Japanese VLBI Network Observations of a Gamma-Ray Narrow-Line Seyfert 1 Galaxy 1H 0323+342期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	Email author" target="_blank">Kiyoaki?Wajima Email author Kenta?Fujisawa Masaaki?Hayashida Naoki?Isobe

Institution:	1.Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai,China;2.Research Institute for Time Studies,Yamaguchi University,Yamaguchi,Japan;3.Institute for Cosmic Ray Research,The University of Tokyo,Chiba,Japan;4.The Institute of Space and Astronautical Science,Japan Aerospace Exploration Agency,Sagamihara,Japan

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.

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