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The Two-Sided VLBI Source in the Seyfert Galaxy Mrk 231

Published online by Cambridge University Press:  12 April 2016

J. S. Ulvestad ,
J. M. Wrobel  and
C. L. Carilli
J. S. Ulvestad
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA
J. M. Wrobel
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA
C. L. Carilli
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA

Abstract

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The Seyfert 1/starburst/IR galaxy Mrk 231 (UGC 08058), at z = 0.0422, has been imaged with the VLBA at frequencies ranging from 1.4 GHz to 22 GHz. The radio image shows a triple source of total size 50 mas (30h−1 pc), with a self-absorbed central component and two detached lobes. The northern lobe, located 12h−1 pc from the core, is free-free absorbed at the lowest frequencies; there also seems to be free-free absorption in the southern component. The linear scale over which this absorption takes place is several times larger than that seen in NGC1275/3C84.

The axis of the 50-mas radio source is approximately 60° from the elongation of the central component on the 1-mas scale. The spectrum of this central component becomes optically thin between 5 and 8.4 GHz, and resolves into a small triple source of size ~ 1.0h−1 pc at 15 GHz. There is no hint of a jet or other structure directly connecting this central component to the outer VLBI lobes.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 199 - 200
Copyright
Copyright © Astronomical Society of the Pacific 1998

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