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On The Origin Of Unidentified EGRET Gamma-Ray Sources

By SpaceRef Editor
August 10, 2005
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Astrophysics, abstract

From: O. Reimer [view email]
Date: Wed, 15 Jun 2005 23:54:05 GMT (438kb)

On The Origin Of Unidentified EGRET Gamma-Ray Sources

Olaf Reimer

Comments: 15 pages, 5 figures, 1 table

Journal-ref: High Energy Gamma-Ray Astronomy: 2nd International Symposium,
Proceedings of the conference held 26-30 July 2004 in Heidelberg (Germany).
Edited by Felix A. Aharonian, Heinz J. Voelk, and Dieter Horns. AIP
Conference Proceedings, Volume 745. New York: American Institute of Physics,
2005., p.184-198

The identification of celestial gamma-ray sources with astronomical objects
or object classes has remained the initial and most fundamental key for
understanding their physical nature. The observational characteristic of a
gamma-ray emitter and the conditions under which an astronomical object is able
to produce energetic gamma-ray emission defines the range of candidates
available for source identifications. The main obstacle must be seen in the
fact that a gamma-ray source location is often imprecise, a flux history could
only be established on the basis of weeks, and uncertainties in the gamma-ray
observables are considerably large. Therefore coordinated multifrequency
follow-up campaigns or spatial-statistical methods are required to assign
proper counterpart identifications. Although Active Galactic Nuclei and pulsars
are uniquely identified EGRET sources, many other gamma-ray sources still
remain unidentified. I will review properties of the population and highlight
the characteristics of potential counterparts of the still unidentified
gamma-ray sources detected by EGRET.

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