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19912026
Showing 2012 · astro-ph.HEShow all

52 papers · 2 filters

astro-ph.HE2012★ 7 cited

Fermi-LAT measurement of the diffuse gamma-ray emission and constraints on the Galactic Dark Matter signal

Gabrijela Zaharijas, Jan Conrad, Alessandro Cuoco +1

We study diffuse gamma-ray emission at intermediate Galactic latitudes measured by the Fermi Large Area Telescope with the aim of searching for a signal from dark matter annihilati…

astro-ph.HE2012★ 115 cited

X-ray follow-ups of XSSJ12270-4859: a low-mass X-ray binary with gamma ray FERMI-LAT association

D. de Martino, T. Belloni, M. Falanga +10

XSSJ1227.0-4859 is a peculiar, hard X-ray source recently positionally associated to the Fermi-LAT source 1FGLJ1227.9-4852/2FGLJ1227.7-4853. Multi-wavelength observations have adde…

astro-ph.HE2012★ 2 cited

Colliding wind binaries and gamma-ray binaries : relativistic version of the RAMSES code

Astrid Lamberts, Guillaume Dubus, Sebastien Fromang +1

Gamma-ray binaries are colliding wind binaries (CWB) composed of a massive star a non-accreting pulsar with a highly relativistic wind. Particle acceleration at the shocks results…

astro-ph.HE2012★ 200 cited

Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S

H. E. S. S. Collaboration, :, A. Abramowski +195

The extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this stud…

astro-ph.HE2012★ 99 cited

Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow

LAT Collaboration, GBM Collaboration, Swift Collaboration +2

We report on the multiwavelength observations of the bright, long gamma-ray burst \GRB, by the \Fermi and \Swift observatories, and by the MOA and GROND optical telescopes. The ana…

astro-ph.HE2012★ 72 cited

Distribution of High-Mass X-ray Binaries in the Milky Way

Alexis Coleiro, Sylvain Chaty

Observations of the high energy sky, particularly with the INTEGRAL satellite, have quadrupled the number of supergiant X-ray Binaries observed in the Galaxy, and revealed new popu…

astro-ph.HE2012★ 115 cited

Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations

H. J. Pletsch, L. Guillemot, H. Fehrmann +150

Millisecond pulsars, old neutron stars spun-up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "…

astro-ph.HE2012★ 6 cited

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…

astro-ph.HE2012★ 40 cited

Identification of HESS J1303-631 as a Pulsar Wind Nebula through gamma-ray, X-ray and radio observations

The H. E. S. S. Collaboration, :, A. Abramowski +196

The previously unidentified very high-energy (VHE; E > 100 GeV) γ-ray source HESS J1303-631, discovered in 2004, is re-examined including new data from the H.E.S.S. Cherenkov teles…

astro-ph.HE2012★ 13 cited

Disentangling the NIR/optical emission of the black hole XTE J1650-500 during outburst

P. A. Curran, S. Chaty, J. A. Zurita Heras

While the sources of X-ray and radio emission in the different states of low-mass X-ray binaries are relatively well understood, the origin of the near-infrared (NIR) and optical e…

astro-ph.HE2012★ 76 cited

Nonthermal X-rays from low-energy cosmic rays: Application to the 6.4 keV line emission from the Arches cluster region

Vincent Tatischeff, Anne Decourchelle, Gilles Maurin

The iron line at 6.4 keV provides a valuable spectral diagnostic in several fields of X-ray astronomy. It often results from the reprocessing of external X-rays by a neutral or low…

astro-ph.HE2012★ 7 cited

Giant H II Regions in M101. I. X-ray Analysis of Hot Gas

Wei Sun, Yang Chen, Li Feng +4

We performed a Chandra X-ray study of three giant H II regions (GHRs), NGC 5461, NGC 5462, and NGC 5471, in the spiral galaxy M101. The X-ray spectra of the three GHRs all contain…

astro-ph.HE2012★ 93 cited

Probing the extent of the non-thermal emission from the Vela X region at TeV energies with H.E.S.S

A. Abramowski, F. Acero, F. Aharonian +196

Vela X is a region of extended radio emission in the western part of the Vela constellation: one of the nearest pulsar wind nebulae (PWNe), and associated with the energetic Vela p…

astro-ph.HE2012★ 37 cited

The northwestern ejecta knot in SN 1006

Sjors Broersen, Jacco Vink, Marco Miceli +3

Aims: We want to probe the physics of fast collision-less shocks in supernova remnants. In particular, we are interested in the non-equilibration of temperatures and particle accel…

astro-ph.HE2012★ 26 cited

3D Simulations of the Thermal X-ray Emission from Young Supernova Remnants Including Efficient Particle Acceleration

Gilles Ferrand, Anne Decourchelle, Samar Safi-Harb

Supernova remnants (SNRs) are believed to be the major contributors to Galactic cosmic rays. The detection of non-thermal emission from SNRs demonstrates the presence of energetic…

astro-ph.HE2012★ 16 cited

A two-component model for the high-energy variability of blazars. Application to PKS 2155-304

Matías M. Reynoso, Gustavo E. Romero, María C. Medina

We study the production of VHE emission in blazars as a superposition of a steady component from a baryonic jet and a time- dependent contribution from an inner e-e+ beam launched…

astro-ph.HE2012★ 28 cited

Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N157B with the High Energy Stereoscopic System

HESS Collaboration, A. Abramowski, F. Acero +195

We present the significant detection of the first extragalactic pulsar wind nebula (PWN) detected in gamma rays, N157B, located in the large Magellanic Cloud (LMC). Pulsars with hi…

astro-ph.HE2012★ 30 cited

XMM-Newton evidence of shocked ISM in SN 1006: indications of hadronic acceleration

M. Miceli, F. Bocchino, A. Decourchelle +5

Shock fronts in young supernova remnants are the best candidates for being sites of cosmic ray acceleration up to a few PeV, though conclusive experimental evidence is still lackin…

astro-ph.HE2012★ 33 cited

Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17498-2921

M. Falanga, L. Kuiper, J. Poutanen +5

We analyze the spectral and timing properties of IGR J17498-2921 and the characteristics of X-ray bursts to constrain the physical processes responsible for the X-ray production in…

astro-ph.HE2012★ 29 cited

Detection Potential of the KM3NeT Detector for High-Energy Neutrinos from the Fermi Bubbles

The KM3NeT Collaboration

A recent analysis of the Fermi Large Area Telescope data provided evidence for a high-intensity emission of high-energy gamma rays with a E^-2 spectrum from two large areas, spanni…

astro-ph.HE2012★ 11 cited

X-ray and Near Infrared observations of the obscured accreting pulsar IGR J18179-1621

M. A. Nowak, A. Paizis, J. Rodriguez +6

IGR J18179-1621 is an obscured accreting X-ray pulsar discovered by INTEGRAL on 2012 February 29. We report on our 20 ksec Chandra-High Energy Transmission Gratings Spectrometer ob…

astro-ph.HE2012★ 201 cited

GRB110721A: An extreme peak energy and signatures of the photosphere

The Fermi LAT Collaboration, the GBM Collaboration, A. Pe'er

GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The burst consisted o…

astro-ph.HE2012★ 32 cited

Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347

Aya Bamba, Gerd Puehlhofer, Fabio Acero +7

A detailed analysis of the nonthermal X-ray emission from the North-Western and Southern parts of the supernova remnant (SNR) HESS J1731347 with {\it Suzaku} is presented. The…

astro-ph.HE2012★ 65 cited

Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state

M. Ackermann, M. Ajello, J. Ballet +208

The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuou…