Volume 436, Number 2, June III 2005
|Page(s)||493 - 501|
|Published online||30 May 2005|
HST/STIS low dispersion spectroscopy of three Compact Steep Spectrum sources
Evidence for jet-cloud interaction
Kapteyn Astronomical Institute, Groningen, 9700 AV, The Netherlands e-mail: [labiano;pdb]@astro.rug.nl
2 Space Telescope Science Institute, Baltimore, MD 21218, USA e-mail: email@example.com
3 Department of Physics, Rochester Institute of Technology, Rochester, NY 14623, USA e-mail: firstname.lastname@example.org
4 Western Kentucky University, Bowling Green, KY 42101, USA e-mail: email@example.com
5 Lawrence Livermore National Lab., Livermore, CA 94550, USA e-mail: firstname.lastname@example.org
6 Department of Physics, Rochester Institute of Technology, Rochester, NY 14623, USA e-mail: email@example.com
7 Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623, USA e-mail: firstname.lastname@example.org
8 Osservatorio Astronomico di Torino, Pino Torinesse (TO) 10025, Italy e-mail: email@example.com
9 Istituto di Radioastronomia del CNR, Bologna 40129, Italy e-mail: firstname.lastname@example.org
10 Netherlands Foundation for Astronomy, Dwingeloo 7990 AA, The Netherlands e-mail: email@example.com
11 University of Sheffield, Western Bank, Sheffield S10 2TN, UK e-mail: C.Tadhunter@sheffield.ac.uk
Accepted: 4 March 2005
We present Hubble Space Telescope Imaging Spectrograph long-slit spectroscopy of the emission line nebulae in the compact steep spectrum radio sources 3C 67, 3C 277.1, and 3C 303.1. We derive BPT (Baldwin- Philips-Terlevich; Baldwin et al. 1981) diagnostic emission line ratios for the nebulae which are consistent with a mix of shock excitation and photo-ionization in the extended gas. In addition, line ratios indicative of lower ionization gas are found to be associated with higher gas velocities. The results are consistent with a picture in which these galaxy scale radio sources interact with dense clouds in the interstellar medium of the host galaxies, shocking the clouds thereby ionizing and accelerating them.
Key words: galaxies: active / galaxies: individual: 3C 67 / galaxies: individual: 3C 277.1 / galaxies: individual: 3C 303.1 / galaxies: quasars: emission lines
© ESO, 2005
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