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Kinematics of quasars and AGN

Identifieur interne : 000796 ( Main/Corpus ); précédent : 000795; suivant : 000797

Kinematics of quasars and AGN

Auteurs : K. I Kellermann ; R. C Vermeulen ; J. A Zensus ; M. H Cohen ; A. West

Source :

RBID : ISTEX:A229CFBEEE61B5EBC7F9918FCB69A99E5FC53673

Abstract

The VLBA has been used over a period of four years to study the internal motions within a sample of quasars and AGN. In most sources, features appear to propagate away from the central engine along a well collimated radio jet with apparent transverse velocities between zero and 10c, with some evidence for apparent accelerations and decelerations. The distribution of apparent velocity is not consistent with any simple ballistic model and appears to require either a spread in intrinsic velocity or a difference between the bulk velocity and pattern velocity. The dependence of apparent angular velocity with redshift is consistent with standard Friedmann world models. Further observations of a larger source sample, especially at large redshift may lead to meaningful constraints on world models.

Url:
DOI: 10.1016/S1387-6473(99)00093-7

Links to Exploration step

ISTEX:A229CFBEEE61B5EBC7F9918FCB69A99E5FC53673

Le document en format XML

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<namePart type="given">A</namePart>
<namePart type="family">West</namePart>
<affiliation>NRAO1 The National Radio Astronomy Observatory is operated by Associated Universities, Inc., under cooperative Agreement with the National Science Foundation.1, Edgemont Rd., Charolottesville, VA 22903, USA</affiliation>
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<abstract lang="en">The VLBA has been used over a period of four years to study the internal motions within a sample of quasars and AGN. In most sources, features appear to propagate away from the central engine along a well collimated radio jet with apparent transverse velocities between zero and 10c, with some evidence for apparent accelerations and decelerations. The distribution of apparent velocity is not consistent with any simple ballistic model and appears to require either a spread in intrinsic velocity or a difference between the bulk velocity and pattern velocity. The dependence of apparent angular velocity with redshift is consistent with standard Friedmann world models. Further observations of a larger source sample, especially at large redshift may lead to meaningful constraints on world models.</abstract>
<note type="content">Fig. 1: Observed distribution of v/c for 72 sources with asymmetric structure and well determined velocity.</note>
<subject>
<genre>PACS</genre>
<topic>98.54.-h</topic>
<topic>98.54.Cm</topic>
<topic>98.70.Dk</topic>
</subject>
<subject>
<genre>Keywords</genre>
<topic>Galaxies: active</topic>
<topic>Galaxies: jets</topic>
<topic>Galaxies: kinematics</topic>
<topic>Galaxies: nuclei</topic>
<topic>Quasars: general</topic>
</subject>
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<titleInfo>
<title>New Astronomy Reviews</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>ASTREV</title>
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<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">199911</dateIssued>
</originInfo>
<identifier type="ISSN">1387-6473</identifier>
<identifier type="PII">S1387-6473(00)X0011-5</identifier>
<part>
<date>199911</date>
<detail type="volume">
<number>43</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>8–10</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>503</start>
<end>798</end>
</extent>
<extent unit="pages">
<start>757</start>
<end>760</end>
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</part>
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<identifier type="istex">A229CFBEEE61B5EBC7F9918FCB69A99E5FC53673</identifier>
<identifier type="DOI">10.1016/S1387-6473(99)00093-7</identifier>
<identifier type="PII">S1387-6473(99)00093-7</identifier>
<accessCondition type="use and reproduction" contentType="copyright">©1999 Elsevier Science B.V.</accessCondition>
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<recordOrigin>Elsevier Science B.V., ©1999</recordOrigin>
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