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19 papers · 2 filters
GRB emission in Neutron Star transitions
M. Angeles Perez-Garcia, Frederic Daigne, Joseph Silk
In this contribution we briefly introduce a mechanism for short gamma ray burst emission different from the usually assumed compact object binary merger progenitor model. It is bas…
Polarization transfer in relativistic magnetized plasmas
Jean Heyvaerts, Christophe Pichon, Simon Prunet +1
The polarization transfer coefficients of a relativistic magnetized plasma are derived. These results apply to any momentum distribution function of the particles, isotropic or ani…
Evidence for a Photospheric Component in the Prompt Emission of the Short GRB120323A and its Effects on the GRB Hardness-Luminosity Relation
S. Guiriec, F. Daigne, R. Hascoët +12
The short GRB 120323A had the highest flux ever detected with the Fermi/GBM. Here we study its remarkable spectral properties and their evolution using two spectral models: (i) a s…
The evolution of active galactic nuclei and their spins
Marta Volonteri, Marek Sikora, Jean-Pierre Lasota +1
Massive black holes (MBHs) in contrast to stellar mass black holes are expected to substantially change their properties over their lifetime. MBH masses increase by several order o…
Acceleration and propagation of ultrahigh energy cosmic rays
M. Lemoine
The origin of the highest energy cosmic rays represents one of the most conspicuous enigmas of modern astrophysics, in spite of gigantic experimental efforts in the past fifty year…
Simulating SZ intensity maps of giant AGN cocoons
D. A. Prokhorov, A. Moraghan, V. Antonuccio-Delogu +1
We perform relativistic hydrodynamic simulations of the formation and evolution of AGN cocoons produced by very light powerful jets. We calculate the intensity maps of the Sunyaev-…
Comprehensive multi-wavelength modelling of the afterglow of GRB050525A
L. Resmi, K. Misra, G. Jóhannesson +13
The Swift era has posed a challenge to the standard blast-wave model of Gamma Ray Burst (GRB) afterglows. The key observational features expected within the model are rarely observ…
Study of the Gamma-ray Spectrum from the Galactic Center in view of Multi-TeV Dark Matter Candidates
Alexander V. Belikov, Gabrijela Zaharijas, Joseph Silk
Motivated by the complex gamma-ray spectrum of the Galactic Center source now measured over five decades in energy, we revisit the issue of the role of dark matter annihilations in…
Quasi-star jets as unidentified gamma-ray sources
Bozena Czerny, Agnieszka Janiuk, Marek Sikora +1
Gamma-ray catalogs contain a considerable amount of unidentified sources. Many of these are located out of the Galactic plane and therefore may have extragalactic origin. Here we a…
Accounting for the XRT early steep decay in models of the prompt GRB emission
R. Hascoët, F. Daigne, R. Mochkovitch
The Swift-XRT observations of the early X-ray afterglow of GRBs show that it usually begins with a steep decay phase. A possible origin of this early steep decay is the high latitu…
Afterglows after Swift
O. Godet, R. Mochkovitch
Since their discovery by the Beppo-SAX satellite in 1997, gamma-ray burst afterglows have attracted an ever-growing interest. They have allowed redshift measurements that have conf…
Particle transport and heating in the microturbulent precursor of relativistic shocks
Illya Plotnikov, Guy Pelletier, Martin Lemoine
Collisionless relativistic shocks have been the focus of intense theoretical and numerical investigations in recent years. The acceleration of particles, the generation of electrom…
Synchrotron signature of a relativistic blast wave with decaying microturbulence
M. Lemoine
Microphysics of weakly magnetized relativistic collisionless shock waves, corroborated by recent high performance numerical simulations, indicate the presence of a microturbulent l…
Particle acceleration in relativistic outflows
Andrei Bykov, Neil Gehrels, Henric Krawczynski +3
In this review we confront the current theoretical understanding of particle acceleration at relativistic outflows with recent observational results on various source classes thoug…
H.E.S.S. observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae
HESS Collaboration, A. Abramowski, F. Acero +191
The massive binary system Eta Carinae and the surrounding HII complex, the Carina Nebula, are potential particle acceleration sites from which very-high-energy (VHE; E > 100 GeV) γ…
Investigating slim disk solutions for HLX-1 in ESO 243-49
O. Godet, B. Plazolles, T. Kawaguchi +7
The hyper luminous X-ray source HLX-1 in the galaxy ESO 243-49, currently the best intermediate mass black hole candidate, displays spectral transitions similar to those observed i…
The origin of the late rebrightening in GRB 080503
R. Hascoët, F. Daigne, R. Mochkovitch
GRB 080503, detected by Swift, belongs to the class of bursts whose prompt phase consists of an initial short spike followed by a longer soft tail. It did not show any transition t…
Effects Of Circum-nuclear Disk Gas Evolution And The Spin Of Central Black Holes
Umberto Maio, Massimo Dotti, Margarita Petkova +2
Mass and spin are the only two parameters needed to completely characterize black holes in General Relativity. However, the interaction between black holes and their environment is…
CLUMPY: a code for gamma-ray signals from dark matter structures
A. Charbonnier, C. Combet, D. Maurin
We present the first public code for semi-analytical calculation of the gamma-ray flux astrophysical J-factor from dark matter annihilation/decay in the Galaxy, including dark matt…