2001/06/13 by S. Komossa, Komossa, Stefanie
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
paper · pdf · doi:10.48550/arxiv.astro-ph/0106232
openalex publication_date 2001/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
MR 2251-178 was the first quasar initially discovered in X-rays, and the first one found to host a warm absorber. Despite its many outstanding multi-wavelength properties, MR 2251-178 has not yet been studied in detail with recent X-ray observatories. Here, we present results from an analysis of the X-ray spectral, temporal, and spatial properties of this source and its environment based on deep observations carried out with the X-ray satellite \sl ROSAT. The derived mean soft X-ray luminosity of MR 2251-178, ~1045 erg/s, places the quasar among the most X-ray luminous AGN in the local universe. The complete results of this study appeared in A&A 367, 801 (see http://www.xray.mpe.mpg.de/~skomossa/).