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The Correlated Multi-color Optical Variations of BL Lac Object S5 0716+714

Published online by Cambridge University Press:  02 January 2013

Bingkai Zhang*
Affiliation:
Department of Physics, Fuyang Normal University, Fuyang 236041, China
Benzhong Dai
Affiliation:
Department of Physics, Yunnan University, Kunming 650091, China
Li Zhang
Affiliation:
Department of Physics, Yunnan University, Kunming 650091, China National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
Jiali Liu
Affiliation:
The Key Laboratory of Particle and Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Zhen Cao
Affiliation:
The Key Laboratory of Particle and Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
*
ECorresponding author. Email: zhangbk@mail.ihep.ac.cn
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Abstract

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S5 0716+714 is a well-studied BL Lac object in the sky. Verifying the existence of correlations among the flux variations in different bands serves as an important tool to investigate the emission processes. To examine the possible existence of a lag between variations in different optical bands on this source, we employ a discrete correlation function analysis on the light curves. In order to obtain statistically meaningful values for the cross-correlation time lags and their related uncertainties, we perform Monte Carlo simulations called ‘flux redistribution/random subset selection’. Our analysis confirms that the variations in different optical light curves are strongly correlated. The time lags show a hint of the variations in high frequency band leading those in low frequency band of the order of a few minutes.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2010

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