ar X iv : a st ro - p h / 01 04 42 8 v 1 2 6 A pr 2 00 1 Echoes in X - ray binaries ; mapping the accretion flow

ar X iv : a st ro - p h / 01 04 11 3 v 1 6 A pr 2 00 1 1 / 2 Law for Non - Radiative Accretion Flow

At low densities, when radiation of an accreting gas is dynamically unimportant, quasi-spherical non-radiative accretion flow is formed around a compact object. We show that the density of the flow is n ∝ r −1/2. The gas compression is much weaker than the standard Bondi's, n ∝ r −3/2 , because most of the gas does not reach the compact object. It can either circulate indefinitely long or it ca...

ar X iv : a st ro - p h / 02 04 03 6 v 1 2 A pr 2 00 2 Investigating the Flame Microstructure in Type

ar X iv : a st ro - p h / 04 01 12 2 v 1 8 J an 2 00 4 High Energy Gamma - Ray

The physics results of high energy γ-ray astronomy are reported, emphasizing recent achievements with ground-based detectors. This includes some of the instrumental developments and latest projects. The fundamental contribution of the field to the question of Cosmic Ray origin is highlighted.

ar X iv : a st ro - p h / 01 03 43 8 v 1 2 7 M ar 2 00 1 X - rays and accretion discs as probes of the strong gravity of black holes

The observations and interpretation of broad iron lines in the X-ray spectra of Seyfert 1 galaxies are reviewed. The line profiles observed from MCG–6-30-15 and NGC 3516 show extended red wings to the line explained by large gravitational red-shifts. The results are consistent with the emission expected from an X-ray irradiated flat accretion disc orbiting very close to a black hole. Results fr...

ar X iv : a st ro - p h / 06 04 29 8 v 1 1 3 A pr 2 00 6 the Non - Gaussianity of Racetrack Inflation Models

In this paper, we use the result in [7] to calculate the non-Gaussianity of the racetrack models in [3, 5]. Our results show that the nonGaussianity in [3] is reasonable, while the non-Gaussianity in [5] is beyond the observational limits.