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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 125442.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Jet collimation in action : realignment on kiloparsec scales in 3C 279
Authors:Homan, D. C.; Lister, M. L.; Kellermann, K. I.; Cohen, M. H.; Ros, E.; Zensus, J. A.; Kadler, M.; Vermeulen, R. C.
Language:English
Date of Publication (YYYY-MM-DD):2003-05-20
Title of Journal:Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Volume:589
Issue / Number:1
Start Page:L9
End Page:L12
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report a change in the trajectory of a well-studied jet component of the quasar 3C 279. The component changes in apparent projected speed and direction, and we find it to be moving with a Lorentz factor gamma greater than or similar to 15 at an initial angle of less than or similar to1degrees to the line of sight. The new trajectory of the component has approximately the same speed and direction as an earlier superluminal feature, originally seen in the early 1970s. The new direction for the component is also much better aligned with larger scale Very Large Baseline Array and Very Large Array structure out to 0."1. We suggest that the trajectory change is a collimation event occurring at greater than or similar to1 kpc (deprojected) along the jet. While the change in trajectory on the sky appears to be 26degrees, the intrinsic change is less than or similar to1degrees. We estimate the Doppler factor prior to the change in direction to be delta greater than or similar to 28 and after the change to be delta greater than or similar to 23. A comparison with independent constraints on the Doppler factor suggests that the energy in the radiating particles cannot greatly exceed the energy in the magnetic field unless the volume filling factor is very much less than 1.
Free Keywords:galaxies : active, galaxies : jets, galaxies : kinematics and dynamics, quasars : individual (3C 279)
Comment of the Author/Creator:Date: 2003, MAY 20
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Natl Radio Astron Observ, Charlottesville, VA 22903 USA.; CALTECH, Dept Astron, Pasadena, CA 91125 USA.; Max Planck Inst Radioastron, D-53121 Bonn, Germany.; Netherlands Fdn Res Astron, NL-7990 AA Dwingeloo, Netherlands.
Identifiers:ISI:000182943900003 [ID No:1]
ISSN:0004-637X [ID No:2]
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