Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.421.3111z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 421, Issue 4, pp. 3111-3115.
Astronomy and Astrophysics
Astronomy
Methods: Statistical, Bl Lacertae Objects: General, Bl Lacertae Objects: Individual: S5 0716+714
Scientific paper
The intraday optical variability of the BL Lacertae object S5 0716+714 is studied using historical light curves. The well-sampled intranight data set is selected. In total, 19 333 data points have been collected over 208 nights. The source exhibits strong variability in the optical band. At a confidence level of 99.9 per cent, for 162 of the 208 nights the source shows intranight variability. The source varies with an increasing rate of 0.043 mag h-1 and a decreasing rate of 0.036 mag h-1 during the observations, with no evident difference between rising and falling parts. The fast variability is found on JD 245 1909, with a decreasing rate of 0.015 mag min-1 over 6 min. The temporal characteristic is studied by using the structure function method. The result shows that the source varies with an 11.5-min time-scale. For this source, the emission size is estimated to be 1.39 × 1014 cm, the mass of the central black hole is estimated to be 107.87 M&sun; and the magnetic field strength is estimated to be 10.6 G.
Cao Zhoujian
Dai Ben Zhong
Wang P. L.
Zhang Bing-Kai
Zhang Lianchang
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