 August 28 ABSTRACT We describe the X-ray properties of a cluster of galaxies subsample of the Einstein Extended Medium Sensitivity Survey. A summary of this sample and its implications has been presented previously; this paper gives the full details. The cluster subsample is 98.4% identified and contains 93 X-ray-selected clusters to a redshift of 0.58. We derive the cluster X- ray luminosity function at three cosmic epochs. While our luminosity function agrees with previous determinations at the lowest redshifts, we find that the volume density of high-luminosity clusters is greater now than it was in the past. The normalization, shape, and time dependence of the luminosity function can be described by a simple hierarchical formation model with parameters which also describe the temperature function of an independent sample of low-redshift clusters. In this model the comoving hot gas density remains constant with time at least to redshifts of order 0.35. Subject headings: galaxies: clustering - galaxies: evolution - galaxies: luminosity function, mass function - surveys - X-rays: galaxies
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