VLBI OBSERVATION OF MICROQUASAR CYG X-3 DURING AN X-RAY STATE TRANSITION FROM SOFT TO HARD IN THE 2007 MAY–JUNE FLARE

@article{Kim2013VLBIOO,
  title={VLBI OBSERVATION OF MICROQUASAR CYG X-3 DURING AN X-RAY STATE TRANSITION FROM SOFT TO HARD IN THE 2007 MAY–JUNE FLARE},
  author={Jeong-Sook Kim and Soon-Wook Kim and Tomoharu Kurayama and Mareki Honma and Tetsuo Sasao and Sang Joon Kim},
  journal={The Astrophysical Journal},
  year={2013},
  volume={772}
}
We present a radio observation of microquasar Cyg X-3 during an X-ray state transition from ultrasoft to hard state in the 2007 May–June flare using the VLBI Exploration of Radio Astrometry at 22 GHz. During the transition, a short-lived mini-flare of ≲ 3 hr was detected prior to the major flare. In such a transition, a jet ejection is believed to occur, but there have been no direct observations to support it. An analysis of Gaussian fits to the observed visibility amplitudes shows a time… 

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