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Multifrequency VLBA polarimetry of the high-redshift GPS quasar OQ172
Liu, Yi; Jiang, D. R.; Gu, Minfeng; Gurvits, L. I.
2017
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号468期号:3页码:2699-2712
摘要Multifrequency Very Long Baseline Array (VLBA) polarimetry observation of the GHz-peaked spectrum (GPS) quasar OQ172 (J1445+ 0958) has been performed at 1.6, 2.2, 4.8, 8.3 and 15.3 GHz in 2005. Core-jet structures are detected in all bands with the jet strongly bent at about 3 mas from the core. The radio emission of the source is polarized at all five bands. We study the Faraday rotation in the core and jet components at all five bands, and find good linear fits of Faraday rotation in the core and jet components at 4.8 and 8.3 GHz. At these two frequencies, the rotation measure (RM) is similar to 2000 rad m(-2) in the core and similar to 700 rad m(-2) in the inner jet components and continues to decrease at the outer jet parts. We find that the depolarization at 4.8 and 8.3 GHz might be caused by the internal medium in the source. We investigate consistency of the turnover spectra of VLBI components with the synchrotron self-absorption and free-free absorption models. Although these two models cannot be easily distinguished due to the lack of low-frequency data, the physical parameters can be constrained for each model. We find that the large width of the [O III](5007) line is likely caused by a jet interaction with a narrow line region (NLR) medium. The jet bending, significant RM variations, Faraday depolarization, spectral turnover and broad line width of [O III](5007) could be closely related, likely caused by the same nucleus medium, presumably NLR.
语种英语
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17369
专题分子云与恒星形成研究团组
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Liu, Yi,Jiang, D. R.,Gu, Minfeng,et al. Multifrequency VLBA polarimetry of the high-redshift GPS quasar OQ172[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,468(3):2699-2712.
APA Liu, Yi,Jiang, D. R.,Gu, Minfeng,&Gurvits, L. I..(2017).Multifrequency VLBA polarimetry of the high-redshift GPS quasar OQ172.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,468(3),2699-2712.
MLA Liu, Yi,et al."Multifrequency VLBA polarimetry of the high-redshift GPS quasar OQ172".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 468.3(2017):2699-2712.
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