Optical monitoring and IDV analysis of the blazars S50716+714 and 3C 273

• Published in: 天文和天体物理学研究 Vol. 21; no. 4; pp. 219 - 232
• Main Authors: Xiao-Lan Liu, Yu-Hai Yuan, Hong-Ren Huang
• Format: Journal Article
• Language: English
• Published: Center for Astrophysics,Guangzhou University,Guangzhou 510006,China%Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China 2021
• Subjects: quasars:individual (S5 0716+714,3C 273); quasars:general; galaxies:photometry
• ISSN: 1674-4527
• DOI: 10.1088/1674-4527/21/4/102

S50716+714 and 3C 273 are frequently studied blazars,which show obvious optical variabilities with different timescales.Using the 1.0 m telescope at the Yunnan Observatory,we monitored the two sources.For S50716+714,we report 990 observations during the monitoring duration from JD 2458536 to JD 2458540.For 3C 273,there are 884 observations during the monitoring duration from JD 2458539 to JD 2458542.Based on those observations,we obtain the following results.(1) For S50716+714,there lie intra-day optical variabilities (IDVs),with timescales from 0.31 hours to 2.64 hours.For 3C 273,it is possible that there lie IDVs,with timescales from 0.36 hours to 0.49 hours.(2) The time delay of S50716+714 is τ-RI =3.46 min between R and Ⅰ bands,and the time delay of 3C273 is τ-Ⅳ =6.42 min between Ⅰ and Ⅴbands.(3) We find that,for S50716+714,there lies a suspected intra-dayperiod,P ≈ 185.78 min;for 3C 273,there lie intra-day periods,which are about ～ 60 min and ～ 80 min.