Peculiar Physical Properties of HST-1 in M87


We report on VLA observations of HST- 1 in M87 at 8 GHz from 2003-2007, during which a long major outburst occurs from radio to X-ray wave bands. At the VLA resolution, the flux density of HST- 1 rises rapidly from 2003, peaks at the end of 2004, and then falls slowly in subsequent stages, which is similar to that in optical and X-ray wave bands. It appears that HST- 1 moves with an apparent speed of 1.23c +/- 0.91c, and the fractional polarization keeps rising through the whole major outburst. The persistent increase in polarization level may mainly be attributed to the formation of a couple of new 'subcomponents' of relatively high degree of polarization within HST- 1, and the weakening depolarization due to Faraday rotation and/or opacity through the whole major outburst

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Shanghai Astronomical Observatory,Chinese Academy of Sciences

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