Abstract
Historical optical BVRI band data are combined on the BL Lac object AO 0235 + 164. In order to examine the possible existence of lags and correlations between variations in different optical bands from this source, a statistical analysis is performed through the Discrete Correlation Function (DCF) method. Monte Carlo simulations called Flux Redistribution/Random Subset Selection (FR/RSS) are performed to obtain statistically meaningful values for the cross-correlation time lags and their related uncertainties. The analysis confirms that the variations in different optical light curves are strongly correlated, with no or very weak lag within the errors. Long term variability of color indices are also analysed. No color variabilities are found.
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Acknowledgements
The author would like to thank Dr. Liu Wenpo from Civil Aviation University of China for a constructive discussion. He acknowledges the archive data from the Whole Earth Blazar Telescope (WEBT) consortium. This work is supported by the LangFang Municipal Science and Technology Research and Development Program (No. 2012011002), colleges and universities in Hebei province science and technology research project (No. Z2013065).
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Hong-tao, W. Analysis of Optical Variations of BL Lac Object AO 0235+164. J Astrophys Astron 35, 87–95 (2014). https://doi.org/10.1007/s12036-014-9209-9
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DOI: https://doi.org/10.1007/s12036-014-9209-9