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The Great Annihilator 1E1740.7-2942: Molecular cloud connection and coronal structure
O. Vilhu, D. Hannikainen, P. Muhli +4
Using 12CO and 13CO observations we present column density maps of the molecular cloud (V = -135 km/s) in the direction of 1E1740.7-2942. Hydrogen column densities of the cloud sca…
X-rays and gamma-rays from accretion flows onto black holes in Seyferts and X-ray binaries
Andrzej A. Zdziarski, W. Neil Johnson, Juri Poutanen +2
We review observations and theoretical models of X-ray/gamma-ray spectra of radio-quiet Seyfert galaxies and of Galactic black-hole candidates (in the hard spectral state). The obs…
A simple formula for the thermal pair annihilation line emissivity
Roland Svensson, Stefan Larsson, Juri Poutanen
We introduce a simple and convenient fitting formula for the thermal annihilation line from pair plasmas in cosmic sources. The fitting formula is accurate to 0.04\% and is valid a…