Optical flux behaviour of a sample of Fermi blazars

Authors :: Marchesini, E. J.
Andruchow, I.
Cellone, S. A.
Combi, J. A.
Zibecchi, L.
Martí, J.
Romero, G. E.
Muñoz-Arjonilla, A. J.
Luque-Escamilla, P.
Sánchez-Sutil, J. R.
Source :: A&A 591, A21 (2016)
Publication Year :: 2016
Abstract: Aims: We aim at investigating the time-behaviour of a sample of gamma-ray blazars. We present the results from a 13 month-long optical photometry monitoring campaign of the blazars PKS 0048-097, PKS 0754+100, HB89 0827+243, PKS 0851+202, PKS 1253-055, PKS1510-089, PKS 1749+096, PKS 2230+114 and PKS 2251+158. Methods: We analyse the variability of each object, focusing on different time-scales (long term, short term, and microvariability), in an attempt to achieve a statistical comparison of the results. Results: After applying a geometric model to explain the variability results, we found that it is possible that a slight change in the direction of the jet generates the variations detected in some objects during this campaign.<br />Comment: 8 pages, 1 figure, accepted for publication in A&A