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A&A 477, 491-501 (2008)
DOI: 10.1051/0004-6361:20077112
Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxies
A. Labiano1, 2, C. P. O'Dea3, P. D. Barthel2, W. H. de Vries4, 5, and S. A. Baum61 Departamento de Astrofísica Molecular e Infrarroja, Instituto de Estructura de la Materia (CSIC), Madrid, Spain
e-mail: labiano@damir.iem.csic.es
2 Kapteyn Astronomical Institute, Groningen, 9700 AV, The Netherlands
3 Department of Physics, Rochester Institute of Technology, Rochester, NY 14623, USA
4 University of California, Davis, CA 95616, USA
5 Lawrence Livermore National Laboratory, IGPP, Livermore, CA 94550, USA
6 Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623, USA
(Received 17 January 2007 / Accepted 29 October 2007)
Abstract
Aims.We are searching for star formation regions in the hosts of potentially young radio
galaxies (gigahertz peaked spectrum and compact steep spectrum sources).
Methods.We used near-UV imaging with the Hubble Space Telescope Advanced Camera for Surveys.
Results.We find near-UV light could be the product of recent star formation in
five of the nine observed sources, though other explanations are not currently
ruled out. An additional two sources show marginal detections.
The UV luminosities of the GPS and CSS sources are similar to those
of a sample of nearby large-scale radio galaxies. Stellar-population synthesis models
are consistent
with a burst of recent star formation occurring before the formation of the radio
source. However, observations at other wavelengths and colors are needed
to definitively establish the nature of the observed UV light.
In the CSS source
1443+77
, the near-UV
light is aligned with and is co-spatial with the radio source.
We suggest that the UV light in this source is produced by star formation
triggered and/or enhanced by the radio source.
Key words: galaxies: active -- galaxies: starburst -- galaxies: evolution -- galaxies: stellar content -- galaxies: interactions -- ultraviolet: galaxies
© ESO 2007