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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…
Unraveling the high-energy emission components of gamma-ray binaries
Víctor Zabalza, Valentí Bosch-Ramon, Felix Aharonian +1
The high and very-high energy spectrum of gamma-ray binaries has become a challenge for all theoretical explanations since the detection of powerful, persistent GeV emission from L…
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…
The ASTRO-H X-ray Observatory
Tadayuki Takahashi, Kazuhisa Mitsuda, Richard Kelley +220
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space and Astronautical Science (ISAS). ASTRO-H will…
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…
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…
Probing the central black hole in M87 with gamma-rays
Frank M. Rieger, Felix Aharonian
Recent high-sensitivity observation of the nearby radio galaxy M87 have provided important insights into the central engine that drives the large-scale outflows seen in radio, opti…
Constraints on the gamma-ray emission from the cluster-scale AGN outburst in the Hydra A galaxy cluster
HESS Collaboration, A. Abramowski, F. Acero +193
In some galaxy clusters powerful AGN have blown bubbles with cluster scale extent into the ambient medium. The main pressure support of these bubbles is not known to date, but cosm…
Cold ultrarelativistic pulsar winds as potential sources of galactic gamma-ray lines above 100 GeV
F. Aharonian, D. Khangulyan, D. Malyshev
The evidence of a line-like spectral feature at 130 GeV recently reported from some parts of the galactic plane poses serious challenges for any interpretation of this surprise dis…
Small pitch-angle magnetobremsstrahlung in inhomogeneous curved magnetic fields
Stanislav Kelner, Felix Aharonian
The character of radiation of relativistic charged particles in strong magnetic fields largely depends on the disposition of particle trajectories relative to the field lines. The…
Analytic Solution for Self-regulated Collective Escape of Cosmic Rays from their Acceleration Sites
M. A. Malkov, P. H. Diamond, R. Z. Sagdeev +2
Supernova remnants (SNRs), as the major contributors to the galactic cosmic rays (CR), are believed to maintain an average CR spectrum by diffusive shock acceleration (DSA) regardl…
TeV gamma rays from blazars beyond z=1?
Felix Aharonian, Warren Essey, Alexander Kusenko +1
At TeV energies, the gamma-ray horizon of the universe is limited to redshifts z<<1, and, therefore, any observation of TeV radiation from a source located beyond z=1 would call fo…
On the spectral shape of radiation due to Inverse Compton Scattering close to the maximum cut-off
E. Lefa, S. R. Kelner, F. A. Aharonian
The spectral shape of radiation due to Inverse Compton Scattering is analyzed, in the Thomson and the Klein-Nishina regime, for electron distributions with exponential cut-off. We…
Spectral analysis and interpretation of the γ-ray emission from the Starburst galaxy NGC 253
H. E. S. S. Collaboration, A. Abramowski, F. Acero +192
Very-high-energy (VHE; E >100 GeV) and high-energy (HE; 100 MeV < E < 100 GeV) data from γ-ray observations performed with the H.E.S.S. telescope array and the Fermi-LAT instrument…
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…
Discovery of VHE γ-ray emission and multi-wavelength observations of the BL Lac object 1RXS J101015.9-311909
HESS Collaboration, A. Abramowski, F. Acero +191
1RXS J101015.9-311909 is a galaxy located at a redshift of z=0.14 hosting an active nucleus belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV)…
Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589
HESS Collaboration, A. Abramowski, F. Acero +195
The observational coverage with HESS of the Carina region in VHE gamma-rays benefits from deep exposure (40 h) of the neighboring open cluster Westerlund 2. The observations have r…
Time structure of gamma-ray signals generated in line-of-sight interactions of cosmic rays from distant blazars
Anton Prosekin, Warren Essey, Alexander Kusenko +1
Blazars are expected to produce both gamma rays and cosmic rays. Therefore, observed high-energy gamma rays from distant blazars may contain a significant contribution from seconda…
Nuclear reactions in hot astrophysical plasmas with K
Ervin Kafexhiu, Felix Aharonian, Gabriela Vila
The importance of nuclear reactions in low-density astrophysical plasmas with ion temperatures K has been recognized for more than thirty years. However, the lack…
Magnetic substructure in the northern Fermi Bubble revealed by polarized WMAP emission
David I. Jones, Roland M. Crocker, Wolfgang Reich +2
We report a correspondence between giant, polarized microwave structures emerging north from the Galactic plane near the Galactic center and a number of GeV gamma-ray features, inc…
Interpretation of the flares of M87 at TeV energies in the cloud-jet interaction scenario
Maxim V. Barkov, Valenti Bosch-Ramon, Felix A. Aharonian
Active galactic nuclei with misaligned jets have been recently established as a class of high-energy gamma-ray sources. M87, a nearby representative of this class, shows fast TeV v…
Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
HESS Collaboration, A. Abramowski, F. Acero +195
The Fornax galaxy cluster was observed with the High Energy Stereoscopic System (H.E.S.S.) for a total live time of 14.5 hours, searching for very-high-energy (VHE, E>100 GeV) gamm…
A multiwavelength view of the flaring state of PKS 2155-304 in 2006
HESS Collaboration, A. Abramowski, F. Acero +208
Multiwavelength (MWL) observations of the blazar PKS 2155-304 during two weeks in July and August 2006, the period when two exceptional flares at very high energies (VHE, E>= 100 G…
Discovery of hard-spectrum γ-ray emission from the BL Lac object 1ES 0414+009
The HESS Collaboration, A. Abramowski, F. Acero +199
1ES 0414+009 (z = 0.287) is a distant high-frequency-peaked BL Lac object, and has long been considered a likely emitter of very-high energy (VHE, E>100 GeV) gamma-rays due to its…