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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/035/03/0247-0251

    • Keywords

       

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

    • Abstract

       

      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.

    • Author Affiliations

       

      Jun Liu1 2 3 Lang Cui1 2 Xiang Liu1 2 Zhen Ding1 2 Hua-Gang Song1 2

      1. Xinjiang Astronomical Observatory, CAS, 150 Science 1-Street, Urumqi 830011, China.
      2. Key Laboratory of Radio Astronomy, CAS, Nanjing 210008, China.
      3. University of Chinese Academy of Sciences, Beijing 10049, China.
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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