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Variability Study of the S5 Sample

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Abstract

We present the results of flux density monitoring of the S5 sample at 5 GHz 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.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 11073036), the 973 Program of China (2009CB824800) and the program of the light in China’s western region (LCWR) under grant XBBS201024.

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Authors and Affiliations

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

    Jun Liu, Lang Cui, Xiang Liu, Zhen Ding & Hua-Gang Song

  2. Key Laboratory of Radio Astronomy, CAS, Nanjing, 210008, China

    Jun Liu, Lang Cui, Xiang Liu, Zhen Ding & Hua-Gang Song

  3. University of Chinese Academy of Sciences, Beijing, 10049, China

    Jun Liu

Authors
  1. Jun Liu
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  2. Lang Cui
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  3. Xiang Liu
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  4. Zhen Ding
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  5. Hua-Gang Song
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Correspondence to Jun Liu.

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Liu, J., Cui, L., Liu, X. et al. Variability Study of the S5 Sample. J Astrophys Astron 35, 247–251 (2014). https://doi.org/10.1007/s12036-014-9203-2

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  • DOI: https://doi.org/10.1007/s12036-014-9203-2

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