Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545710j&link_type=abstract
American Astronomical Society, AAS Meeting #215, #457.10; Bulletin of the American Astronomical Society, Vol. 42, p.481
Astronomy and Astrophysics
Astronomy
Scientific paper
The intrinsic shape of dwarf irregular (dIm) galaxies remains controversial. Projected minor-to-major axis ratios provide insufficient data to determine the shapes of dIm galaxies. However, the stellar velocity dispersion coupled with the maximum rotational velocity derived from HI observations gives a measure of how kinematically hot a system is, and, therefore, indicates its structure. We present the final results of the stellar kinematics of NGC 1569 obtained using the KPNO 4-meter + Echelle spectrograph. We turned the Echelle into a long-slit spectrograph by replacing the cross-disperser with a mirror flat and observed the stellar kinematics along 4 position angles of NGC 1569. These data are combined with high resolution, B-, C-, and D-array VLA 21 cm observations acquired by the THINGS collaboration. We also present the results of a new technique that is applied to the HI data for NGC 1569. This new procedure is capable of disentangling strong, non-circular motions from overall bulk rotation in dwarf galaxies that exhibit disturbed velocity fields such as NGC 1569. NOAO proposal #08B-0090 was approved for long-term status on the KPNO 4-meter telescope.
Hunter Deidre Ann
Jackson Megan C.
Oh Sang Hoon
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