The [ITAL]L[/ITAL][TINF]X[/TINF]-σ Relation for Galaxies and Clusters of Galaxies
- 20 June 2001
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 554 (2) , L129-L132
- https://doi.org/10.1086/321710
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.Keywords
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