SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342

	SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342
	Wajima, Kiyoaki 1; Fujisawa, Kenta 2,3; Hayashida, Masaaki 4; Isobe, Naoki 5; Ishida, Takafumi 3; Yonekura, Yoshinori 6
刊名	ASTROPHYSICAL JOURNAL
	2014-02-01
卷号	781 期号:2 页码:1
关键词	galaxies: active galaxies: individual (1H 0323+342) galaxies: Seyfert radio continuum: galaxies techniques: interferometric
英文摘要	We made simultaneous single-dish and very long baseline interferometer (VLBI) observations of a narrow-line Seyfert 1 galaxy 1H 323+342, showing gamma-ray activity revealed by Fermi/Large Area Telescope observations. We found significant variation of the total flux density at 8 GHz on the timescale of one month by the single-dish monitoring. The total flux density varied by 5.5% in 32 days, which is comparable to the gamma-ray variability timescale, corresponding to the variability brightness temperature of 7.0 x 10(11) K. The source consists of central and southeastern components on the parsec (pc) scale. Only the flux of the central component decreased in the same way as the total flux density, indicating that the short-term radio variability, and probably the gamma-ray-emitting region, is associated with this component. From the VLBI observations, we obtained brightness temperatures of greater than (5.2 +/- 0.3) x 10(10) K and derived an equipartition Doppler factor of greater than 1.7, a variability Doppler factor of 2.2, and an 8 GHz radio power of 10(24.6) W Hz(-1). Combining them, we conclude that acceleration of radio jets and creation of high-energy particles are ongoing in the central engine and that the apparent very radio-loud feature of the source is due to the Doppler boosting effect, resulting in the intrinsic radio loudness being an order of magnitude smaller than the observed values. We also conclude that the pc-scale jet represents recurrent activity from the spectral fitting and the estimated kinematic age of pc- and kpc-scale extended components with different position angles.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; COMPACT STEEP-SPECTRUM ; ALL-SKY SURVEY ; STARBURST-AGN CONNECTION ; FREE-FREE ABSORPTION ; BLACK-HOLE MASS ; VLBI OBSERVATIONS ; 5 GHZ ; SOURCE CATALOG ; NORTHERN SKY
收录类别	SCI
语种	英语
WOS记录号	WOS:000331171200019
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18176]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Yamaguchi Univ, Res Inst Time Studies, Yamaguchi 7538511, Japan 3.Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi 7538512, Japan 4.Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan 5.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan 6.Ibaraki Univ, Ctr Astron, Mito, Ibaraki 3108512, Japan
推荐引用方式 GB/T 7714	Wajima, Kiyoaki,Fujisawa, Kenta,Hayashida, Masaaki,et al. SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342[J]. ASTROPHYSICAL JOURNAL,2014,781(2):1.
APA	Wajima, Kiyoaki,Fujisawa, Kenta,Hayashida, Masaaki,Isobe, Naoki,Ishida, Takafumi,&Yonekura, Yoshinori.(2014).SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342.ASTROPHYSICAL JOURNAL,781(2),1.
MLA	Wajima, Kiyoaki,et al."SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342".ASTROPHYSICAL JOURNAL 781.2(2014):1.