VLBI Observations of Mkn 501 and Mkn 421

Details VLBI Observations of Mkn 501 and Mkn 421 VLBI Observations of Mkn 501 and Mkn 421

1998-10-27

arxiv.org/abs/astro-ph/9810430v1

Astronomy and Astrophysics

Astrophysics

to appear in the Proceedings of the "Bl Lac Phenomenon" Conference, held in Turku, 1998 - June 22,26 - ed. Leo Takalo

Scientific paper

We present here two epochs of Space VLBI observations at 18 cm of the BL-Lac type object Mkn 501. Thanks to the high resolution of these new data we have found that the inner jet is centrally brightened at its beginning but becomes extended and limb brightened at ~ 8 mas from the core. Moreover a comparison between the two epochs shows the presence of a possible proper motion with apparent velocity = 6.7c. VLBI data at 6 and 18 cm of the BL-Lac type object Mkn 421 are also presented. Observational data have been used to constrain the jet velocity and orientation.

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