Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-09
Astrophys.Space Sci. 278 (2001) 135-138
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, ApJ accepted
Scientific paper
10.1023/A:1013182006857
We report strong variability in the circular and linear polarization of the intraday variable source PKS 1519-273. The circular polarization varies on a timescale of hours to days at frequencies between 1.4 and 8.6 GHz, and is strongly correlated with variations in the total intensity at 4.8 and 8.6 GHz. We argue that the variability is due to interstellar scintillation of a highly compact (15-35 \mu as) component of the source with -3.8\pm 0.4% circular polarization at 4.8 GHz. We find that no simple model for the circular polarization can account for both the high magnitude and the frequency dependence in PKS 1519-273 at centimeter wavelengths.
Jauncey David L.
Kedziora-Chudczer Lucyna
Macquart Jean-Pierre
Rayner David P.
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