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19922026
Showing astro-phShow all

290 papers · 1 filter

astro-ph2008★ 33 cited

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…

astro-ph2008★ 1 cited

The magnetic field structure in NGC 253 in presence of a galactic wind

V. Heesen, M. Krause, R. Beck +1

We present radio continuum polarimetry observations of the nearby edge-on galaxy NGC 253 which possesses a very bright radio halo. Using the vertical synchrotron emission profiles…

astro-ph2008★ 62 cited

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…

astro-ph2008★ 131 cited

Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253 I. The distribution and transport of cosmic rays

V. Heesen, R. Beck, M. Krause +1

The diffusive and convective CR transport in NGC 253 from the disk into the halo is investigated using the local CR bulk speed. The connection between the CR transport and the gala…

astro-ph2008★ 44 cited

A kinematic study of the irregular dwarf galaxy NGC 2366 using HI and Halpha observations

J. van Eymeren, M. Marcelin, B. Koribalski +4

Abridged. Context. The metal content of dwarf galaxies and the metal enrichment of the intergalactic medium both suggest that mass loss from galaxies is a significant factor for th…

astro-ph2008★ 638 cited

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…