Peculiar Physical Properties of HST-1 in M87

Details Peculiar Physical Properties of HST-1 in M87 Peculiar Physical Properties of HST-1 in M87

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011japa...32...25c&link_type=abstract

Journal of Astrophysics and Astronomy, Volume 32, Issue 1-2, pp. 25-28

Astronomy and Astrophysics

Astrophysics

Polarization, Galaxies: Active, Galaxies: Individual (M87), Galaxies: Jets, Radio Continuum: Galaxies

Scientific paper

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 1.23 c±0.91 c, 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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