The radio structure of BL Lac object S5 2007+777

	The radio structure of BL Lac object S5 2007+777
	Wu ZhongZu 1,3; Gu MinFeng2 ; Chen YongJun2
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2010
卷号	53 期号:1 页码:187-190
关键词	active galactic nuclei VLBI BL Lac objects
英文摘要	BL Lac object S5 2007+777 has been classified as a HYMOR (Hybrid Morphology radio source) for its hybrid FR I and FR II radio morphology. It is one of four BL Lac objects with a kpc scale extended X-ray jet. In this paper, we searched the unpublished European VLBI Network (EVN) archived high resolution data for this source, and present the high resolution radio structure. The EVN images all show a core-jet structure in 1.6, 5 and 8 GHz. In combination with the VLA data in the literature, we found position angle differences (Delta PA) of about 10 degrees-20 degrees between pc and kpc scale jet structures. The brightness temperature estimated from multi-band EVN images are around 10(11.2)-10(11.8) K, from which the Doppler factor ranges from 3.2 to 12.0. We found significant flux variations of the radio core in 1.6 and 5 GHz, from which we derived the variability in brightness temperature T(var) to be 10(13.6) K and 10(14.0) K, corresponding to the Doppler factors of 9.3 and 12.4, respectively.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; LACERTAE OBJECTS ; VLBI OBSERVATIONS ; COMPLETE SAMPLE ; LORENTZ FACTORS ; VIEWING ANGLES ; GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000280291800043
公开日期	2011-06-29
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/13389]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Guizhou Univ, Coll Sci, Guiyang 550025, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Guizhou Univ, NAOC GZU Sponsored Ctr Astron, Guiyang 550025, Peoples R China
推荐引用方式 GB/T 7714	Wu ZhongZu,Gu MinFeng,Chen YongJun. The radio structure of BL Lac object S5 2007+777[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53(1):187-190.
APA	Wu ZhongZu,Gu MinFeng,&Chen YongJun.(2010).The radio structure of BL Lac object S5 2007+777.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53(1),187-190.
MLA	Wu ZhongZu,et al."The radio structure of BL Lac object S5 2007+777".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53.1(2010):187-190.