ar X iv : a st ro - p h / 01 03 25 5 v 2 1 9 M ar 2 00 1 Construction and Preliminary Application of the Variability → Luminosity Estimator

ar X iv : a st ro - p h / 01 03 25 5 v 1 1 6 M ar 2 00 1 Construction and Preliminary Application of the Variability →

We present a possible Cepheid-like luminosity estimator for the longduration gamma-ray bursts based on the variability of their light curves. We also present a preliminary application of this luminosity estimator to 907 long-duration bursts from the BATSE catalog.

ar X iv : a st ro - p h / 01 03 25 4 v 1 1 6 M ar 2 00 1 Construction of the Variability → Luminosity Estimator

ar X iv : a st ro - p h / 01 03 44 4 v 1 2 7 M ar 2 00 1 From Centimeter to Millimeter Wavelengths : A High Angular Resolution Study of 3 C 273

We monitored 3C 273 with VLBI at 15–86 GHz since 1990. We discuss component trajectories, opacity effects, a rotating jet, and outburst-ejection relations from Gamma-ray to radio bands.

ar X iv : a st ro - p h / 01 03 15 7 v 1 1 1 M ar 2 00 1 Population of X - ray binaries and the dynamical history of their host galaxies

The observed luminosity distributions of X-ray sources suggest the presence of several populations of X-ray binaries in the nearby galaxies. Each population probably has a different formation and evolutionary history, depending on the intrinsic properties of the sources and the host environment. The features seen in the Log N (> S) – Log S plots for different galactic components and for differe...

ar X iv : a st ro - p h / 01 03 13 9 v 1 9 M ar 2 00 1 Diffusion of the scalar field energy due to the backscattering off Schwarzschild geometry

This note tackles the problem of the backscattering of a mass-less scalar field in the case of Schwarzschildean space-time. It shows that the effect depends both on a distance from the horizon and on the wave length. The obtained estimates significantly improve former results.