555 citations · 2.2k across the 45 of their papers we have counts for
3 papers · 1 filter
Hard X-ray Variability of AGN
V. Beckmann, S. D. Barthelmy, T. J. -L. Courvoisier +4
Aims: Active Galactic Nuclei are known to be variable throughout the electromagnetic spectrum. An energy domain poorly studied in this respect is the hard X-ray range above 20 keV.…
Cygnus X-3 transition from the ultrasoft to the hard state
V. Beckmann, S. Soldi, G. Belanger +8
Aims: The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-…
2003--2005 INTEGRAL and XMM-Newton observations of 3C 273
M. Chernyakova, A. Neronov, T. J. -L. Courvoisier +9
The aim of this paper is to study the evolution of the broadband spectrum of one of the brightest and nearest quasars 3C 273. We analyze the data obtained during quasi-simultaneous…