Dynamics of disk galaxies under eccentric perturbations and the effect of radiative thermal exchange on the rotation of lower mass protostars

Details Dynamics of disk galaxies under eccentric perturbations and the effect of radiative thermal exchange on the rotation of lower mass protostars Dynamics of disk galaxies under eccentric perturbations and the effect of radiative thermal exchange on the rotation of lower mass protostars

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........1z&link_type=abstract

Thesis (PhD). CORNELL UNIVERSITY, Source DAI-B 61/03, p. 1452, Sep 2000, 97 pages.

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In the first part of this dissertation, the dynamics of disk galaxies are treated using a representation in a number of circular rings*. The rings are assumed to be rigid and oscillate in a plane. Motion of matter within each ring is taken into account. Eccentric perturbations are studied. First the axisymmetric equilibrium configuration of the galaxy is discussed. After that eccentric perturbations are described. The ring representation is then applied and relevant equations of motion derived. Various formulas involving coefficients of terms in the equations of motion are derived. Angular momentum transport is then discussed with the results of numerical solutions of the equations of motion. Besides the disk, two other components: the galactic bulge, and the dark matter halo are also included, but only as passive sources of gravity. The central region of the disk is handled separately; it may contain a black hole. The second part of this dissertation treats protostars. It is shown that radiative thermal exchange can significantly reduce the angular momentum of a rapidly spinning protostar. The mechanism is especially important for high temperature and large surface area. Also, it is expected that the mechanism is most relevant to lower mass protostars, since they may be embedded inside H II regions which have high temperatures. *This first part of the dissertation is related to [15] (Lovelace, R. V. E., Zhang, L., Kornreich, D. A., & Haynes, M. P. 1999, THE ASTROPHYSICAL JOURNAL, 524, 634, published by the University of Chicago Press,© 1999.The American Astronomical Society. All rights reserved).

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