ar X iv : a st ro - p h / 99 01 24 6 v 1 1 9 Ja n 19 99 Bars and boxy / peanut -

ar X iv : a st ro - p h / 99 01 10 8 v 1 1 0 Ja n 19 99 Accretion Disk Models

Models of black hole accretion disks are reviewed, with an emphasis on the theory of hard X-ray production. The following models are considered: i) standard, ii) super-critical, iii) two-temperature, and iv) disk+corona. New developments have recently been made in hydrodynamical models of accretion and in phenomenological radiative models fitting the observed X-ray spectra. Attempts to unify th...

ar X iv : a st ro - p h / 99 01 14 4 v 1 1 2 Ja n 19 99 BeppoSAX observations of bright Seyfert 2 galaxies

We report on BeppoSAX broad band (0.1-100 keV) observations of bright Seyfert 2 galaxies and discuss the results in the framework of the unified theory of AGNs. The data are used to probe N H distribution in type 2 objects and to identify heavily absorbed (10 24 ≤ N H ≤ 10 25 cm −2) sources, which are particularly bright in hard X-rays. They also provide, for the first time, high energy spectra...

ar X iv : a st ro - p h / 97 01 22 8 v 1 2 9 Ja n 19 97 Large - scale Structures revealed by Wavelet Decomposition 1

ar X iv : a st ro - p h / 96 01 12 9 v 1 2 3 Ja n 19 96 Is Her X - 1 a strange star

The possible identification of Her X-1 with a strange star (Li et al. 1995) is shown to be incorrect.

ar X iv : a st ro - p h / 99 01 01 2 v 1 4 J an 1 99 9 Position of First Doppler Peak

In this talk, I describe a calculation of the geodesics since last scattering and derive the dependence of the position of the first Doppler Peak on Ωm and ΩΛ.