The LX-σ 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-σ) relation. Our samples of 280 clusters and 57 galaxies have LX~σ4.4 and LX~σ10, respectively. This unified LX-σ 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2001
- DOI:
- 10.1086/321710
- arXiv:
- arXiv:astro-ph/0105315
- Bibcode:
- 2001ApJ...554L.129M
- Keywords:
-
- Galaxies: Clusters: General;
- X-Rays: Galaxies;
- Astrophysics
- E-Print:
- 11 pages, including 2 tables and 2 figures. Accepted for publication in The Astrophysical Journal Letters
