Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006chjaa...6....1q&link_type=abstract
Chinese Journal of Astronomy and Astrophysics, Volume 6, Issue 1, pp. 1-14 (2006).
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
A very rapid polarization position angle swing of ~180° (with a time scale of ~6 hours) observed at 2 cm in QSO 1150+812 (z = 1.25) was reported by Kochenov & Gabuzda. This very rare event is difficult to explain. We found a possible interpretation in the framework of a source model consisting of three polarized components, in which two compact polarized components are nearly simultaneously occulted by an interstellar cloud, with consequent focusing-defocusing effects. A specific plasma-lens model is proposed which can reasonably fit the polarized flux density curve with results derived for the two lensed components. Some physical parameters of the plasma-lens and the source components are estimated. The two compact polarized components are estimated to have brightness temperatures of ~6×1012 K. Thus a bulk relativistic motion with a Lorentz factor less than 10 is required to meet the inverse Compton limit.
Beckert Th.
Britzen Silke
Cimò Giuseppe
Fuhrmann Lars
Kraus Adam
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