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The Impact of the Early Stages of Radio Source Evolution on the ISM of the Host Galaxies

Published online by Cambridge University Press:  05 March 2013

R. Morganti ,
C. N. Tadhunter ,
T. A. Oosterloo ,
J. Holt ,
A. Tzioumis  and
K. Wills
R. Morganti
Affiliation:
ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands. morganti@astron.nl
C. N. Tadhunter
Affiliation:
University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK. c.tadhunter@sheffield.ac.uk, j.holt@sheffield.ac.uk, k.wills@sheffield.ac.uk
T. A. Oosterloo
Affiliation:
ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands. morganti@astron.nl
J. Holt
Affiliation:
University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK. c.tadhunter@sheffield.ac.uk, j.holt@sheffield.ac.uk, k.wills@sheffield.ac.uk
A. Tzioumis
Affiliation:
ATNF, PO Box 76, Epping NSW 1710, Australia. atzioumi@atnf.csiro.au
K. Wills
Affiliation:
University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK. c.tadhunter@sheffield.ac.uk, j.holt@sheffield.ac.uk, k.wills@sheffield.ac.uk
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Abstract

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The study of both neutral and ionised gas in young radio sources is providing key information on the effect the radio plasma has on the ISM of these objects. We present results obtained for the compact radio sources PKS 1549–79, 4C 12.50 and PKS 1814–63 and for the intermediate-size radio galaxy 3C 459. At least in the first two, low ionisation optical emission lines and HI absorption appear to be associated with the extended, but relatively quiescent, dusty cocoon surrounding the nucleus. The [OIII] lines are, on the other hand, mostly associated with the region of interaction between the radio plasma and the ISM, indicating a fast outflow from the centre. A case of fast outflow (up to ∼1000 km s-1) is also observed in HI in the radio source 4C 12.50. As the radio source evolves, any obscuring material along the radio axis is swept aside until, eventually, cavities (of the same kind as observed e.g. in Cygnus A) are hollowed out on either side of the nucleus. We may witness this phase in the evolution of a radio source in the radio galaxy 3C 459.

Keywords

galaxies: ISMgalaxies: activeradio lines: galaxies
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 129 - 133
Copyright
Copyright © Astronomical Society of Australia 2003

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