Mass models and kinematics of barred spiral galaxies.

Details Mass models and kinematics of barred spiral galaxies. Mass models and kinematics of barred spiral galaxies.

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmkb.book.....w&link_type=abstract

Mass models and kinematics of barred spiral galaxies., by Wilke, K.. Heidelberg Univ. (Germany). Naturwissenschaftlich-Mathemat

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Due to their strong non-axisymmetric potential, barred galaxies exhibit peculiar kinematics with distinct features. Self consistent stationary models are computed for the three intermediate-type barred spirals NGC 2336, NGC 3992 and NGC 7479 to reproduce the observed kinematics in those regions affected by the bar. In an iterative procedure model parameters are fixed by computing and evaluating a large number of different models in such a way that they show small deviations from the observed parameters only and, at the same time, predict the kinematics of warm H II-gas correctly. A two-dimensional model of the observed surface brightness distribution is constructed from optical and NIR data, consisting of a bulge, a bar and a disk. The brightness distribution is converted into a mass model. The potentials of the components are implemented in a numerical code to compute closed orbits for test particles. For different particle energies closed orbits are computed and projected into the reference frame of the galaxy. Artificial rotation curves are constructed for every model. It is shown that the model parameter values from both sources, the optimal models that predict the observed kinematics of warm gas quite well, and the morphological decompostion are consistent (with justified exceptions).

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