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IMAGES OF THE BL LACERTAE OBJECT 1749+701 AT 5 GHZ
Onsala Space Observatory, Onsala, Sweden.ORCID iD: 0000-0002-4826-019X
Shanghai Observatory, China.
1992 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 262, no 1, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents images of 1749+701 from data obtained between 1980 and 1983 as a part of our VLBI programme to monitor a subsample of BL Lac objects at 5GHz. Our images show that this source has a complex structure with a jet pointing towards the north-west at a position angle of about -65-degrees. The brightest component is growing in extension along this position angle. We suggest this to be the core and that the growing extension was caused by a shock generated during an outburst and moving out along the jet. From the extension rate, we obtain an angular separation speed of 0.18 mas yr-1, which corresponds to an apparent transverse speed of 5c. The distances and position angles of two outer components seem remarkably constant. The phenomenon can be understood through a model in which a relativistic jet bends such that its axis is very close to the line of sight in two points. We also deduce that the Lorentz factor must be 4.5 less-than-or-equal-to gamma less-than-or-equal-to 6.5 and that the viewing angle must be 5-degrees less-than-or-equal-to theta less-than-or-equal-to 10-degrees. In this paper, we also present two images obtained from 5GHz MERLIN and combined MERLIN-VLBI data respectively. These maps show that there is a weak component located at a distance of 0.42 arcsec from the core at p.a -155-degrees.

Place, publisher, year, edition, pages
Les Ulis, France: EDP Sciences, 1992. Vol. 262, no 1, 1-7 p.
Keyword [en]
BL LACERTAE OBJECTS, QUASARS, JETS, RADIO CONTINUUM
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22835ISI: A1992JK48200006OAI: oai:DiVA.org:hh-22835DiVA: diva2:629881
Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2015-02-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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