Sort Term Time-Variability of Galactic High Energy Gamma-Ray Sources

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Scientific paper

Studies of the EGRET high-energy galactic gamma-ray sources have been undertaken in order to examine the possibility of other classes besides the established pulsars. The question is whether the time variability of unidentified sources is characteristically different from that of the pulsars. A secondary issue is that if there is a separate class, what is the nature of the sources and their emission mechanisms? At least one object of a distinctly different class has been established with the gamma-ray source 2CG 135+01, believed to be associated with the radio flaring Be star system LSI 61 303. Another candidate class is AGN, over 50 of which have been seen in gamma-rays and which are known to be variable in gamma rays on a timescale of days and longer. In the absence of better spatial resolution time variability is a key in making additional identifications and classifications. To do this, flux histories have been studied down to one-day timescales. The results are compared with those of the known classes.

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