ShanJie Qian1; T P Krichbaum2; S Britzen2; XiZhen Zhang1; A Witzel2; J A Zensus2
Source Publicationresearchinastronomyandastrophysics
AbstractThe search for periodic behavior in Blazars has been an important subject, which is helpful for providing significant clues to the structure and physical processes of their central energy engine. A binary black hole system has recently been suggested for causing precession of relativistic jets and rotation of the ejection position angle of VLBI knots in superluminal sources. It has been suggested that in QSO 3C345, the ejection direction of the superluminal knots rotates due to the precession of the central engine and thus the ejection position angle of the successive knots shows a periodic behavior. Some authors argue for a period of precession being similar to 5.6 yr (Abraham & Caproni), similar to 8-10 yr (Klare et al.) and similar to 9.5 yr (Lobanov & Roland). Applying the helical model proposed by Qian et al. and selecting appropriate parameters to fit the initial trajectories (within 0.3 mas) of all the components (C4 to C 10), we derive the relation between the ejection position angle of the components and their precession phase, and thus find a 6.9-year precession period (4.3 yr in the source frame), which can fit the ejection position angle of all these superluminal knots well. Since the VLBI observations have covered more than two precession periods, confirmation in one or more future periods would be important. In addition, we emphasize that the initial parts of the trajectories of these knots can be fitted by a common helical pattern (channel) through a precessing of its initial phase. This scenario (or helical precessing model) is different from the usual ballistic precessing model in which the individual superluminal knots move along straight-lines after ejection (Tateyama & Kingham).
Funding Project[Max-Planck-Institut fur Radioastronomie (Germany)]
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
ShanJie Qian,T P Krichbaum,S Britzen,et al. periodicityoftheejectionofsuperluminalcomponentsin3c345[J]. researchinastronomyandastrophysics,2009,9(2):137.
APA ShanJie Qian,T P Krichbaum,S Britzen,XiZhen Zhang,A Witzel,&J A Zensus.(2009).periodicityoftheejectionofsuperluminalcomponentsin3c345.researchinastronomyandastrophysics,9(2),137.
MLA ShanJie Qian,et al."periodicityoftheejectionofsuperluminalcomponentsin3c345".researchinastronomyandastrophysics 9.2(2009):137.
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