- [*] STIS spectroscopy of gas disks in the nuclei of nearby, radio-loud
- Noel-Storr J., Carollo C.M., Baum S.A., van der Marel R.P.,
O'Dea C.P., Verdoes Kleijn G.A., de Zeeuw P.T.
- in `The central kiloparsec of starbursts and AGN',
Knapen J.H., Beckman J.E., Shlosman I., Mahoney T.J., eds.,
ASP Conference Series, in press, 2001
- © 2001. Astronomical Society of the Pacific.
All Rights Reserved.
We present initial results of our analysis of line emission produced
in gas disks found at the centers of a sample of nearby, radio
galaxies with radio jets. We obtained data using STIS (The Space
Telescope Imaging Spectrograph) at three parallel slit positions on
the nucleus of each galaxy. This allows us to map the H$\alpha$ +
[NII] flux, the gas radial velocity and the velocity dispersion. We
find evidence of rotating disks in 11 of the sample galaxies and we
can not currently rule out a rotating disk model for the remaining
eight. For rotating systems, we find that the minimum central enclosed
mass is greater than or similar to the predicted black hole mass based
on ground-based stellar velocity dispersions. By modeling the gas
dynamics we will go on to constrain the masses of the black holes. We
will also investigate the properties of the gas disks themselves,
giving us an insight into fueling, ionization mechanisms and the
structure of the central regions.
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Last modified June 22, 2001.
Roeland van der Marel,