Space telescope imaging spectrograph spectroscopy of the emission-line gas in the nuclei of nearby FR-I galaxies

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Title: Space telescope imaging spectrograph spectroscopy of the emission-line gas in the nuclei of nearby FR-I galaxies
Author: Noel-Storr, Jacob; Baum, Stefi; Kleijn, Gijs; van der Marel, Roeland; O'Dea, Christopher; Zeeuw, P. Tim; Carollo, C. Marcella
Abstract: We present the results of the analysis of a set of medium resolution spectra, obtained by the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, of the emission line gas present in the nuclei of a complete sample of 21 nearby, early-type galaxies with radio jets (the UGC FR-I Sample). For each galaxy nucleus we present spectroscopic data in the region of Hα and the dervived kinematics. We find that in 67% of the nuclei the gas appears to be rotating and, with one exception, the cases where rotation is not seen are either face on or have complex central morphologies. We find that in 62% of the nuclei the fit to the central spectrum is improved by the inclusion of a broad component. The broad components have a mean velocity dispersion of 1349 ± 345 km s−1 and are redshifted from the narrow line components (assuming an origin in Hα) by 486 ± 443 km s−1 (Refer to PDF file for exact formulas).
Description: Also archived in: arXiv: astro-ph/0306043 v1 2 Jun 2003
Record URI: http://hdl.handle.net/1850/1747
Date: 2003-10

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