Search for Hard X-Ray Emission from Aquila X-1. High Energy Emission from Gamma-Ray Radio Star 2CG 135+1/LSI 61 303

Astronomy and Astrophysics – Astronomy

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X Rays, Gamma Ray Bursts, Gamma Ray Astronomy, Gamma Ray Observatory, Gamma Rays, Radio Stars, Emission Spectra, X Ray Astronomy, Synchrotron Radiation, Light Emission, Massive Stars, Peculiar Stars, Blazars

Scientific paper

The investigation consists of different projects carried out during the Cycle 5 GRO observing phase. EGRET, COMPTEL and BATSE studies of unidentified gamma ray sources resulted in the discovery of a new gamma ray transient near the Galactic plane, GRO J1838-0145. We show that this new transient and the time-variable gamma ray sources GRO J1021-58, GRO J1813-12, and GRO J1828+01, are not associated with radio-loud spectrally flat blazar-like counterparts. A GRO study of the gamma ray source 2CG 135+1 is aimed at studying the time-variable gamma ray emission from the source possible associated with the peculiar radio counterpart/massive star LSI 61 303. A BATSE study of the hard X-ray emission from X-ray bursters aimed at detecting and interpreting this emission. The object Aquila X-1 is of particular importance. We recently discovered a prominent hard X-ray outburst from Aquila X-1 correlated with soft X-ray and optical emission. A study of galactic superluminal X-ray transients discovered several prominent radio flares from GRS 1915+105 that turn out to be strongly correlated with hard X-ray emission. Finally, a new model of gamma-ray burst (GRB) emission is being developed, based on synchrotron emission of impulsively accelerated particles.

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