Temperature and Dark Matter profiles of Galaxy Groups
Abstract
The Chandra and XMM data for a sample of 19 relaxed groups/poor clusters, covering the temperature range 1-3 keV and selected to have the best available data, reveal a remarkable similarity in their temperature profile: cool cores outside of which the temperatures reach a peak for radii less than 0.1 of the virial radius and then decline. We fitted the derived mass profiles using an NFW model, which provides a good fit to the data when accounting for the central galaxy in the inner region. The concentration parameters and virial masses are in the range c = 5-22 and M = 2 x 10^13 - 4 x 10^14 solar masses, in general agreement with the concentrations found in numerical simulations.
Cite
@article{arxiv.astro-ph/0510592,
title = {Temperature and Dark Matter profiles of Galaxy Groups},
author = {F. Gastaldello and D. Buote and P. Humphrey and L. Zappacosta and J. Bullock and F. Brighenti and W. Mathews},
journal= {arXiv preprint arXiv:astro-ph/0510592},
year = {2007}
}
Comments
2 pages, to appear in the proceedings for the conference "The X-ray Universe 2005", San Lorenzo del Escorial, Madrid; typo in one reference corrected