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Date and Time of the Query: 2018-11-17 T11:17:40 PST
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For refcode 1995ApJ...449..422H:
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Copyright by American Astronomical Society. Reproduced by permission
1995ApJ...449..422H GROUPS OF GALAXIES IN THE ROSAT NORTH ECLIPTIC POLE SURVEY J. P. HENRY Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822 I. M. GIOIA Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822; and Istituto di Radioastronomia CNR J. P. HUCHRA Harvard-Smithsotuan Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 R. BURG Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; and Space Telescope Science Institute B. MCLEAN Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 H. BOHRINGER, R. G. BOWER, U. G. BRIEL, AND W. VOGES Max-Planck-Institut Fur Extraterrestrische Physik, 85740 Garching bei Munchen, Germany H. MACGILLIVRAY Royal Observatory Edinburgh, Edinburgh EH9 3HJ, Scotland, UK AND R. G. CRUDDACE Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375 Received 1994 October 14; accepted 1995 February 28 ABSTRACT We present the first measurement of the ensemble properties of X- ray-selected groups of galaxies. Their X-ray luminosity and temperature functions are a smooth extrapolation from rich clusters of galaxies. The X-ray-selected groups have a spiral fraction which is about a factor of 2 smaller than optically selected groups, possibly because the X-ray selection produces a more dynamically evolved sample. The binding masses of these groups and their contribution to the density of the universe is typical of those found from analyses of optically selected samples, but our estimates were derived from completely different selection criteria and mass measurements. Subject headings: cosmology: theory - galaxies: statistics - surveys - X- rays: galaxies
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