Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3903s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #39.03; Bulletin of the American Astronomical Society, V
Other
Scientific paper
High angular resolution spectra obtained with HST/STIS in the starburst region allow a unique study of the base of the M82 wind with a spatial resolution of 1 pc. The spectra are analyzed to yield ionized gas kinematics, electron densities and, where H beta measurements are available, interstellar reddening. Radial velocities follow the main M82 rotation curve defined by dense gas, indicating that the optically bright regions are in the main starburst zone. Within these regions we find H alpha often consists of narrow and broad components, with only modest velocity offsets from each other. This can be understood as a signature of mass loading of warm ionized gas into the high pressure hot ISM that is prominent in and around the starburst clumps. Variations in line widths and intensities occur on scales of a few pc, consistent with models where compact star clusters are important factors in structuring the ISM. We discuss these results in the context of starburst clumps and their constituent compact young star clusters driving a wind in the barred starburst galaxy that is M82.
de Grijs Richard
Gallagher John S. III
O'Connell Robert West
Rosario David J.
Smith Linda J.
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