Observation of VHE γ-rays from Cassiopeia A with the MAGIC telescope
Abstract
Aims:We searched for very high energy (VHE) γ-ray emission from the supernova remnant Cassiopeia A
Methods: The shell-type supernova remnant Cassiopeia A was observed with the 17 m MAGIC telescope between July 2006 and January 2007 for a total time of 47 h.
Results: The source was detected above an energy of 250 GeV with a significance of 5.2σ and a photon flux above 1 TeV of (7.3 ± 0.7_stat ± 2.2_sys) × 10-13 cm-2s-1. The photon spectrum is compatible with a power law dN/dE ∝ E-Γ with a photon index Γ = 2.3 ± 0.2_stat ± 0.2_sys. The source is point-like within the angular resolution of the telescope.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 2007
- DOI:
- arXiv:
- arXiv:0706.4065
- Bibcode:
- 2007A&A...474..937A
- Keywords:
-
- acceleration of particles;
- ISM: cosmic rays;
- gamma rays:;
- observations;
- ISM: individual objects:;
- Cassiopeia A;
- ISM: supernova remnants;
- Astrophysics
- E-Print:
- 4 pages, 4 figures, submitted to A&