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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
AbstractWe 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.
KeywordPolarization Galaxies: Active Galaxies: Individual: M87 Galaxies: Jets Radio Continuum: General
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000208722200023
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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.
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