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Date and Time of the Query: 2019-07-19 T18:15:22 PDT
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For refcode 2000ApJ...533L..93B:
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2000ApJ...533L..93B Detecting the Gravitational Redshift of Cluster Gas Tom Broadhurst European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching bei Munchen, D-85748, Germany and Evan Scannapieco Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720-3411 Received 1999 December 20; accepted 2000 March 6; published 2000 March 30 ABSTRACT We examine the gravitational redshift of radiation emitted from within the potential of a cluster. Spectral lines from the intracluster medium (ICM) are redshifted in proportion to the emission-weighted mean potential along the line of sight, amounting to ~50 km s^-1^ at a radius of 100 kpc h^-1^, for a cluster dispersion of 1200 km s^-1^. We show that the relative redshifts of different ionization states of metals in the ICM provide a unique probe of the three-dimensional matter distribution. An examination of the reported peculiar velocities of cD galaxies in well-studied Abell clusters reveals that they are typically redshifted by an average of ~200 km s^-1^. This can be achieved by gravity with the addition of a steep central potential associated with the cD galaxy. Note that, in general, gravitational redshifts cause a small overestimate of the recessional velocities of clusters by an average of ~20 km s^-1^. Subject headings: cosmology: observations-galaxies: clusters: general- techniques: spectroscopic-X-rays: galaxies
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