Variability Study of the S5 Sample

Journal of astrophysics and astronomy

Jun Liu1 2 3¹  Zhen Ding1¹  Lang Cui1¹  Xiang Liu1¹  Hua-Gang Song1¹ 

[1] Xinjiang Astronomical Observatory, CAS, 150 Science 1-Street, Urumqi 830011, China.$$

关键词: Galaxies: active;    quasars: general;    radio continuum: galaxies.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

We present the results of flux density monitoring of the S5 sample at 5GHz with the Urumqi 25-m radio telescope during Dec. 2008 and Nov. 2009. Most sources exhibited > 2% rms variation in our one-year monitoring. Twenty-five highly variable sources were detected at a confidence level of 99%. Weaker sources show larger amplitude of variability. Sources that have a steep spectral index are not as variable in flux density as the flat spectrum objects. No galactic dependent variability was found. Supplemental IDV observations for several strong variables were performed in order to search for possible rapid variability, and to compare variability on different time-scales. The absence of short time-scale variability in S5 0633+73 indicates that mid time-scale variability is a main source of intrinsic origin.

【 授权许可】

Unknown