Journal
ASTRONOMY & ASTROPHYSICS
Volume 436, Issue 2, Pages 493-501Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042425
Keywords
galaxies : active; galaxies : individual : 3C 67; galaxies : individual : 3C 277.1; galaxies : individual : 3C 303.1; galaxies : quasars : emission lines
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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.
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