Mathematics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sgmc.book.....a&link_type=abstract
A spiral galaxy model combining the density wave and self-propagating star formation., by Auer, R.. Heidelberg Univ. (Germany).
Mathematics
1
Scientific paper
The spiral arms found in galactic disks were well-explained by the density wave theory. The spiral shape of the density waves has been reproduced by numerical experiments as well. According to the standard theory, the waves lead to an increased build-up of molecular clouds within the wave. When these molecular clouds grow more massive than permitted by the Jeans mass, they collapse and form young, bright stars. An alternative to this scenario is the idea of self-propagating star formation (SPSF). SPSF is a cycle in which the expanding shock waves from supernovae induce the collapse of a molecular cloud. Some of the new stars that develop out of this cloud may become supernovae as well. In that case, the cycle begins anew. In this work, a numerical model was developed and used to show that the density wave is less effective in building up molecular clouds to a point in which they can collapse to create new stars and more effective in organising the SPSF along its arms.
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