Extreme photo-polarimetric behaviour of the blazar AO 0235+164

Details Extreme photo-polarimetric behaviour of the blazar AO 0235+164 Extreme photo-polarimetric behaviour of the blazar AO 0235+164

2007-07-17

arxiv.org/abs/0707.2599v1

MNRAS (Letters) 381 (2007) L60-L64.

Astronomy and Astrophysics

Astrophysics

Accepted by MNRAS (Letters), 5 pages

Scientific paper

10.1111/j.1745-3933.2007.00366.x

We present optical photo-polarimetric observations with high temporal resolution of the blazar AO 0235+164. Our data, the first to test the photo-polarimetric behaviour of this object at very short time-scales, show significant micro-variability in total flux, colour index, linear polarization degree, and position angle. Strong inter-night variations are also detected for these parameters. Although no correlation between colour index and total flux was found, our data seem to support the general bluer-when-brighter trend already known for this object. The polarization degree, in turn, shows no correlation with total flux, but a clear trend in the sense that colour index is redder (the spectrum is softer) when the measured polarization is higher.

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