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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/039/03/0030

    • Keywords

       

      Galaxies; active; BLlacertae objects; general; BL lacertae objects; individual; PKS 0537–441.

    • Abstract

       

      We have reconsidered the simultaneous and homogeneous optical–IR light curves and the corresponding spectral indices curve of the blazarPKS0537–441 from January 2011 toMay2015. All the curves show significant fluctuations on various timescales, and the flux variations seem to be more pronounced towards the IR bands. The relation between average fluxes and spectral indices reveals the existence of redder-when-brighter (RWB) and bluer-when-brighter (BWB) trends at different flux levels, along with a long-term achromatic trend and a mild RWB trend on short-term timescales. Cross-correlation analyses present an energy-dependent time delay that the lower-frequency variations follow higher-frequency ones by a few weeks and a hysteresis pattern between spectra and fluxes. Our analysis reveals some potential coherence between low-energy-peaked BL Lacs (LBLs) and FSRQs, and indicates that the observed flux variability and spectral changes could be due to the superposition of a dominant jet emission, an underlying thermal contribution from a more slowly varyingdisk and/or other geometric effects under the shock-in-jet scenario.

    • Author Affiliations

       

      XIAO-PAN LI1 LI-SHA WANG1 CHENG YANG2 HAI-YAN YANG1 LI ZHOU1 GUANG-YANG XU1 YU-QIONG SHAN1 JIE LIU1 YU-HUI LUO1 LI ZHANG3 4

      1. Department of Physics, Zhaotong University, Zhaotong 657000, China.
      2. College of Optoelectronic and Communication Engineering, Yunnan Open University, Kunming 650223, China.
      3. School of Foreign Language, Xiamen University, Xiamen 361005, China.
      4. School of Foreign Language, Zhaotong University, Zhaotong 657000, China.

    • Dates

       
      Published
      28 June 2018
      Manuscript received
      17 November 2017
      Accepted
      2 March 2018
      Final version published online
      20 April 2018

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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