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Periodic Variations of the Jet Flow Lorentz Factor in 3C 273
Zhang Xizhen1; U Lisenfeld2; T P Krichbaum3; A Witzel3; S Britzen4; J A Zensus3; H Ungerechts2; Qian Shanjie1; A Kraus3
2001
Source PublicationChinese Journal of Astronomy and Astrophysics
ISSN1009-9271
Volume1Issue:3Pages:236
Abstract3C 273 has been observed with VLBI for more than 30 years. The entire data have shown that the position angle of the superluminal knots ejected from the core varies periodically with a period of similar to 15 years. Moreover, their apparent velocity observed during the period 1963 - 1997 has systematically decreased by a factor of greater than or equal to 2. These remarkable properties are explained in terms of a precessing jet model, in which the ejection Lorentz factor of the superluminal knots has been decreasing during the last thirty years and has superposed on it a short-term (similar to5 year) oscillation. The periodic variations derived by the model-fitting are compared with the variations in the optical flux density. Binary black hole models are briefly discussed to show possible relations of the observed periods to the periods involved in a binary system (orbital motion, spin of black hole, accretion-disk rotation and Newtonian-driven precession etc.).
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/51098
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.Instituto Radioastronomia Milim■trica , Avenida Divina Pastora 7, N■cleo Central, E-18012 Granada
3.德国马普学会射电天文学研究所
4.Netherlands Foundation for Research in Astronomy, P.O. Box 2, 7990 AA Dwingeloo,
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Xizhen,U Lisenfeld,T P Krichbaum,et al. Periodic Variations of the Jet Flow Lorentz Factor in 3C 273[J]. Chinese Journal of Astronomy and Astrophysics,2001,1(3):236.
APA Zhang Xizhen.,U Lisenfeld.,T P Krichbaum.,A Witzel.,S Britzen.,...&A Kraus.(2001).Periodic Variations of the Jet Flow Lorentz Factor in 3C 273.Chinese Journal of Astronomy and Astrophysics,1(3),236.
MLA Zhang Xizhen,et al."Periodic Variations of the Jet Flow Lorentz Factor in 3C 273".Chinese Journal of Astronomy and Astrophysics 1.3(2001):236.
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