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Polarimetry of GPS and CSS Sources

Published online by Cambridge University Press:  05 March 2013

W. D. Cotton ,
D. Dallacasa ,
C. Fanti ,
R. Fanti ,
A. R. Foley ,
R. T. Schilizzi ,
R. Spencer ,
D. J. Saikia  and
S. Garrington
W. D. Cotton
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 USA. bcotton@nrao.edu
D. Dallacasa
Affiliation:
Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129, Bologna, Italy. ddallaca@ira.cnr.it Dipartimento di Astronomia, Universitá di Bologna, via Ranzani 1, I-40127 Bologna, Italy. cfanti@astbo1.cnr.itrfanti@astbo1.bo.cnr.it
C. Fanti
Affiliation:
Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129, Bologna, Italy. ddallaca@ira.cnr.it Dipartimento di Astronomia, Universitá di Bologna, via Ranzani 1, I-40127 Bologna, Italy. cfanti@astbo1.cnr.itrfanti@astbo1.bo.cnr.it
R. Fanti
Affiliation:
Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129, Bologna, Italy. ddallaca@ira.cnr.it Dipartimento di Astronomia, Universitá di Bologna, via Ranzani 1, I-40127 Bologna, Italy. cfanti@astbo1.cnr.itrfanti@astbo1.bo.cnr.it
A. R. Foley
Affiliation:
Netherlands Foundation for Research in Astronomy, Postbus 2, NL-7990 AA Dwingeloo, The Netherlands. foley@astron.nl
R. T. Schilizzi
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, NL-7990 AA Dwingeloo Sterrenwacht Leiden, Postbus 9513, NL-2300 RA Leiden, The Netherlands. schilizzi@jive.nl
R. Spencer
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire SK11 9Dl, UK. res@jb.man.ac.ukstg@jb.man.ac.uk
D. J. Saikia
Affiliation:
Tata Institute of Fundamental Reasearch, National Centre for Radio Astrophysics, Pune 411 007, India. djs@ncra.tifr.res.in
S. Garrington
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire SK11 9Dl, UK. res@jb.man.ac.ukstg@jb.man.ac.uk
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Abstract

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The role of radio polarimetry in the understanding of GPS and CSS sources is explored. After an initial discussion of what can be learned from polarimetry, the expectations of a simple evolutionary sequence of GPS/CSO to CSS to FR I/FR II sources are explored. Observational results are then compared with the expectations. Conclusions include: the GPS category is likely not a single homogeneous class of objects; Faraday depth effects are very strong inside the inner 3 kpc of CSS and CSO sources; in at least 3C 138 the Faraday screen has very fine scale (subparsec) structure; and there is evidence for increased ionisation near bends in some CSS jets probably due to jet–ISM interaction. New results on 3C 138, 3C 43, and 3C 454 are given.

Keywords

polarisationgalaxies: activegalaxies: ISMgalaxies: jetsradio continuum: galaxiesradio continuum: ISM
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 12 - 15
Copyright
Copyright © Astronomical Society of Australia 2003

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