149 citations · 491 across the 13 of their papers we have counts for
13 papers
Background modelling for -ray spectroscopy with INTEGRAL/SPI
Thomas Siegert, Roland Diehl, Christoph Weinberger +3
The coded-mask spectrometer-telescope SPI on board the INTEGRAL observatory records photons in the energy range between 20 and 8000 keV. A robust and versatile method to model the…
Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni
Thomas Siegert, Roland Diehl, Jochen Greiner +7
Microquasars are stellar-mass black holes accreting matter from a companion star and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain s…
Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
Thomas Siegert, Roland Diehl, Gerasim Khachatryan +5
The annihilation of positrons in the Galaxy's interstellar medium produces characteristic gamma-rays with a line at 511 keV. This emission has been observed with the spectrometer S…
SN2014J gamma-rays from the 56Ni decay chain
Roland Diehl, Thomas Siegert, Wolfgang Hillebrandt +7
The measurement of gamma-ray lines from the decay chain of 56Ni provides unique information about the explosion in supernovae. The 56Ni freshly-produced in the supernova powers the…
GRO J1655-40: from ASCA and XMM-Newton Observations
Xiao-Ling Zhang, Shuang Nan Zhang, Gloria Sala +3
We have analysed four ASCA observations (1994--1995, 1996--1997) and three XMM-Newton observations (2005) of this source, in all of which the source is in high/soft state. We model…
Relativistic effects on the observed AGN luminosity distribution
Yuan Liu, Shuang Nan Zhang, Xiao Ling Zhang
Recently Zhang (2005) has proposed a model to account for the well established effect that the fraction of type-II AGNs is anti-correlated with the observed X-ray luminosity; the m…