Multiband optical polarimetry of BL Lac objects with the Nordic Optical Telescope

Details Multiband optical polarimetry of BL Lac objects with the Nordic Optical Telescope Multiband optical polarimetry of BL Lac objects with the Nordic Optical Telescope

2001-07-02

arxiv.org/abs/astro-ph/0107017v1

Astronomy and Astrophysics

Astrophysics

11 pages, 7 figures, accepted to Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20010940

Optical polarization of seven selected BL Lac objects in UBVRI bands was studied with the Nordic Optical Telescope from December 10-14, 1999. Two of them, 3C 66A and PKS 0735+178, were monitored for 4 nights for a total integration time of 4.75 and 5.5 hours, respectively. Other objects (1Jy 0138-097, H 0414+009, PKS 0823-223, OJ287 and BL Lac) were observed sparsely during the run. Apart from PKS 0823-223 (more polarized than observed in the past), the sources show levels of flux and polarization consistent with results at previous epochs. 3C 66A and PKS 0735+178 were intensively observed during December 11 and 12 and exhibited variability of polarization, both on internight and intranight time scales. Wavelength dependence of polarization has been investigated, as well as circular polarization. The results are discussed within the standard model for BL Lacs.

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