output
19922026
Showing 2009 · astro-ph.HEShow all

13 papers · 2 filters

astro-ph.HE2009

Extending the search for neutrino point sources with IceCube above the horizon

The IceCube Collaboration, R. Abbasi

Point source searches with the IceCube neutrino telescope have been restricted to one hemisphere, due to the exclusive selection of upward going events as a way of rejecting the at…

astro-ph.HE2009★ 12 cited

Neutrino emission from high-energy component gamma-ray bursts

J. K. Becker, F. Halzen, A. O'Murchadha +1

Gamma-ray bursts have the potential to produce the particle energies (up to eV) and the energy budget () to accommodate the spectrum of…

astro-ph.HE2009★ 219 cited

Detection of Gamma Rays From a Starburst Galaxy

The HESS Collaboration, F. Acero

Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of ~…

astro-ph.HE2009★ 1 cited

The starburst-GRB connection

Jens Dreyer, Julia K. Becker, Wolfgang Rhode

As starburst galaxies show a star formation rate up to several hundred times larger than the one in a typical galaxy, the expected supernova rate is higher than average. This in tu…

astro-ph.HE2009★ 68 cited

Klein-Nishina steps in the energy spectrum of galactic cosmic ray electrons

R. Schlickeiser, J. Ruppel

The full Klein-Nishina cross section for the inverse Compton scattering interactions of electrons implies a significant reduction of the electron energy loss rate compared to the T…

astro-ph.HE2009★ 243 cited

Radio Imaging of the Very-High-Energy Gamma-Ray Emission Region in the Central Engine of a Radio Galaxy

The VERITAS Collaboration, the VLBA 43 GHz M 87 Monitoring Team, the H. E. S. S. Collaboration +1

The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particle…

astro-ph.HE2009★ 6 cited

Neutrinos from photo-hadronic interactions in Pks2155-304

Julia K. Becker, Athina Meli, Peter L. Biermann

The high-peaked BL Lac object Pks2155-304 shows high variability at multiwavelengths, i.e. from optical up to TeV energies. A giant flare of around 1 hour at X-ray and TeV energies…

astro-ph.HE2009★ 505 cited

Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S

H. E. S. S. Collaboration, :, F. Aharonian

The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by the ATIC experiment has - together with the PAMELA detection of a rise in the positron f…

astro-ph.HE2009★ 68 cited

Detection of Very High Energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+06

F. Aharonian

Detection of a gamma-ray source above 300 GeV is reported, confirming the unidentified source MGRO J1908+06, discovered by the Milagro collaboration at a median energy of 20 TeV. T…

astro-ph.HE2009★ 28 cited

H.E.S.S. upper limit on the very high energy gamma-ray emission from the globular cluster 47 Tucanae

HESS collaboration, F. Aharonian

Observations of the globular cluster 47 Tucanae (NGC 104), which contains at least 23 millisecond pulsars, were performed with the H.E.S.S. telescope system. The observations lead…

astro-ph.HE2009★ 173 cited

Simultaneous observations of PKS 2155-304 with H.E.S.S., Fermi, RXTE and ATOM: spectral energy distributions and variability in a low state

H. E. S. S., Fermi-LAT collaborations

We report on the first simultaneous observations that cover the optical, X-ray, and high energy gamma-ray bands of the BL Lac object PKS 2155-304. The gamma-ray bands were observed…

astro-ph.HE2009★ 59 cited

H.E.S.S. observations of gamma-ray bursts in 2003-2007

F. Aharonian

Very-high-energy (VHE; >~100 GeV) gamma-rays are expected from gamma-ray bursts (GRBs) in some scenarios. Exploring this photon energy regime is necessary for understanding the ene…

astro-ph.HE2009

Cosmic-ray driven dynamo in the medium of irregular galaxy

Hubert Siejkowski, Marian Soida, Katarzyna Otmianowska-Mazur +2

We investigate the cosmic ray driven dynamo in the interstellar medium of irregular galaxy. The observations (Chyzy et al. 2000, 2003) show that the magnetic field in irregular gal…