Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916706v&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #167.06; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of high spatial resolution neutral hydrogen synthesis observations of the extremely metal-poor starbursting dwarf galaxy I Zw 18. Examination of neutral hydrogen maps made from the combination of data obtained in the A, B, C, and D configurations of the Very Large Array yields a peak HI column density of 2.4 ξ 1022 atoms cm-2 at 1.6" spatial resolution ( 120 pc linear resolution, assuming a distance of 15 Mpc). As expected, the peak gas column densities are associated with the intense starburst regions in the southeast and northwest. At this linear resolution, the gas distribution is clumpy and irregular. As seen in previous low resolution maps, there is a significant velocity gradient across the main body of I Zw 18. Further, the linear and clumpy nature of the extended gas distribution south of the main body is suggestive of a tidal tail. We examine the gas distribution and kinematics of I Zw 18 in the context of a possible dwarf-dwarf galaxy interaction and tidal stirring.
Cannon John M.
Skillman Evan D.
van Zee Liese
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