924 citations · 39.2k across the 592 of their papers we have counts for
31 papers · 1 filter
Simultaneous H.E.S.S. and Chandra observations of Sagittarius A* during an X-ray flare
H. E. S. S. Collaboration, :, F. Aharonian
The rapidly varying (~10 minute timescale) non-thermal X-ray emission observed from Sgr A* implies that particle acceleration is occuring close to the event horizon of the supermas…
Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S
H. E. S. S. Collaboration, :, F. Aharonian
Aims: The nearby galaxy clusters Abell 496 and Abell 85 are studied in the very high energy (VHE, E > 100 GeV) band to investigate VHE cosmic rays (CRs) in this class of objects wh…
Study of the Spectral and Temporal Characteristics of X-Ray Emission of the Gamma-Ray Binary LS 5039 with Suzaku
T. Takahashi, T. Kishishita, Y. Uchiyama +6
We report on the results from Suzaku broadband X-ray observations of the galactic binary source LS5039. The Suzaku data, which have continuous coverage of more than one orbital per…
Clues to unveil the emitter in LS 5039: powerful jets vs colliding winds
V. Bosch-Ramon, D. Khangulyan, F. A. Aharonian
LS 5039 is among the most interesting VHE sources in the Galaxy. Two scenarios have been put forward to explain the observed TeV radiation: jets vs pulsar winds. The source has bee…
The energy spectrum of cosmic-ray electrons at TeV energies
H. E. S. S. Collaboration, :, F. Aharonian
The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon/satellite based instruments in the detection of very-high-energy…
The Spectral Shape and Photon Fraction as Signatures of the GZK-Cutoff
Andrew M. Taylor, Felix A. Aharonian
With the prospect of measuring the fraction of arriving secondary photons, produced through photo-pion energy loss interactions of ultra high energy cosmic ray (UHECR) protons with…
The TeV emitter structure in LS 5039
Valenti Bosch-Ramon, Dmitry Khangulyan, Felix Aharonian
LS 5039 is an X-ray binary detected at very high energies. Along the orbit, there is a significant detection even during the superior conjunction of the compact object, when very l…
Probing the Galactic cosmic ray flux with submillimeter and gamma ray data
S. Casanova, S. Gabici, F. A. Aharonian +5
The study of Galactic diffuse radiation combined with the knowledge of the distribution of the molecular hydrogen in the Galaxy offers a unique tool to probe the cosmic ray flu…
Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304
H. E. S. S. Collaboration, :, F. Aharonian
In the past few decades, several models have predicted an energy-dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxie…
Discovery of gamma-ray emission from the shell-type supernova remnant RCW 86 with H.E.S.S
HESS Collaboration, F. Aharonian
The shell-type supernova remnant (SNR) RCW 86, possibly associated with the historical supernova SN 185, with its relatively large size (about 40' in diameter) and the presence of…
Non-thermal radiation from molecular clouds illuminated by cosmic rays from nearby supernova remnants
Stefano Gabici, Sabrina Casanova, Felix A. Aharonian
Molecular clouds are expected to emit non-thermal radiation due to cosmic ray interactions in the dense magnetized gas. Such emission is amplified if a cloud is located close to an…
Hydrodynamics of interaction of pulsar and stellar winds and its impact on the high energy radiation of binary pulsar systems
D. V. Khangulyan, F. A. Aharonian, S. V. Bogovalov +2
The hydrodynamics of the interaction of pulsar and stellar winds in binary systems harboring a pulsar and its impact on the nonthermal radiation of the binary pulsar PSR B1259-63/S…
A search for a dark matter annihilation signal towards the Canis Major overdensity with H.E.S.S
HESS Collaboration, F. Aharonian
A search for a dark matter (DM) annihilation signal into -rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial a…
H.E.S.S. Observations of the Prompt and Afterglow Phases of GRB 060602B
HESS Collaboration, F. Aharonian
We report on the first completely simultaneous observation of a gamma-ray burst (GRB) using an array of Imaging Atmospheric Cherenkov Telescopes which is sensitive to photons in th…
HESS J0632+057 : A new gamma-ray binary?
J. A. Hinton, J. L. Skilton, S. Funk +8
The High Energy Stereoscopic System (HESS) survey of the Galactic plane has established the existence of a substantial number (~40) of Galactic TeV gamma-ray sources, a large fract…
The magnetic field and the location of the TeV emitter in Cygnus X-1 and LS 5039
V. Bosch-Ramon, D. Khangulyan, F. A. Aharonian
Cygnus X-1 and LS 5039 are two X-ray binaries observed at TeV energies. Both sources are compact systems, contain jet-like (radio) structures, and harbor very luminous O stars. A T…
H.E.S.S. upper limits for Kepler's supernova remnant
HESS Collaboration, F. Aharonian
Observations of Kepler's supernova remnant (G4.5+6.8) with the H.E.S.S. telescope array in 2004 and 2005 with a total live time of 13 h are presented. Stereoscopic imaging of Chere…
The diffuse neutrino flux from the inner Galaxy: constraints from very high energy gamma-ray observations
S. Gabici, A. M. Taylor, R. J. White +2
Recently, the MILAGRO collaboration reported on the detection of a diffuse multi-TeV emission from a region of the Galactic disk close to the inner Galaxy. The emission is in exces…
Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku
Takaaki Tanaka, Yasunobu Uchiyama, Felix A. Aharonian +11
We present results obtained from a series of observations of the supernova remnant RX J1713.7-3946 by the Suzaku satellite. The observations cover about two-thirds of the remnant s…
Particle acceleration close to the supermassive black hole horizon: the case of M87
F. M. Rieger, F. A. Aharonian
The radio galaxy M87 has recently been found to be a rapidly variable TeV emitting source. We analyze the implications of the observed TeV characteristics and show that it proves c…
On the X-ray/TeV connection in Galactic jet sources
V. Bosch-Ramon, D. Khangulyan, F. A. Aharonian
There are three Galactic jet sources, from which TeV emission has been detected: LS 5039, LS I +61 303 and Cygnus X-1. These three sources show power-law tails at X-rays and soft g…
Fast Variability of Nonthermal X-Ray Emission in Cassiopeia A: Probing Electron Acceleration in Reverse-Shocked Ejecta
Yasunobu Uchiyama, Felix Aharonian
Recent discovery of the year-scale variability in the synchrotron X-ray emission of the supernova remnant (SNR) RX J1713.7-3946 has initiated our study of multi-epoch X-ray images…
Diffusive shock acceleration in radiation dominated environments
G. Vannoni, S. Gabici, F. A. Aharonian
Radio, X-ray, and gamma-ray observations provide us with strong evidence of particle acceleration to multi-TeV energies in various astrophysical sources. Diffusive shock accelerati…
Discovery of a VHE gamma-ray source coincident with the supernova remnant CTB 37A
HESS Collaboration, F Aharonian
The supernova remnant (SNR) complex CTB 37 is an interesting candidate for observations with Very High Energy (VHE) gamma-ray telescopes such as H.E.S.S. In this region, three SNRs…