10.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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- University of GenevaCH577 papers
28 papers · 2 filters
Multi-wavelength campaign on NGC7469 I. The rich 640 ks RGS spectrum
Ehud Behar, Uria Peretz, Gerard A. Kriss +15
Outflows in active galaxies (AGNs) are common, although their launching mechanism, location, and physical impact on the host galaxy remain controversial. We conducted a multiwavele…
Dark jets in the soft X-ray state of black hole binaries?
S. Drappeau, J. Malzac, M. Coriat +10
X-ray binary observations led to the interpretation that powerful compact jets, produced in the hard state, are quenched when the source transitions to its soft state. The aim of t…
Broadband X-ray spectral analysis of the Seyfert 1 galaxy GRS 1734-292
A. Tortosa, A. Marinucci, G. Matt +14
We discuss the broadband X-ray spectrum of GRS 1734-292 obtained from non-simultaneous XMM-Newton and NuSTAR observations, performed in 2009 and 2014, respectively. GRS1734-292 is…
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113
H. E. S. S. Collaboration, :, H. Abdalla +332
The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment's sensitivity to lower energies. The lowest energy threshold is obtained using monosc…
Non-thermal particle acceleration in collisionless relativistic electron-proton reconnection
G. R. Werner, D. A. Uzdensky, M. C. Begelman +2
Magnetic reconnection in relativistic collisionless plasmas can accelerate particles and power high-energy emission in various astrophysical systems. Whereas most previous studies…
First limits on the very-high energy gamma-ray afterglow emission of a fast radio burst: H.E.S.S. observations of FRB 150418
H. E. S. S. Collaboration, :, H. Abdalla +265
Aims: Following the detection of the fast radio burst FRB150418 by the SUPERB project at the Parkes radio telescope, we aim to search for very-high energy gamma-ray afterglow emiss…
Electrodynamics of pulsar magnetospheres
Benoît Cerutti, Andrei Beloborodov
We review electrodynamics of rotating magnetized neutron stars, from the early vacuum model to recent numerical experiments with plasma-filled magnetospheres. Significant progress…
Deeper H.E.S.S. observations of Vela Junior (RX J0852.04622): Morphology studies and resolved spectroscopy
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +260
Aims. We study gamma-ray emission from the shell-type supernova remnant (SNR) RX J0852.04622 to better characterize its spectral properties and its distribution over the SNR. Me…
Observations of Binary Systems with the H.E.S.S. Telescopes
P. Bordas, G. Dubus, P. Eger +8
Observations of binary systems obtained recently with the High Energy Stereoscopic System (H.E.S.S) of Cherenkov telescopes are reported. The outcomes of a detailed observation cam…
Characterizing the gamma-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +244
Studying the temporal variability of BL Lac objects at the highest energies provides unique insights into the extreme physical processes occurring in relativistic jets and in the v…
H.E.S.S. limits on line-like dark matter signatures in the 100 GeV to 2 TeV energy range close to the Galactic Centre
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +246
A search for dark matter line-like signals was performed in the vicinity of the Galactic Centre by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likeliho…
Polarized synchrotron emission from the equatorial current sheet in gamma-ray pulsars
Benoît Cerutti, Jérémy Mortier, Alexander A. Philippov
Polarization is a powerful diagnostic tool to constrain the site of the high-energy pulsed emission and particle acceleration in gamma-ray pulsars. Recent particle-in-cell simulati…
The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +253
The supernova remnant (SNR) W49B originated from a core-collapse supernova that occurred between one and four thousand years ago, and subsequently evolved into a mixed-morphology r…
H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution; evidence for gamma-ray emission extending beyond the X-ray emitting shell
H. E. S. S. Collaboration, :, H. Abdalla +252
Supernova remnants exhibit shock fronts (shells) that can accelerate charged particles up to very high energies. In the past decade, measurements of a handful of shell-type superno…
A Luminous Gamma-ray Binary in the Large Magellanic Cloud
R. H. D. Corbet, L. Chomiuk, M. J. Coe +9
Gamma-ray binaries consist of a neutron star or a black hole interacting with a normal star to produce gamma-ray emission that dominates the radiative output of the system. Only a…
High-energy monitoring of NGC 4593 with XMM-Newton and NuSTAR. X-ray spectral analysis
F. Ursini, P. -O. Petrucci, G. Matt +8
We present results from a joint Xmm-Newton/NuSTAR monitoring of the Seyfert 1 NGC 4593, consisting of 5x20 ks simultaneous observations spaced by two days, performed in January 201…
Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdallah +245
The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a searc…
High-energy gamma-ray observations of the accreting black hole V404 Cygni during its June 2015 outburst
A. Loh, S. Corbel, G. Dubus +7
We report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray binary V404 Cygni during its outburst in June-July 2015. Detailed analyses reveal a…
A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +244
Microquasars are potential -ray emitters. Indications of transient episodes of -ray emission were recently reported in at least two systems: Cyg X-1 and Cyg X-3. The identifi…
Magnetorotational dynamo chimeras. The missing link to turbulent accretion disk dynamo models?
A. Riols, F. Rincon, C. Cossu +3
In Keplerian accretion disks, turbulence and magnetic fields may be jointly excited through a subcritical dynamo process involving the magnetorotational instability (MRI). High-res…
Extended VHE gamma-ray emission towards SGR1806-20, LBV1806-20, and stellar cluster Cl*1806-20
H. Abdalla, A. Abramowski, F. Aharonian +241
Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we have discovered a steady and extended very high-energy (VHE) gamma-ray source towards the luminous blue variable…
X-ray polarimetric signatures induced by spectral variability in the framework of the receding torus model
F. Marin, R. W. Goosmann, P. -O. Petrucci
Obscuring circumnuclear dust is a well-established constituent of active galactic nuclei (AGN). Traditionally referred to as the receding dusty torus, its inner radius and angular…
Anatomy of the AGN in NGC 5548 VIII. XMM-Newton's EPIC detailed view of an unexpected variable multilayer absorber
M. Cappi, B. De Marco, G. Ponti +21
In 2013 we conducted a large multi-wavelength campaign on the archetypical Seyfert 1 galaxy NGC 5548. Unexpectedly, this usually unobscured source appeared strongly absorbed in the…
The microphysics of collisionless shock waves
A. Marcowith, A. Bret, A. Bykov +12
Collisionless shocks, that is shocks mediated by electromagnetic processes, are customary in space physics and in astrophysics. They are to be found in a great variety of objects a…