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Fast jet proper motion discovered in a blazar at z=4.72
Zhang, Yingkang1,2; An, Tao1,3; Frey, Sandor4
2020-04-15
Source PublicationSCIENCE BULLETIN
ISSN2095-9273
Volume65Issue:7Pages:525-530
Corresponding AuthorAn, Tao(antao@shao.ac.cn)
AbstractHigh-resolution observations of high-redshift (z > 4) radio quasars offer a unique insight into jet kinematics at early cosmological epochs, as well as constraints on cosmological model parameters. Due to the general weakness of extremely distant objects and the apparently slow structural changes caused by cosmological time dilation, only a couple of high-redshift quasars (HRQs) have been studied with parsec-scale resolutions, and with limited number of observing epochs. Here we report on very long baseline interferometry (VLBI) observations of a high-redshift blazar J1430 + 4204 (z = 4.72) in the 8 GHz frequency band at five different epochs spanning 22 years. The source shows a compact core-jet structure with two jet components being identified within 3 milli-arcsecond (mas) scale. The long time span and multiple-epoch data allow for the kinematic studies of the jet components. That results in a jet proper motion of mu(J1) = 0.017 +/- 0.002 mas a(-1) and mu(J2) = 0.156 +/- 0.015 mas a(-1), respectively. For the fastest-moving outer jet component J2, the corresponding apparent transverse speed is (19.5 +/- 1.9) c. The inferred bulk jet Lorentz factor Gamma = 14.6 +/- 3.8 and viewing angle theta = 2.2 degrees +/- 1.6 degrees indicate highly relativistic beaming. The Lorentz factor and apparent proper motion are the highest measured to date among the z > 4 jetted radio sources, while the jet kinematics is still consistent with the cosmological interpretation of quasar redshifts. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
KeywordNuclei High-redshift Radio continuum Quasars Individual J1430+4204
DOI10.1016/j.scib.2020.01.008
WOS KeywordACTIVE GALACTIC NUCLEI ; SIZE REDSHIFT RELATION ; BLACK-HOLE ; RADIO ; QUASARS ; KINEMATICS ; POLARIMETRY
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000521734100005
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35902
Collection中国科学院紫金山天文台
Corresponding AuthorAn, Tao
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
4.Konkoly Observ Budapest, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
Recommended Citation
GB/T 7714
Zhang, Yingkang,An, Tao,Frey, Sandor. Fast jet proper motion discovered in a blazar at z=4.72[J]. SCIENCE BULLETIN,2020,65(7):525-530.
APA Zhang, Yingkang,An, Tao,&Frey, Sandor.(2020).Fast jet proper motion discovered in a blazar at z=4.72.SCIENCE BULLETIN,65(7),525-530.
MLA Zhang, Yingkang,et al."Fast jet proper motion discovered in a blazar at z=4.72".SCIENCE BULLETIN 65.7(2020):525-530.
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