- [*] STIS spectroscopy of gas disks in the nuclei of nearby, radio-loud
- Noel-Storr J., Baum S.A., Carollo C.M., O'Dea C.P., Verdoes Kleijn G.A.,
van der Marel R.P., de Zeeuw P.T.
- BAAS, in press, 2002 (AAS Meeting 199, 51.02)
- © 2001. The American Astronomical Society.
All Rights Reserved.
We present the 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 Halpha + [NII]
flux, the gas radial velocity and the velocity dispersion. We find we
can not rule out a rotating disk model for the gas in any case. For
rotating systems, we find the minimum central enclosed mass is greater
than or about the predicted black hole mass based on ground based
stellar velocity dispersions (e.g. Ferrarese & Merritt 2001, and
Gebhardt, et al. 2000). Using these data we will go on to investigate
the masses of black holes in this well-defined sample along with the
properties of the gas disks themselves, giving us an insight into
fueling, ionization mechanisms and structure of the central
regions. Support for this work was provided by NASA through grant
number HST-GO-08236.01-A from the Space Telescope Science Institute.
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Last modified November 15, 2001.
Roeland van der Marel,