Observation of the Monoceros Loop SNR region with the HEGRA system of IACTs

Details Observation of the Monoceros Loop SNR region with the HEGRA system of IACTs Observation of the Monoceros Loop SNR region with the HEGRA system of IACTs

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...417..973a&link_type=abstract

Astronomy and Astrophysics, v.417, p.973-979 (2004)

Astronomy and Astrophysics

Astrophysics

4

Gamma Rays: Observations, Ism: Supernova Remnants, Ism: Individual Objects: Monoceros Loop Snr

Scientific paper

The array of 5 imaging atmospheric Čerenkov telescopes (IACTs) deployed at La Palma (Canary Islands), and operated by the HEGRA (High Energy Gamma Ray Astronomy) collaboration, was used for observations of the Monoceros Loop SNR region for a total of about 120 hrs and 20 hrs in ON-source and OFF-source mode, respectively. The giant molecular cloud Rosette Nebula appears in the sky region, close to the south-east part of the SNR rim. Using the HEGRA system of IACTs of rather large field of view (4.3 degree in diameter), we have mapped the extended sky region of 3o × 3o associated with the Monoceros SNR/Rosette Nebula, which is centered towards the hard spectrum X-ray point source SAX J0635+533. The EGRET unidentified source of diffuse γ-ray emission (3EG J0634+0521) observed in the energy range between 100 MeV-10 GeV, was effectively in the field of view of our present observations. Also, the GeV source GeV J0633+0645 was within the available field of view. The performance of the IACTs array reveals an energy threshold of 500 GeV and an angular resolution of 0.1o for γ-rays. In what follows, we present the result of the data analysis and its physical interpretation.

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