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Astron. Astrophys. 333, 13-16 (1998)

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Localised neutral hydrogen absorption towards the radio jet of Markarian 6

J.F. Gallimore 1, A.J. Holloway 2, A. Pedlar 3 and C.G. Mundell 3

1 Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, D-85740 Garching b. München, Germany
(e-mail: jfg@hethp.mpe-garching.mpg.de)
2 Department of Physics and Astronomy, University of Manchester, Schuster Laboratory, Oxford Road, Manchester M13 9PL, UK
3 Nuffield Radio Astronomy Laboratories, University of Manchester, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, UK

Received 12 September 1997 / Accepted 10 November 1997

Abstract

We present [FORMULA] (56 pc) resolution MERLIN observations of neutral hydrogen (H I) [FORMULA] 21 cm absorption detected towards the arcsecond-scale radio jet of the Seyfert 1.5 galaxy Markarian 6. Absorption is detected only towards a bright, compact radio feature located, in projection, [FORMULA]  pc north of the likely location of the optical nucleus. Based on comparison with an archival HST image, we propose a geometry in which the H I absorption arises in a dust lane passing north of, but not covering, the optical nucleus, and the southern lobe of the jet is oriented on the near side of the inclined galaxian disk. We note that this result is contrary to previous models which place the extended narrow-line region on the near side of the disc.

Key words: galaxies: active – galaxies: jets – galaxies: kinematics and dynamics – galaxies: Seyfert – galaxies: individual: Markarian 6

Send offprint requests to: J.F. Gallimore

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© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998
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