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Detection of very high energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+06
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2009 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 499, no 3, p. 723-728Article in journal (Refereed) Published
Abstract [en]

Aims. Detection of gamma-ray source above 300 GeV is reported, confirming the unidentified source MGRO J1908+06, discovered by the Milagro collaboration at a median energy of 20 TeV. Methods. The source was observed during 27 h as part of the extension of the HESS Galactic plane survey to longitudes > 30 degrees. Results. HESS J1908+063 is detected at a significance level of 10.9 sigma with an integral flux above 1 TeV of (3.76 +/- 0.29 (stat) +/- 0.75(sys)) x 10(-12) ph cm(-2) s(-1), and a spectral photon index Gamma = 2.10 +/- 0.07 (stat) +/- 0.2(sys). The positions and fluxes of HESS J1908+063 and MGRO J1908+06 are in good agreement. Possible counterparts at other wavelengths and the origin of the gamma-ray emission are discussed. The nearby unidentified GeV source, GRO J1908+0556 (GeV) which also remains unidentified and the new Fermi pulsar 0FGL J1907.5+0617, may be connected to the TeV source.

Place, publisher, year, edition, pages
2009. Vol. 499, no 3, p. 723-728
Keywords [en]
gamma rays: observations
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30264DOI: 10.1051/0004-6361/200811357ISI: 000266730600013OAI: oai:DiVA.org:lnu-30264DiVA, id: diva2:707004
Available from: 2014-03-24 Created: 2013-11-08 Last updated: 2017-12-05Bibliographically approved

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Becherini, Yvonne

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