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Date and Time of the Query: 2019-07-18 T13:50:18 PDT
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For refcode 1994A&A...284L..31S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...284L..31S Letter to the Editor A Faber-Jackson relation for clusters of galaxies: implications for modified dynamics R. H. Sanders Kapteyn Astronomical Institute, University of Groningen, NL-9700 AV Groningen, The Netherlands Received 9 December 1993/Accepted 11 March 1994 Abstract. In a sample of 20 rich clusters of galaxies, the mass of the hot X-ray emitting gas is correlated with the square of the gas temperature Because the hot intra-cluster gas comprises most of the baryonic mass in rich clusters, this correlation implies a mass-velocity dispersion relation of the form seen in elliptical galaxies- the Faber- Jackson relation. Indeed, within the errors and uncertainty in the Hubble parameter, clusters appear to lie on the high mass extention of the Faber-Jackson relation for ellipticals. Although this result is difficult to understand in terms of conventional scenarios for structure formation, it is a direct consequence of Milgrom's modified dynamics (MOND). Applying Milgrom's mass-temperature relation for isothermal spheres to this sample of clusters, one finds agreement between the predicted and observed gas masses to within a factor of two. Key words: Galaxies: clustering - X-rays: clusters of galaxies - dark matter
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