Physics of the central region in the quasar 0850+581

Details Physics of the central region in the quasar 0850+581 Physics of the central region in the quasar 0850+581

2008-10-13

arxiv.org/abs/0810.2240v1

Mem.S.A.It. 79 (2008) 1153-1156

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in Memorie della Societa Astronomica Italiana, Vol. 79

Scientific paper

The apparent position of the origin (core) of extragalactic radio jets shifts with the observing frequency, owing to synchrotron self-absorption and external absorption. One of the largest core shifts was detected by us in the quasar 0850+581 between 2 and 8 GHz. We have followed this up recently by a dedicated VLBA experiment at 5, 8, 15, 24, and 43 GHz. First results from this study enabled estimating the absolute geometry and physical conditions in the parsec-scale jet origin.

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