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| Paper: |
The Story of UGC 11919: An Unusual Spiral Galaxy Possibly Having a Warp and Peculiarly Low Mass-to-Light Ratio |
| Volume: |
486, Multi-Spin Galaxies |
| Page: |
73 |
| Authors: |
Saburova, A. S.; Józsa, G. I. G.; Zasov, A. V.; Bizyaev, D. V.; Uklein, R. I. |
| Abstract: |
We present the results of a multi-wavelength study of the spiral galaxy UGC 11919 to verify that the galaxy has a peculiarly low dynamical mass-to-light ratio (M/LB) and to study its kinematical structure in general. We obtained an H I data cube of UGC 11919 with the Westerbork Synthesis Radio Telescope parallel with photometric observations with the Apache Point 0.5-m telescope. Two complementary models of the H I data cube provide a reasonable fit to the data: a model representing a symmetric S-shaped warp and a flat disc model with the deviations from axial symmetry caused by noncircular or bar streaming motions. In both cases UGC 11919 appears to have a disk of unusually low dynamical mass-to-light ratio in spite of its red color and a dark halo of moderate mass. A bottom-light stellar initial mass function could explain the results. Stellar kinematic profiles derived from long-slit observations, with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, show a signature of kinematically decoupled nuclear disk in the galaxy. |
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