Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2915w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #29.15; Bulletin of the American Astronomical Society, V
Other
Scientific paper
Cygnus X-3 is a famous relativistic jet source, which often undergoes large radio flares of up to 30 Janskys. Previous observations (Mioduszewski et al. 2001, ApJ, 553) of this source with the Very Long Baseline Array (VLBA) showed strong evidence for a one-sided southern jet, while Very Large Array (VLA) observations (Martí et al. 2006, A&A, 451) showed a double-sided jet, stronger to the north. This is puzzling, since other famous microquasar sources have always been consistent in showing highly symmetric, double-sided jets. To address this issue, multi-epoch VLA imaging before and after two major flares of Cygnus X-3 at 8.5 GHz will be presented and compared with previous radio observations. After a flare of about one Jansky we observed a double-sided jet, dominated strongly to the south, but after a later flare of 17 Janskys we observed a double-sided jet, dominated to the north. We will discuss further the nature of the apparent changes in jet dominance and whether these variations are due to the source itself or its environment or some combination of both. We will also discuss jet speed, flux evolution, and the first detection of linear polarization in this source.
Mioduszewski Amy
Rupen Michael
Whiting Catherine A.
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