Discovery of a point-like very-high-energy gamma-ray source in Monoceros

Details Discovery of a point-like very-high-energy gamma-ray source in Monoceros Discovery of a point-like very-high-energy gamma-ray source in Monoceros

2007-04-02

arxiv.org/abs/0704.0171v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, to appear in A&A

Scientific paper

10.1051/0004-6361:20077299

The complex Monoceros Loop SNR/Rosette Nebula region contains several potential sources of very-high-energy (VHE) gamma-ray emission and two as yet unidentified high-energy EGRET sources. Sensitive VHE observations are required to probe acceleration processes in this region. The H.E.S.S. telescope array has been used to search for very high-energy gamma-ray sources in this region. CO data from the NANTEN telescope were used to map the molecular clouds in the region, which could act as target material for gamma-ray production via hadronic interactions. We announce the discovery of a new gamma-ray source, HESS J0632+058, located close to the rim of the Monoceros SNR. This source is unresolved by H.E.S.S. and has no clear counterpart at other wavelengths but is possibly associated with the weak X-ray source 1RXS J063258.3+054857, the Be-star MWC 148 and/or the lower energy gamma-ray source 3EG J0634+0521. No evidence for an associated molecular cloud was found in the CO data.

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