NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-23 T08:21:53 PDT
Help | Comment | NED Home

For refcode 1994AJ....107..427D:
Retrieve 138 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1994AJ....107..427D X-RAY AND OPTICAL PROPERTIES OF GROUPS OF GALAXIES IAN P. DELL'ANTONIO, MARGARET J. GELLER, AND DANIEL G. FABRICANT Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: dell:torva@cfa.harvard.edu, mjg@cfa.harvard.edu, fabricant@cfa.harvard.edu Received 1993 September 3: revised 1993 September 28 ABSTRACT We have measured 125 redshifts in 31 groups of galaxies observed with Einstein, and have compiled an additional 543 redshifts from the literature. There is a correlation between galaxy surface density and group velocity dispersion, with {mu} is proportional to {sigma}^1.6+/- 0.6^, but the scatter about this relation is large. We examine the relationship between the group x-ray luminosity in the 0.3-3.5 keV band and the measured velocity dispersion. Richer groups follow the same relation as rich clusters [cf. Quintana & Melnick, Al, 87,972 (1982)] with L_x_ is proportional to {sigma}^4.0+/-0.6^, but the relation flattens for lower luminosity systems which have velocity dispersions below 300 km s^-1^. We suggest that the L_x_-{sigma} relation arises from a combination of extended cluster emission and emission associated with individual galaxies. The x-ray emission for the richer groups is dominated by emission from the intragroup medium, as for the richer clusters; emission from the poorer clusters is dominated by less extended emission associated with the individual group galaxies. ========================================================================= 1994AJ....108.1121D ERRATUM: "X-RAY AND OPTICAL PROPERTIES OF GROUPS OF GALAXIES" [AJ, 107, 427 (1994)] IAN P. DELL'ANTON1O, MARGARET J. GELLER, AND DANIEL G. FABRICANT Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: dellantonio@cfa.harvard.edu, mjg@cfa.harvard.edu, fabricant@cfa.harvard.edu We have discovered several errors in the equations in the paper [AJ, 107,427(1994)] which appeared in the February 1 issue of the Astronomical Journal. The corrections are: See Journal.
Retrieve 138 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home