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Unformatted text preview: situations without coming close to the nucleus. Also, the net inflow needed to fuel the nucleus may be very tiny at large radii and easily lost in the details of galaxy dynamics. One glaring example of this is in seeking bar-driven gas flows. Bars and oval distortions will populate orbits along the bar, and the observed velocities from such flows are very large compared to net inward streaming of gas as it loses angular momentum to collisions. Thus its kinematic signature will be swamped. Quillen et al. (1995 ApJ 441, 549) have used the 1/ r nature of the gravitational potential and K-band imaging to estimate the potential shape and infer the inflow rate from calculated torques on the gas-rich dust lanes in a few nearby bared spirals, pointing to one avenue that can (more or less) measure mass inflow on kpc scales....
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- Fall '10
- Astronomy, Velocity