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

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

2008-11-18

arxiv.org/abs/0811.2926v1

Astronomy and Astrophysics

Astrophysics

3 pages, 3 figures, Proceedings of 10th Asian-Pacific Regional IAU Meeting 2008

Scientific paper

The upper envelope of the amplitude of the VLBI visibility function usually 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 n = -0.95 pm 0.37). The dependence is likely to result from synchrotron self-absorption in the inhomogeneous jet and not the free-free absorption (n = -2.5), nor the simple scatter broadening (n leq -2).

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