The Apparent Angular Size - Frequency Dependence in ～3000 Parsec-scale Extragalactic Jets

摘要：

The upper envelope of the amplitude of the VLBI visibility function usu ally represents the most compact structural pattern of extragalactic radio sources, in particular, the core-jet morphologies. By fitting the envelope to a circular Gaussian model in ～3000 parsec-scale core-jet structures, we find that the apparent angular size shows significant power-law dependence on the observing frequency (power index η = -0.95±0.37). The dependence is likely to result from synchrotron self-absorption in the inhomogeneous jet and not the free-free absorption (η = 2.5), nor the simple 8catter broadening (η≤ -2).

关键词： galaxies active galaxies jets radio continuum galaxies

作者: J. Yang Li Gurvits S. Frey A.P. Lobanov

作者单位: Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, P.R Joint Institute for VLBI in Europe, PO Box 2, 7990 AA Dwingeloo, The Netherlands FOMI Satellite Geodetic Observatory, PO Box 585, 1592 Budapest, Hungary MTA Research Group for Phys Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

会议类型: 国际会议

会议名称: The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)

会议地点: 昆明

会议语种:英文

页码: 270-272

在线出版日期: 2008-08-03（万方平台首次上网日期，不代表论文的发表时间）