Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732803j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #328.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
1
Scientific paper
NGC 1569 is a post-starburst dwarf irregular (dIm) galaxy located in the IC 342 galaxy group. It has 3 supermassive star clusters (SSCs) and is a well studied object in the literature. We present an in depth study of the kinematics of the stellar and gas disks of NGC 1569 and analyze the three dimensional shape of this dIm galaxy. There are three forms of data we use to determine the shape of this system. First, we obtained long-slit, high resolution spectroscopy of the stars in NGC 1569 using the KPNO 4-meter + Echelle spectrograph. For these stellar spectra, we used a filter that targets the Mg Ib absorption features. During one of our 4-meter+Echelle observing runs, we changed the filter to target the [OIII]λ5007Å emission line. Using this filter, we observed radial velocities of the ionized gas in NGC 1569, the second form of data in our study. Thirdly, we used high spatial and high spectral resolution, 21 cm, VLA HI line data obtained by THINGS. These data were mapped using a multi-scale cleaning algorithm implemented in AIPS by the LITTLE THINGS team. The kinematics of the gas were obtained using a double Gaussian decomposition method to separate a bulk motion velocity field from random, non-circular motions. In addition to the kinematic study, we also present our results of a large, 9° x 2° HI emission map made using the Robert C. Byrd Green Bank Telescope. We detect large-scale HI structure around NGC 1569 indicative of possible interactions with IC 342 galaxy group members. We conclude the dissertation talk by highlighting two more dwarf irregular galaxies for which both stellar and gas kinematics have been obtained and analyzed. This research has been funded by the NSF LITTLE THINGS grant AST-0707563 and by the NRAO Student Observing Support award GSSP10-0001.
Hunter Deidre
Jackson Megan C.
Little Things Team
Oh Seongshik
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