4 papers · 1 filter
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…
Two-phase pair corona model for AGN: physical modelling and diagnostics
Juri Poutanen, Roland Svensson, Boris Stern
The predictions of the two-phase accretion disc-corona models for active galactic nuclei are compared with observations. We discuss the possibility to use X-ray spectral slopes, eq…
X-rays and gamma rays from active galactic nuclei
Roland Svensson
Various types of active galactic nuclei (AGN) are briefly discussed, with an emphasis on the theory of recent X-ray and -ray observations of the subclass, Seyfert 1 galaxies. Th…