Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.0902t&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #09.02; Bulletin of the American Astronomical Society, Vol. 26, p.871
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations with the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory show more than 30 unidentified sources of E>100 MeV gamma rays concentrated along the galactic plane (Fichtel et al., 1994, ApJS, in press). Based on their spatial distribution, their typical distances are 2-6 kpc. Combining these distances with the observed gamma-ray fluxes gives luminosities above 100 MeV in the range (0.1 - 1) x 10(36) ergs/s. These derived luminosities are higher than those of most of the observed gamma-ray pulsars, even when substantial beaming is considered. It is unlikely, therefore, that most of these sources closely resemble Geminga, which is an older, nearby pulsar with a total spin-down luminosity dot E of only 3 x 10(34) ergs/s and an approximate gamma-ray luminosity of 2 x 10(33) ergs/s for an assumed distance of 250 pc. If these sources are undiscovered pulsars, they are probably younger and more distant, with the principal similarity to Geminga being that they h ave no observable radio pulse. For most of these, finding an unknown short-period pulsation with the gamma-ray data alone will be extremely difficult.
Bertsch David L.
Dingus Brenda Lynn
Esposito Joseph A.
Fichtel Carl E.
Fierro J. M.
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