Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 311, Issue 1, Pages 1-22Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2000.03027.x
Keywords
galaxies : active; galaxies : individual : 3C 324; galaxies : individual : 3C265; galaxies : ISM; radio continuum : galaxies
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Deep long-slit spectroscopic data are presented for a sample of 14 3CR radio galaxies at redshift z similar to 1, previously studied in detail using the Hubble Space Telescope, the Very Large Array, and the UK Infrared Telescope (UKIRT). Analysis of the [O II] 3727 emission-line structures at similar to 5 Angstrom spectral resolution is carried out to derive the kinematic properties of the emission-line gas. In line with previous lower resolution studies, a wide variety of kinematics are seen, from gas consistent with a mean rotational motion through to complex structures with velocity dispersions exceeding 1000 km s(-1). The data confirm the presence of a high-velocity gas component in 3C 265 and detached emission-line systems in 3C 356 and 3C 441, and show for the first time that the emission-line gas in the central regions of 3C 324 is composed of two kinematically distinct components. Emission-line fluxes and the colour of the continuum emission are determined down to unprecedentedly low observed wavelengths, lambda < 3500 Angstrom, sufficiently short that any contribution of an evolved stellar population is negligible. An accompanying paper investigates the variation in the emission-line ratios and velocity structures within the sample, and draws conclusions as to the origin of the ionization and kinematics of these galaxies.
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