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The Optical Variability of the BL Lac AO 0235+164

Center for Astrophysics, Guangzhou University, Guangzhou 510006, China
Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province, Guangzhou 510006, China
Abastumani Observatory, Mt. Kanobili, Abastumani 0301, Georgia
Engelhardt Astronomical Observatory, Kazan Federal University, Tatarstan 420000, Russia
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, Potsdam 14482, Germany
Faculty of Physics and Electronic Information, LangFang Teacher’s College, China
Department of Astronomy, Boston University, Boston, MA 02215, USA
National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100864, China
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 17;
Received: 14 July 2016 / Revised: 17 August 2016 / Accepted: 18 August 2016 / Published: 30 August 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
PDF [1295 KB, uploaded 30 August 2016]


In this work, we present optical R band observations of AO 0235+164 carried out during the period of November 2006 to December 2012 using the Ap6E CCD camera attached to the primary focus of the 70 cm meniscus telescope at Abastumani Observatory, Georgia. It shows a large variation of Δ R = 4.88 mag (14.19–19.07 mag) and a short time scale of Δ T v = 73.5 min during our monitoring period. When periodicity analysis methods are applied to the R-band data from both historic and our observations, periods P 1 = 8.26 yr and P 2 = 0.54 yr are found. View Full-Text
Keywords: galaxies; BL Lacertae objects; individual (AO 0235+164); photometry; variability galaxies; BL Lacertae objects; individual (AO 0235+164); photometry; variability

Figure 1

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Fan, J.; Kurtanidze, O.; Liu, Y.; Liu, X.; Richter, G.M.; Nikolashvili, M.G.; Kurtanidze, S.O.; Chanishvili, R.; Wang, H.; Sasada, M.; Zhou, A.; Lin, C.; Yuan, Y. The Optical Variability of the BL Lac AO 0235+164. Galaxies 2016, 4, 17.

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