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The radio fine structure of the BL Lacertae object Mk 421
Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0002-4826-019X
1990 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 236, no 1, p. 47-52Article in journal (Refereed) Published
Abstract [en]

The BL Lac object Markarian 421 (Mk 421) has been mapped using VLBI arrays at a wavelength of 6 cm on four epochs from 1980.41 to 1983.43. It has a core-jet like structure with the jet pointing to the direction of NW with a stable position angle of about -45 deg. Almost all of the flux variation is accounted for by the change of the peak flux density of a compact component in the core. The results show that Mk 421 may exhibit apparent superluminal motion with apparent transverse speeds of components of (1.92 + or - 0.03)c (from 1981.25 to 1981.94) and (1.79 + or - 0.23)c (from 1981.94 to 1983.43) for C1; and (1.36 + or - 0.22)c for C2. The position angles of both the components C1 and C2 are nearly the same as the position angle of the jet, and there is no significant change of position angle as they move away from the core.

Place, publisher, year, edition, pages
Les Ulis: EDP Sciences, 1990. Vol. 236, no 1, p. 47-52
Keywords [en]
BL Lacertae objects, galaxies: jets of, galaxies: structure of, radio sources: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22815ISI: A1990DW13600010OAI: oai:DiVA.org:hh-22815DiVA, id: diva2:629867
Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2017-12-06Bibliographically approved

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