Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and laboratories for elucidating the physics of relativistic jets. Here 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, suggesting 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 the absorption processes.
Variable Very High Energy Gamma-Ray Emission from the Microquasar LS I +61 303
BASTIERI, DENIS;BIGONGIARI, CIRO;DAZZI, FRANCESCO;DORO, MICHELE;LOMBARDI, SAVERIO;MARIOTTI, MOSE';PASCOLI, DONATELLA;PERUZZO, LUIGI;E. PRANDINI;SAGGION, ANTONIO;SARTORI, PAOLO;SCALZOTTO, VILLI MARIO;
2006
Abstract
Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and laboratories for elucidating the physics of relativistic jets. Here 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, suggesting 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 the absorption processes.File in questo prodotto:
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