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Viewing angles in some selected BL Lac objects
Shanghai Observatory, Chinese Academy of Sciences, Shanghai 200030, China.
Halmstad University, School of Business and Engineering (SET).ORCID iD: 0000-0002-4826-019X
1996 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 235, no 2, 195-205 p.Article in journal (Refereed) Published
Abstract [en]

A selected subset of BL Lac objects were monitored with VLBI techniques at multifrequencies. Apparent superlumJnal motion and X-rays were detected in all of the monitored sources. From the observational data, kinematic parameters, geometric parameters and beaming effects for the 'core' of the selected BL Lac objects have been estimated. Our results indicate that some BL Lacs have large Lorentz factors and small viewing angles; relativistic beaming effects are strongly present in these sources. On the other hand, some BL Lacs have small Lorentz thctors; their viewing angles are quite large. It does not seem possible to avoid the fact that some BL Lac objects are not oriented particularly close to the line of sight. It conflicts with the basic assumption of the accepted theories for explaining the characteristics of BL Lac objects at present. Also, it seems that the BL Lac objects in the class I of the Burdige and Hewitt's classification have larger viewing angles than those int he class II. The whole BL Lac classification could be a misnomer: the sources classified as 'BL Lac objects' are a mixture of physically different populations with different parent objects.

Place, publisher, year, edition, pages
Springer, 1996. Vol. 235, no 2, 195-205 p.
Keyword [en]
BL Lac objects, VLBI techniques
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-1873DOI: 10.1007/BF00644440ISI: A1996UT79700003Scopus ID: 2-s2.0-0040456973Local ID: 2082/2268OAI: oai:DiVA.org:hh-1873DiVA: diva2:239091
Available from: 2008-09-10 Created: 2008-09-10 Last updated: 2013-11-15Bibliographically approved

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Bååth, Lars B.
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf