As the sky in the microwave band is dominated by a cosmic background, so too is the X-ray
sky. In this report, the experimental approach used for measuring the X-ray background is …

The existence of ionized X-ray absorbing layers of gas along the line of sight to the nuclei of
Seyfert galaxies is a well established observational fact. This material is systematically …

The masses and emission-line region sizes of active galactic nuclei (AGNs) can be
measured by" reverberation-mapping" techniques, and we use these results to calibrate …

The formation of quasar black holes during the hydrodynamic collapse of protogalactic gas
clouds is discussed. The dissipational collapse and long-term dynamical evolution of these …

Effects of cold matter in active galactic nuclei - A broad hump in the X-ray spe ADS Classic is
now deprecated. It will be completely retired in October 2019. This page will automatically …

A model to explain the evolution of the quasar luminosity function is presented. At
intermediate and high redshifts, the formation of 'new'black holes at each step in the …

An empirical relationship, of particular interest for studies of high-redshift active galactic
nuclei (AGNs) and quasars, between the masses of their central black holes and rest-frame …

Using the results of a previous X-ray photoionization modelling of blueshifted Fe K
absorption lines on a sample of 42 local radio-quiet AGNs observed with XMM—Newton, in …

Kinematic evidence for a relativistic Keplerian disk - ARP 102B ADS Classic is now deprecated.
It will be completely retired in October 2019. This page will automatically redirect to the new …

We present analytical scaling laws for self-similar advection-dominated flows. The spectra
from these systems range from 10 8 to 10 20 Hz and are determined by considering cooling …