The Optical Variability Properties of TeV Blazars  

作　　者：Zi-An Su Wen-Xin Yang Xiang-Tao Zeng Le-Jian Ou Ze-Lin Li Jiang-He Yang Jun-Hui Fan 

机构地区：[1]Department of Physics,School of Physics and Electronics,Hunan Normal University,Changsha 410081,China [2]Center for Astrophysics,Guangzhou University,Guangzhou 510006,China [3]Greater Bay Brand Center of the National Astronomical Data Center,Guangzhou 510006,China [4]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China [5]College of Microelectronics,Feicuihu Campus of Hefei University of Technology,Hefei 230601,China [6]College of Mathematics and Physics Science,Hunan University of Arts and Science,Changde 415000,China

出　　处：《Research in Astronomy and Astrophysics》2024年第9期66-75,共10页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,grant Nos.U2031201,12433004,11733001,U2031112,12133004,and 12103012);Guangdong Major Project of Basic and Applied Basic Research(grant No.2019B030302001);the science research grants from the China Manned Space Project with NO.CMS-CSST-2021-A06;supported by the Key Laboratory for Astronomical Observation and Technology of Guangzhou。

摘　　要：Variability is one of the typical observational properties of blazars and the spectral changes are usually associated with variability,although this kind of association is unclear yet.In this work,we used data from the Steward Observatory blazar monitoring program to investigate the optical variability properties including the short-term timescale,the brightness-dependent spectral property,the correlation between the the brightness variation and the polarization,and then estimate the Doppler factors based on the obtained short timescale to study the polarization property for a sample of 20 TeV blazars.Our analyses arrive at the following results:(1)The largest variation amplitude in R-band,ΔR_(M),covers a range from ΔR_(M)=0.29 mag(1ES 2344+514)to ΔR_(M)=4.66 mag(3C 279).(2)Intra-day variability was found from five sources with timescales from 0.14 day for S50716+714 to 0.98 day for PKS 2155-304.Sixteen sources show spectra that are bluer when they become brighter,suggesting a common bluer-when-brighter property.(3)The plot of the polarization versus estimated Doppler factor is consistent with the Doppler factor dependent formula of polarization.(4)The largest polarization is correlated with the largest optical variation,suggesting that the high polarization and high amplitude variation are both the indicator of beaming effect.

关 键 词：galaxies:active galaxies:jets radiation mechanisms:non-thermal 

分 类 号：P152[天文地球—天文学]