Report

Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303

Science  23 Jun 2006:
Vol. 312, Issue 5781, pp. 1771-1773
DOI: 10.1126/science.1128177

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Abstract

Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.

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