The Discovery of Quasisoft and Supersoft Sources in External Galaxies
Astrophysics
2009-11-10 v2
Abstract
We apply a uniform procedure to select very soft sources from point sources observed by Chandra in 4 galaxies. This sample includes one elliptical galaxy (NGC 4967), 2 face-on spirals (M101 and M83), and an interacting galaxy (M51). We have found very soft X-ray sources (VSSs) in every galaxy. Some of these fit the criteria for canonical supersoft sources (SSSs), while others are somewhat harder. These latter have characteristic values of kT < 300 eV; we refer to them as quasisoft sources (QSSs). We found a combined total of 149 VSSs in the 4 galaxies we considered; 77 were SSSs and 72 were QSSs. (See the paper for the original long abstract)
Cite
@article{arxiv.astro-ph/0311375,
title = {The Discovery of Quasisoft and Supersoft Sources in External Galaxies},
author = {R. Di Stefano and A. K. H. Kong},
journal= {arXiv preprint arXiv:astro-ph/0311375},
year = {2009}
}
Comments
20 pages, 6 figures. Accepted for publication in ApJ