Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.297..283z&link_type=abstract
Astrophysics and Space Science, Volume 297, Issue 1-4, pp. 283-290
Astronomy and Astrophysics
Astrophysics
1
Γ Rays: Unidentified, Γ-Ray Sources, &Gamma, Rays: Unidentified, -Ray Sources
Scientific paper
A major legacy of the EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) is the detection of a large number of unidentified Gamma-ray sources. Out of the 271 EGRET sources are 170 not identified yet [Hartman et al. ApJS (123) (1999) 79]. To provide additional information on these unidentified EGRET sources, we derived simultaneous MeV fluxes or flux limits for each source by analyzing the contemporaneous COMPTEL data. Then we compare these MeV fluxes to the extrapolations of the published EGRET spectra. Our results can be grouped into 4 categories [Zhang et al. A&A (421) (2004) 983]: (1) non-constraining upper limits (˜120 sources), (2) hints (> 2 sigma) or detections with consistent MeV fluxes (˜16 sources), (3) enhanced MeV emission (2 sources), and (4) constraining MeV flux limits, requiring a spectral break (˜22 sources). In summary, for about 40 of the unidentified EGRET sources we can provide supplementary spectral information in the neighboring gamma-ray band, which together with other source parameters might provide clues to the underlying source nature.
Collmar Werner
Schonfelder Volker
Zhang Shu
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