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Radio and optical intra-day variability observations of five blazars

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We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on December 18--21, 2015 by using the radio telescope in Effelsberg (Germany) and several optical telescopes in Asia, Europe, and...

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Bibliographic Details
Main Authors: Liu, Xiang (Author) , Kurtanidze, Omar M. (Author)
Format: Article (Journal) Chapter/Article
Language:English
Published: 2017
In: Arxiv

Online Access:Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1705.00124
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Author Notes:X. Liu, P.P. Yang, J. Liu, B.R. Liu, S.M. Hu, O.M. Kurtanidze, S. Zola, A. Kraus, T.P. Krichbaum, R.Z. Su, K. Gazeas, K. Sadakane, K. Nilson, D.E. Reichart, M. Kidger, K. Matsumoto, S. Okano, M. Siwak, J.R. Webb, T. Pursimo, F. Garcia, R. Naves Nogues, A. Erdem, F. Alicavus, T. Balonek, and S.G. Jorstad

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520 |a We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on December 18--21, 2015 by using the radio telescope in Effelsberg (Germany) and several optical telescopes in Asia, Europe, and America. After calibration, the light curves from both 5 GHz radio band and the optical R band were obtained, although the fdata were not smoothly sampled over the sampling period of about four days. We tentatively analyse the amplitudes and time scales of the variabilities, and any possible periodicity. The blazars vary significantly in the radio (except 3C66A and BL Lacertae with only marginal variations) and optical bands on intra- and inter-day time scales, and the source B0925+504 exhibits a strong quasi-periodic radio variability. No significant correlation between the radio- and optical-band variability appears in the five sources, which we attribute to the radio IDV being dominated by interstellar scintillation whereas the optical variability comes from the source itself. However, the radio- and optical-band variations appear to be weakly correlated in some sources and should be investigated based on well-sampled data from future observations. 
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