• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Galaxies: active; galaxies: individual (1H 0323+342); galaxies: Seyfert; radio continuum: galaxies.

    • Abstract


      We made simultaneous single-dish and VLBI observations of a gamma-ray narrow-line Seyfert 1 (NLS1) galaxy 1H 0323+342. We found significant flux variation at 8 GHz on a time scale of one month. The total flux density varied by 5.5% in 32 days, corresponding to a variability brightness temperature of 7.0 × 1011 K. We also obtained brightness temperatures of greater than 5.2 × 1010 K from the VLBI images. These high brightness temperatures suggest that the source has nonthermal processes in the central engine. The source structure could be modelled by two elliptical Gaussian components on the parsec scales. The flux of the central component decreases in the same way as the total flux density, showing that the short-term variability is mainly associated with this component.

    • Author Affiliations


      Kiyoaki Wajima1 Kenta Fujisawa2 Masaaki Hayashida3 Naoki Isobe4

      1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China.
      2. Research Institute for Time Studies, Yamaguchi University, Yamaguchi 753-8511, Japan.
      3. Institute for Cosmic Ray Research, The University of Tokyo, Chiba 277-8582, Japan.
      4. The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan.
    • Dates

  • 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

© 2017-2019 Indian Academy of Sciences, Bengaluru.