|
Description
We present the photometric observations of blazars S5 0716+714 and 3C 273 with high temporal resolution (30-60s) in the I or R bands. The observations were performed with a 1.02m optical telescope from 2007 March 7 to 2012 May 16. The F-test, one-way analysis of variance (ANOVA) test, and z-transformed discrete correlation function (ZDCF) cross-correlation zero lag test are used to search for intra-day variability (IDV). Four and five reliable IDVs survive three tests for S5 0716+714 and 3C 273, respectively. IDVs are found for S5 0716+714 and 3C 273. A flare on 2008 May 8 has {Delta}I~0.06+/-0.01mag in a duration of 0.54hr for S5 0716+714. A flare on 2011 May 10 shows {Delta}R~0.05+/-0.01mag in a duration of 0.40hr for 3C 273. Sharp dips appear on 2011 May 9 for 3C 273 and show {Delta}R~0.05+/-0.01mag. Under the assumptions that the IDV is tightly connected to black hole mass, M*, and that the flare durations are representative of the minimum characteristic timescales, we can estimate upper bounds to M*. In the case of the Kerr black holes, M*<~10^8.91^M_{sun}_ and M*<~10^9.02^M_{sun}_ are given for S5 0716+714 and 3C 273, respectively. These mass measurements are consistent with those measurements reported in the literature. Also, we discuss the origins of optical variations found in this work.
|
