Nuclear spirals: gas in asymmetric galactic potential with a massive black hole

Details Nuclear spirals: gas in asymmetric galactic potential with a massive black hole Nuclear spirals: gas in asymmetric galactic potential with a massive black hole

2004-08-02

arxiv.org/abs/astro-ph/0408024v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in the proceedings of the IAU Symp.222 "The Interplay among Black Holes, Stars and ISM in Galact

Scientific paper

10.1017/S1743921304002807

Nuclear spirals can provide a wealth of information about the nuclear potential in disc galaxies. They form naturally as a gas response to non-axisymmetry in the gravitational potential, even if the degree of this asymmetry is very small. Linear wave theory well describes weak nuclear spirals, but stronger asymmetries in the potential induce waves beyond the linear regime, which appear as spiral shocks. If a central massive black hole (MBH) is present, spiral shocks can extend all the way to its immediate vicinity, and generate gas inflow up to 0.03 Msun/yr. This coincides with the accretion rates needed to power local Active Galactic Nuclei.

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