The High-Energy Gamma-Ray Source at the Galactic Center

Details The High-Energy Gamma-Ray Source at the Galactic Center The High-Energy Gamma-Ray Source at the Galactic Center

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gcnew...4....3m&link_type=abstract

GCNEWS - Galactic Center Newsletter, vol. 4, p. 3 (eds. A. Cotera & H. Falcke)

Computer Science

1

Galactic Center, Sgr A*, Egret, Gamma Rays

Scientific paper

In the course of a full-sky survey, the Energetic Gamma Ray Experiment Telescope (EGRET) aboard the Compton Gamma Ray Observatory detected a high-energy (30 MeV - 30 GeV) gamma-ray excess, 2EG J1746-2852, which is consistent in position with the Galactic center (within 0.2 degrees of l=0.05, b=-0.05, with 95% confidence). The proximity indicates that it is probably associated with the Galactic center. The excess is observed to be distributed as the EGRET point spread function. The flux is 1.1+/-0.1*10^-6 photons cm^-2 s^-1, corresponding to a high-energy gamma-ray luminosity of ~5*10^36 ergs/s if it is at the Galactic center. It is possible that the gamma-ray emission is due to the ~10^6 M_sun black hole candidate Sgr A*, but there is not significant evidence of variability to confirm this. A diffuse origin within a ~100 pc distance of the Galactic center is also possible.

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