Fast jet proper motion discovered in a blazar at z=4.72
Zhang, Yingkang1,2; An, Tao1,3; Frey, Sandor4
Source PublicationSCIENCE BULLETIN
Corresponding AuthorAn, Tao(
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
Indexed BySCI
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000521734100005
Citation statistics
Document Type期刊论文
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Yingkang]'s Articles
[An, Tao]'s Articles
[Frey, Sandor]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Yingkang]'s Articles
[An, Tao]'s Articles
[Frey, Sandor]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Yingkang]'s Articles
[An, Tao]'s Articles
[Frey, Sandor]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.