Understanding the nature of the unidentified EGRET source 3EG J1631-4033

Astronomy and Astrophysics – Astrophysics

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Chandra Proposal Id #04508160

Scientific paper

The EGRET unidentified sources represent one of the most challenging enterprises of the modern astrophysics. In the 3rd EGRET catalog there are 271 sources, 170 of them are still unidentified. The identified sources are mainly blazars (93) and pulsars (5). Now that the most probable sources are identified, it remains to understand if there are other populations of objects able to generate high energy (E>100 MeV) gamma-rays, or if there are different engines powering known objects, like - for example - transition objects between FRI radio galaxies and BL Lac or off-beam gamma-ray pulsars of the Gould belt. Given the high-energy gamma-ray (EGRET) and the hard-X (ISGRI) spectral and temporal characteristics, this source could be the first example of off-beam gamma-ray pulsars of the Gould Belt, predicted by several authors like I. Grenier, N. Gehrels, A. Harding, et al.

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