The core-like nature of HST-1 in the M87 jet

	The core-like nature of HST-1 in the M87 jet
	Chen, Y. J.1,2; Zhao, G. -Y.1,3; Shen, Z. -Q.1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2011-09-01
卷号	416 期号:1 页码:L109-L113
关键词	polarization galaxies: active galaxies: individual: M87 galaxies: jets radio continuum: general
英文摘要	We investigate the total flux density, spectral, polarization and Faraday rotation variability of HST-1 in the M87 jet during the outburst from 2003 to 2007 through multi-epoch Very Large Array observations at 8, 15 and 22 GHz. Contrary to the general case for blazars, the flux densities of HST-1 rise earlier at lower frequencies from radio to X-ray, and the spectra are softening with the growth of outburst, indicating that the newly emerging subcomponents within HST-1 have relatively steep spectra. In particular, the intrinsic optical electric vector positional angle varies monotonically by similar to 90 degrees. at the three wavebands during the period, and all but the stationary subcomponent in the eastern end of HST-1 move downstream superluminally deviating divergently from the overall jet direction, with the motion of the outmost subcomponent bending from one side of the jet axis to another. These strongly argue for the presence of helical magnetic fields around HST-1, which is also supported by the fact that the subcomponents might be accelerated in this region. The fractional polarization is relatively low in the rising stage, and in the decaying stage the polarization levels are almost comparable at the three wavebands. In view of the quite large rotation measure (RM) values, Faraday rotation is expected to occur dominantly external to HST-1 in the decaying stage, which is well supported by the presence of diffuse emission around HST-1, and consistent with the scenario that RM decrease gets slower with time.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000208722200023
公开日期	2015-01-29
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15478]
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, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Chen, Y. J.,Zhao, G. -Y.,Shen, Z. -Q.. The core-like nature of HST-1 in the M87 jet[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,416(1):L109-L113.
APA	Chen, Y. J.,Zhao, G. -Y.,&Shen, Z. -Q..(2011).The core-like nature of HST-1 in the M87 jet.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,416(1),L109-L113.
MLA	Chen, Y. J.,et al."The core-like nature of HST-1 in the M87 jet".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 416.1(2011):L109-L113.