| Issue |
A&A
Volume 396, Number 3, December IV 2002
|
|
|---|---|---|
| Page(s) | 923 - 928 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021434 | |
| Published online | 05 December 2002 | |
An unidentified variable gamma-ray source near the galactic plane detected by COMPTEL
1
Max-Planck-Institut für extraterrestrische Physik, PO Box 1603, 85740 Garching, Germany
2
High Energy Astrophysics Lab, Institute of High Energy Physics, PO Box 918-3, Beijing 100039, PR China
Corresponding author: S. Zhang, szhang@mail.ihep.ac.cn
Received:
13
May
2002
Accepted:
1
October
2002
We report the detection of an unidentified γ-ray source near the Galactic plane by the COMPTEL experiment aboard the Compton Gamma-Ray Observatory. The source is detected at a significance level of ~7.2σ in the energy range 1–3 MeV and at ~4.6σ in the lower 0.75–1 MeV band in the time period March to July 1995. At energies above 3 MeV are only marginal hints or upper limits obtained. The MeV spectrum has a soft shape. Strong flux variability is found within one year at energies below 3 MeV. Possible counterparts of galactic and extragalactic nature are discussed.
Key words: γ rays: observations
© ESO, 2002
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