What Drives the Central Velocity Dispersion in Nearby Early-Type Galaxies?

Details What Drives the Central Velocity Dispersion in Nearby Early-Type Galaxies? What Drives the Central Velocity Dispersion in Nearby Early-Type Galaxies?

2003-04-02

arxiv.org/abs/astro-ph/0304052v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. To appear in "Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galaxies,

Scientific paper

The majority of nearby early-type galaxies contains detectable amounts of emission-line gas at their centers. The emission-line ratios and gas kinematics potentially form a valuable diagnostic of the nuclear activity and gravitational potential well. The observed central gas velocity dispersion often exceeds the stellar velocity dispersion. This could be due to either the gravitational potential of a black hole or turbulent shocks in the gas. Here we try to discriminate between these two scenarios.

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