A. C. Fabian

TL;DR: In this paper, the contribution of radio-loud active galactic nuclei to the γ-ray background using the recent detections by GRO of BL Lacs and flat-spectrum radio quasars at energies > 100 MeV was estimated.

TL;DR: In this paper, the first detection of a sharp spectral feature in a narrow-line Seyfert 1 galaxy was reported, which suggests a connection with the neutral iron K photoelectric edge, but the lack of any obvious absorption in the spectrum at lower energies makes the interpretation challenging.

TL;DR: In this paper, the authors studied the properties of the innermost ICM in the cores of 101 X-ray galaxy groups and clusters, which is volume-limited in each of three Xray luminosity bins, and determined the effect of non-gravitational processes, such as active galactic nucleus (AGN) feedback, on the ICM.

TL;DR: In this paper, the authors present spectral analysis of ASCA data of 17 elliptical and 3 lenticular galaxies most of which have high L_x/L_B. The abundances derived from the cooling-flow model are also significantly larger, = 0.6 +/- 0.5 Z_sun.

TL;DR: The XMM-Newton Medium Sensitivity Survey (XMS) as mentioned in this paper provides an unbiased and quantitative description of the X-ray source population at these fluxes and in various Xray energy bands.