Pitch Angle Restriction in late Type Spiral Galaxies.

Details Pitch Angle Restriction in late Type Spiral Galaxies. Pitch Angle Restriction in late Type Spiral Galaxies.

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932303p&link_type=abstract

American Astronomical Society, AAS Meeting #219, #323.03

Astronomy and Astrophysics

Astronomy

Scientific paper

With a set of models for low bulge mass spiral galaxies (late type as defined by Hubble classification), that include a novel 3-D self-gravitating potential based on density distribution for spiral arms (PERLAS), instead of the usual 2D approximations (cosine potentials), we have analyzed the galactic orbital dynamics as a function of the pitch angle (going from 10 to 60 degrees). We found, from an extensive orbital study in phase space, that for late spiral galaxies, with angles lager than 50 deg, chaos may become pervasive, having the effects of destroying the order phase space surrounding the main stable periodic orbits that sculpt spiral arms and even destroying them. This result is in good agreement with observations of late spiral galaxies, where the maximum observed pitch angle is about 50 degrees.

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