The LX-sigma Relation for Galaxies and Clusters of Galaxies
Abstract
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 ~ sigma^4.4 and LX ~ sigma^10, 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.
Cite
@article{arxiv.astro-ph/0105315,
title = {The LX-sigma Relation for Galaxies and Clusters of Galaxies},
author = {Andisheh Mahdavi and Margaret J. Geller},
journal= {arXiv preprint arXiv:astro-ph/0105315},
year = {2009}
}
Comments
11 pages, including 2 tables and 2 figures. Accepted for publication in The Astrophysical Journal Letters; the Letters version excludes Table 1, which is available in ASCII format at http://tdc-www.harvard.edu/lxsigma