The Discovery of Quasisoft and Supersoft Sources in External Galaxies

Details The Discovery of Quasisoft and Supersoft Sources in External Galaxies The Discovery of Quasisoft and Supersoft Sources in External Galaxies

2003-11-17

arxiv.org/abs/astro-ph/0311375v2

Astrophys.J. 609 (2004) 710-727

Astronomy and Astrophysics

Astrophysics

20 pages, 6 figures. Accepted for publication in ApJ

Scientific paper

10.1086/421318

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)

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