Light Variation Analysis Of Blazars

Optical variation is one of the typical characteristics of Blazar.S50716+714,3C 273 and 3C454.3 are frequently studied blazars,which show obvious optical variabilities with different timescales.Using the 1.0m telescope at the Yunnan Observatory,we monitored the two sources.For 3c454.3,we used the 1.26m optical telescope of Guangzhou University National Observatory to complete the observation。We monitored the three sources.For S5 0716+714,we report 990 observations.For 3C273,there are 884 observations.For 3C454.3 there are 4525 observations.Based on those observations,we obtain the following results.(1)For S5 0716+714,there lie intra-day optical variabilities(IDVs),with the timescales from 0.31 hour to 2.64 hour.The maximum variations at the B,V,R and I bands are:ΔBmaz=0.396± 0.001、ΔVmax=0.432 ± 0.051、ΔRmax=0.202 ± 0.006 and ΔImax=0.321 ± 0.029.For 3C 273,it is possible that there lie IDVs,with the timescales from 0.36 hour to 0.49 hour.The maximum variations at the R and I bands are:ΔRmax=0.076±0.02和 ΔImax=0.082±0.012.For 3C454.3,there lie intra-day optical variabilities(IDVs),with the timescale from 0.34 hour to 4.94 hour.The maximum variations at the g,r and i bands are Δgmax=0.623±0.025、Δrmax=1.502± 0.034 和Δimax=0.837± 0.022.(2)The time delay of S5 0716+714 is τRI=3.46 min between R and I band,and the time delay of 3C273 is τIV=6.42 min between I and V band.(3)We find that,for S5 0716+714,there lie a suspected intra-day period,P≈185.78 min;for 3C 273,there lie intra-day periods,which are about～60 min and～80 min.Based on the above,we are carrying out further analysis.With the help of the above results,we can get a deeper understanding of optical variability properties of Blazars.We obtain the IDV time scale,and obtain the IDV period of S5 0716+714 for the first time.We will further study Blazar’s optical variability properties.