The Discovery of Quasi‐soft and Supersoft Sources in External Galaxies
The Discovery of Quasi‐soft and Supersoft Sources in External Galaxies
We apply a uniform procedure to select very soft sources from point sources observed by Chandra in four galaxies. This sample includes one elliptical galaxy (NGC 4967), two face-on spiral galaxies (M101 and M83), and an interacting galaxy (M51). We report on some intriguing results, including the following: