The Relationship Between X-ray Luminosity and Velocity Dispersion for Galaxies and Clusters of Galaxies

Details The Relationship Between X-ray Luminosity and Velocity Dispersion for Galaxies and Clusters of Galaxies The Relationship Between X-ray Luminosity and Velocity Dispersion for Galaxies and Clusters of Galaxies

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe...8m&link_type=abstract

Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We demonstrate that individual elliptical galaxies and clusters of galaxies form a continuous X-ray luminosity-velocity dispersion (Lx - Sigma) relation. Our samples of 280 clusters and 57 galaxies have Lx proportional to Sigma4.4 and Lx proportional to Sigma10, respectively. This unified Lx - Sigma relation spans 8 orders of magnitude in Lx and is fully consistent with the observed and theoretical luminosity-temperature scaling laws. Our results SUPport the notion that galaxies and clusters of galaxies are the luminous tracers of similar dark matter halos.

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