Space Telescope Imaging Spectrograph spectroscopy of the emission-line gas in the nuclei of nearby FR-I galaxies

作者：Noel Storr J^*; Baum SA; Kleijn GV; van der Marel RP; O'Dea CP; de Zeeuw PT; Carollo CM

来源：Astrophysical Journal, The - Supplement Series, 2003, 148(2): 419-472.

• galaxies : active
• galaxies : elliptical and lenticular, cD galaxies : kinematics and dynamics
• galaxies : nuclei

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 Halpha and the derived 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 Halpha) by 486 +/- 443 km s(-1).

• 出版日期2003-10