Abstract
Aims. Detection of a γ-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°. Results. HESS J108+063 is detected at a significance level of 10.9σ with an integral flux above 1 TeV of (3.76 ± 0.29 stat Plusmn: 0.75 sys ) × 10-12 ph cm-2 s-1, and a spectral photon index Γ = 2.10 ± 0.07 stat ± 0.2sys. 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 γ-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.
| Original language | English |
|---|---|
| Pages (from-to) | 723-728 |
| Number of pages | 6 |
| Journal | Astronomy and Astrophysics |
| Volume | 499 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jan 2009 |
| Externally published | Yes |
Keywords
- Gamma rays
- Observations
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