IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ

	IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ
	BAATH, LB; ZHANG, FJ
刊名	ASTRONOMY & ASTROPHYSICS
	1992-08-01
卷号	262 期号:1 页码:1-7
关键词	BL LACERTAE OBJECTS QUASARS RADIO CONTINUUM JETS
英文摘要	This paper presents images of 1749+701 from data obtained between 1980 and 1983 as a part of our VLBI programme to monitor a subsample of BL Lac objects at 5GHz. Our images show that this source has a complex structure with a jet pointing towards the north-west at a position angle of about -65-degrees. The brightest component is growing in extension along this position angle. We suggest this to be the core and that the growing extension was caused by a shock generated during an outburst and moving out along the jet. From the extension rate, we obtain an angular separation speed of 0.18 mas yr-1, which corresponds to an apparent transverse speed of 5c. The distances and position angles of two outer components seem remarkably constant. The phenomenon can be understood through a model in which a relativistic jet bends such that its axis is very close to the line of sight in two points. We also deduce that the Lorentz factor must be 4.5 less-than-or-equal-to gamma less-than-or-equal-to 6.5 and that the viewing angle must be 5-degrees less-than-or-equal-to theta less-than-or-equal-to 10-degrees.
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 ; COMPACT NONTHERMAL SOURCES ; ACTIVE GALACTIC NUCLEI ; COMPLETE SAMPLE ; SUPERLUMINAL MOTION ; FINE-STRUCTURE ; S5 SURVEY ; POLARIZATION ; PHYSICS ; MODELS
收录类别	SCI
语种	英语
WOS记录号	WOS:A1992JK48200006
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19316]
专题	上海天文台_VLBI研究室
作者单位	CHINESE ACAD SCI, SHANGHAI OBSERV, SHANGHAI, PEOPLES R CHINA
推荐引用方式 GB/T 7714	BAATH, LB,ZHANG, FJ. IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ[J]. ASTRONOMY & ASTROPHYSICS,1992,262(1):1-7.
APA	BAATH, LB,&ZHANG, FJ.(1992).IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ.ASTRONOMY & ASTROPHYSICS,262(1),1-7.
MLA	BAATH, LB,et al."IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ".ASTRONOMY & ASTROPHYSICS 262.1(1992):1-7.