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Title:
On the nature of the unidentified EGRET sources: Are they Geminga-like pulsars?
Authors:
Mukherjee, R.; Bertsch, D. L.; Dingus, B. L.; Kanbach, G.; Kniffen, D. A.; Sreekumar, P.; Thompson, D. J.
Affiliation:
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AC(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AD(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AE(Hampden-Sydney College, Hampden-Sydney, VA, US), AF(Hampden-Sydney College, Hampden-Sydney, VA, US), AG(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 2, p. L61-L64 (ApJ Homepage)
Publication Date:
03/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
GAMMA RAY ASTRONOMY, GAMMA RAYS, MILKY WAY GALAXY, POINT SOURCES, PULSARS, SPATIAL DISTRIBUTION, ASTROMETRY, DISTANCE, GAMMA RAY OBSERVATORY, STELLAR LUMINOSITY
DOI:
10.1086/187790
Bibliographic Code:
1995ApJ...441L..61M

Abstract

Observations with the Energetic Gamma Ray Experiment Telescope (EGRET) aboard the Compton Gamma Ray Observatory (CGRO) show more than 30 unidentified gamma-ray sources concentrated along the Galactic plane. Based on their spatial distribution, the typical distances of the sources are found to be between 1.2 and 6 kpc. Luminosity estimates made using the estimated distances of the sources and their observed gamma-ray fluxes lie in the range (0.7-16.7) x 1035 ergs/s. These values, on the average, appear to be higher than the luminosities of the gamma-ray pulsars observed by EGRET. The luminosity estimates indicate that the low-latitude unidentified EGRET sources cannot be explained as a group of older, low-luminosity pulsars like Geminga, although the high-latitude sources may be candidates.

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