Abstract
We have obtained integral-field spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first two-dimensional survey directed solely at the bulges of spiral galaxies. Eleven galaxies of the sample do not have previous measurements of the stellar velocity dispersion (σ*). These data are designed to complement our Space Telescope Imaging Spectrograph program for estimating black hole masses in the range 106-108 M ⊙ using gas kinematics from nucleated disks. These observations will serve to derive the stellar dynamical bulge properties using the traditional Mg b and Ca II triplets. We use both cross-correlation and maximum penalized likelihood to determine projected σ* in these systems and present radial velocity fields, major axis rotation curves, curves of growth, and σ* fields. Using cross-correlation to extract the low-order two-dimensional stellar dynamics we generally see coherent radial rotation and irregular velocity dispersion fields suggesting that is a nontrivial parameter to estimate.
Original language | English (US) |
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Pages (from-to) | 76-86 |
Number of pages | 11 |
Journal | Astrophysical Journal, Supplement Series |
Volume | 160 |
Issue number | 1 |
DOIs | |
State | Published - Sep 2005 |
Keywords
- Galaxies: kinematics and dynamics
- Galaxies: spiral
- Stellar dynamics
- Techniques: spectroscopic