Other
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..270t&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Other
1
Scientific paper
LSI+61o303 is one of the more unusual known massive X-ray binary systems. It undergoes nonthermal radio outbursts every 26.5 days, attributed to the eccentric orbit of a gravitationally collapsed object orbiting within the dense circumstellar envelope of the B0e star primary. The relative γ-ray to X-ray luminosity of the system is far higher than in any other known X-ray binary system, indicating a fundamentally different energy production mechanism. Despite several VLBI studies, the properties of the radio emission region remain unclear. Observations near peak flux density reveal a very compact source, ~1 mas in size, implying a low rate of expansion a few hundred km s-1. Other data imply expansion at velocities of order ~0.06c and deceleration upon reaching dimensions of 2 mas. A clear picture of the evolving radio emission, linking these diverse results remains elusive. A difficulty with past VLBI studies is that the variability time scale is short compared to the time required to obtain visibility coverage sufficient for imaging. In this paper we report on observations with the HALCA spacecraft and a global array of ground radio telescopes that provide instantaneous 2-dimensional visibility coverage. These data have been used to obtain, high-resolution, multi-epoch images during a radio outburst over a period of 48 hours, allowing, for the first time, a picture of the dynamical evolution of the outburst ejecta from LSI +61o303 on mas scales.
Dougherty Sean M.
Paredes Javier M.
Peracaula Marta
Scott William K.
Taylor Russ A.
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