HESS J1848-018: Discovery Of VHE γ-ray Emission From The Direction Of W 43

Details HESS J1848-018: Discovery Of VHE γ-ray Emission From The Direction Of W 43 HESS J1848-018: Discovery Of VHE γ-ray Emission From The Direction Of W 43

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..372c&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

7

Astronomical And Space-Research Instrumentation, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Gamma-Ray

Scientific paper

The extended H.E.S.S. Galactic Plane Survey has resulted in the discovery of numerous very-high-energy (VHE E>100 GeV) γ-ray emitting sources. One of the most recent discoveries is HESS J1848-018, which is detected with a post-trial significance of over 5 σ. HESS J1848-018 is found to be significantly extended with respect to the H.E.S.S. point spread function (~0.1°) and has a complex morphology. An extensive search for multi-wavelength counterparts (from radio to X-ray) has found it to be in the direction of, but slightly offset from, the star-forming region W 43, which hosts a giant HII region (G30.8-0.2), a giant molecular cloud, and the Wolf-Rayet star WR 121a in the main stellar cluster. If HESS J1848-018 is indeed associated with W 43, it would be only the second known case, after Westerlund 2, of VHE γ-ray emission associated with a star-forming region. We report on the details of this new detection, including a comprehensive analysis of the multi-wave length data currently available.

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