Volume 488, Number 3, September IV 2008
|Page(s)||L59 - L62|
|Published online||01 August 2008|
Letter to the Editor
Tracing jet–ISM interaction in young AGN: correlations between [O III] λ 5007 Å and 5-GHz emission
Departamento de Astrofísica Molecular e Infrarroja, Instituto de Estructura de la Materia (CSIC), Madrid, Spain e-mail: email@example.com
2 Kapteyn Astronomical Institute, Groningen 9700 AV, The Netherlands
3 Department of Physics, Rochester Institute of Technology, Rochester, NY 14623, USA
Accepted: 17 July 2008
Aims. I study the interaction between young AGN and their host galaxies based on their ionized gas and radio emission, and analyze possible implications for radio galaxy evolution.
Methods. The  λ 5007 Å line and 5-GHz radio properties are compared and studied for a large, representative sample of GPS and CSS (i.e., young) quasars and radio galaxies, and large-scale sources using  λ 5007 Å line and 5-GHz radio data from the literature and our own observations.
Results. Several correlations between the  λ 5007 Å line and 5-GHz radio emission were found. The main result is that the  λ 5007 Å emission is strongly correlated with the GPS/CSS source size, which indicates that the  λ 5007 Å emission is enhanced significantly by the jet expansion through the host galaxy ISM. Shocks are the most likely enhancement mechanism, although jet-induced star formation could be also, partly, responsible for the  λ 5007 Å emission. The data also suggests that the jet possibly decelerates as it grows, although the correlation expansion speed versus radio size is weak.
Key words: galaxies: active / galaxies: jets / galaxies: interactions / ISM: jets and outflows
© ESO, 2008
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