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Jet–Cloud Interactions in Compact Steep Spectrum Radio Sources

Published online by Cambridge University Press:  05 March 2013

C. P. O'Dea ,
W. H. de Vries ,
A. M. Koekemoer ,
S. A. Baum ,
D. J. Axon ,
P. D. Barthel ,
A. Capetti ,
R. Fanti ,
R. Gelderman  and
R. Morganti
...Show all authors
C. P. O'Dea
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. [email protected], [email protected], [email protected]
W. H. de Vries
Affiliation:
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550-9234, USA. [email protected]
A. M. Koekemoer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. [email protected], [email protected], [email protected]
S. A. Baum
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. [email protected], [email protected], [email protected]
D. J. Axon
Affiliation:
University of Hertfordshire, College Lane, Hatfield Herts, AL10 9AB, UK. [email protected]
P. D. Barthel
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands. [email protected]
A. Capetti
Affiliation:
Osservatorio Astronomico di Torino, Via Osservatorio 20, I-10025, Pino Torinesse (TO), Italy. [email protected]
R. Fanti
Affiliation:
Instituto di Radioastronomia del CNR, Via P. Gobetti, 101, I-40129, Bologna, Italy. [email protected]
R. Gelderman
Affiliation:
Western Kentucky University, 1 Big Red Way, Bowling Green, KY 42101-3576, USA. [email protected]
R. Morganti
Affiliation:
Netherlands Foundation for Astronomy, PO Box 2, 7990 AA Dwingeloo, The Netherlands. [email protected]
C. N. Tadhunter
Affiliation:
University of Sheffield, Western Bank, Sheffield, S10 2TN, UK. [email protected]
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Abstract

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We have obtained HST/STIS long slit spectroscopy of the aligned emission line nebulae in three compact steep spectrum (CSS) radio sources — 3C 67, 3C 277.1, and 3C 303.1. We find systematic offsets (˜300–500 kms) of the emission line velocities on one or both sides of the radio sources. We also see evidence for broad lines (FWHM ˜500 kms) and complex emission line profiles. In 3C 303.1 the data are consistent with multiple components and possibly split lines. The amplitude of the velocity variations is not so large as to exclude gravitationally-induced motions. However, the complex kinematics, the lack of a signature of Keplerian rotation, and the association of the velocity variations with the radio lobes are consistent with the observed ˜300–500 kms velocities being driven by the expansion of the radio source. Acceleration of the clouds by the bow shock is plausible given the estimated densities in the clouds and the velocities observed in the much smaller compact symmetric objects and with expansion velocities estimated from spectral ageing. This conclusion is unchanged if we consider the scenario in which the cloud acceleration is dominated by the post bow shock flow.

Keywords

galaxies: activegalaxies: jetsgalaxies: individual (3C 67, 3C 277.1, 3C 303.1)
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 88 - 93
Copyright
Copyright © Astronomical Society of Australia 2003

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