Japanese VLBI Network Observations of a Gamma-Ray Narrow-Line Seyfert 1 Galaxy 1H 0323+342

被引：0
|
作者：
Kiyoaki Wajima
Kenta Fujisawa
Masaaki Hayashida
Naoki Isobe
机构：
[1] Chinese Academy of Sciences,Shanghai Astronomical Observatory
[2] Yamaguchi University,Research Institute for Time Studies
[3] The University of Tokyo,Institute for Cosmic Ray Research
[4] Japan Aerospace Exploration Agency,The Institute of Space and Astronautical Science
来源：
Journal of Astrophysics and Astronomy | 2014年 / 35卷
关键词：
Galaxies: active—galaxies: individual (1H 0323+342)—galaxies: Seyfert—radio continuum: galaxies.;
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摘要：
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.
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页码：215 / 218
页数：3
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