NAOC Open IR
Spectral Reversal and Stratification of the Jet in 3C 273
T R Krichbaum1; Qian Shanjie2; Zhang Xizhen2; J A Zensus1; A Kraus1; A Witzel1
2001
Source PublicationChinese Journal of Astronomy and Astrophysics
ISSN1009-9271
Volume1Issue:4Pages:296
AbstractQuasi-simultaneous VLBI observations at 15-86 GHz have shown that in the classical superluminal radio source 3C 273, the spectral index a (S-nu alpha nu (alpha)) has a systematic variation along the jet. For epoch 1995.15, a spectral reversal was observed at core distance similar to1.5 mas, where the superluminal knot C12 located. Similarly, for epoch 1997.18, two spectral reversals were observed at core distances of similar to1.8 mas and similar to4.2 mas, where superluminal knots C11 and C14 were, respectively. These spectral reversals are associated with local maxima of the jet width. We suggest that this phenomenon may be related to a stratification of the jet structure, i.e., its physical parameters (flow velocity, Doppler factor, electron density and energy, magnetic field strength, etc.) are substantially dependent on the distance from the jet axis. These properties may be naturally formed through gasdynamic processes when the jet expands into a lower pressure ambient medium.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/53428
Collection中国科学院国家天文台
Affiliation1.Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
T R Krichbaum,Qian Shanjie,Zhang Xizhen,et al. Spectral Reversal and Stratification of the Jet in 3C 273[J]. Chinese Journal of Astronomy and Astrophysics,2001,1(4):296.
APA T R Krichbaum,Qian Shanjie,Zhang Xizhen,J A Zensus,A Kraus,&A Witzel.(2001).Spectral Reversal and Stratification of the Jet in 3C 273.Chinese Journal of Astronomy and Astrophysics,1(4),296.
MLA T R Krichbaum,et al."Spectral Reversal and Stratification of the Jet in 3C 273".Chinese Journal of Astronomy and Astrophysics 1.4(2001):296.
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