Dynamics of Inner Galactic Disks: The Striking Case of M100

Details Dynamics of Inner Galactic Disks: The Striking Case of M100 Dynamics of Inner Galactic Disks: The Striking Case of M100

1996-02-29

arxiv.org/abs/astro-ph/9602151v1

Astronomy and Astrophysics

Astrophysics

11 pages, postscript, compressed, uuencoded. Paper and 4 figures available at ftp://pa.uky.edu/shlosman/nobel or at http://w

Scientific paper

We investigate gas dynamics in the presence of a double inner Lindblad resonance within a barred disk galaxy. Using an example of a prominent spiral, M100, we reproduce the basic central morphology, including four dominant regions of star formation corresponding to the compression maxima in the gas. These active star forming sites delineate an inner boundary (so-called nuclear ring) of a rather broad oval detected in the near infrared. We find that inclusion of self-gravitational effects in the gas is necessary in order to understand its behavior in the vicinity of the resonances and its subsequent evolution. The self-gravity of the gas is also crucial to estimate the effect of a massive nuclear ring on periodic orbits in the stellar bar.

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