Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-15
High Energy Gamma-Ray Astronomy: 2nd International Symposium, Proceedings of the conference held 26-30 July 2004 in Heidelberg
Astronomy and Astrophysics
Astrophysics
15 pages, 5 figures, 1 table
Scientific paper
10.1063/1.1878408
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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