9 papers · 1 filter
Statistical Constraints On Non-Cosmological Subclasses Of GRBs
Ya. Tikhomirova, B. E. Stern, R. Svensson
There still exists the possibility that the phenomenon of gamma-ray bursts (GRBs) is a mixture of events of different nature, even within the class of long (>2 s) bursts. We try to…
Power Density Spectra of Gamma-Ray Bursts
Andrei M. Beloborodov
Power density spectra (PDSs) of long gamma-ray bursts provide useful information on GRBs, indicating their self-similar temporal structure. The best power-law PDSs are displayed by…
Old and New Advances in Black Hole Accretion Disk Theory
Roland Svensson
A summary is given of the high-lights during the Reykjavik Midsummer Symposium on Non-Linear Phenomena in Accretion Discs around Black Holes. Such high-lights include the recent ad…
Thermalization Mechanisms in Compact Sources
Roland Svensson
There is strong observational evidence that a quasi-thermal population of electrons (or pairs) exists in compact X-ray sources. It is, however, unclear what mechanism thermalizes t…
The variable X/gamma-ray spectrum of the Seyfert 2 galaxy NGC 7172
Felix Ryde, Juri Poutanen, Roland Svensson +2
A broad band X-, gamma-ray spectral study of the Seyfert 2 galaxy NGC 7172 is presented. We use our ASCA observations from May 1995 and combine these with the CGRO OSSE data from M…
Average properties of the time behaviour of gamma-ray bursts
Boris Stern, Roland Svensson, Juri Poutanen
The average peak-aligned profile of all bursts detected by BATSE with sufficient data quality has a simple ``stretched'' exponential shape, F ~ exp[-(t/t_0)^{1/3}], where is th…