The two mini-lobes of the CSOOQ208 - VLBI observations at 5 GHz and 8.4 GHz

	The two mini-lobes of the CSOOQ208 - VLBI observations at 5 GHz and 8.4 GHz
	Wang, WH ; Hong, XY ; An, T
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2003-12-01
卷号	3 期号:6 页码:505-512
关键词	galaxies : individual (Mkn 668 OQ208) galaxies : active
英文摘要	We present the results of VLBI observations at 5 GHz and 8.4 GHz of the compact symmetric object (CSO) OQ208. Images taken on four epochs at 5 GHz and one at 8.4 GHz show that the parsec radio structure of the source consists of two mini-lobes, both of them are resolved into two hot-spots. We note that the component D is stronger than the component C in the south-west region at 5 GHz, indicating that component D is less free-free absorbed than C at low frequency. On the basis of the separation of components A and D, a proper motion of 0.032 +/- 0.02 mas yr(-1) between the two mini-lobes is estimated. This value is about half the previous estimates based on the separation of components A and C with 8.4 GHz VLBI data. The reason for the decrease in the expansion velocity is discussed.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SPECTRUM RADIO-SOURCES ; IMAGES ; OQ-208 ; SAMPLE ; YOUNG ; AGE ; CM
收录类别	SCI
语种	英语
WOS记录号	WOS:000187404500004
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18289]
专题	上海天文台_VLBI研究室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Wang, WH,Hong, XY,An, T. The two mini-lobes of the CSOOQ208 - VLBI observations at 5 GHz and 8.4 GHz[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2003,3(6):505-512.
APA	Wang, WH,Hong, XY,&An, T.(2003).The two mini-lobes of the CSOOQ208 - VLBI observations at 5 GHz and 8.4 GHz.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,3(6),505-512.
MLA	Wang, WH,et al."The two mini-lobes of the CSOOQ208 - VLBI observations at 5 GHz and 8.4 GHz".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 3.6(2003):505-512.