TTF image of NGC2915 with
faint HII regions marked
TTF image of NGC2915 with faint HII regions marked |
One of the problems posed by extended HI disks, like those seen around NGC2915 and NGC1705, is that they have a significent velocity dispersion. Energy must be injected into these disks to keep them from collapsing and forming stars. We have obtained some very deep H-alpha images of NGC2915 with the Taurus Tunable Filter on the Anglo-Australian Telescope. These have revealed some very faint HII regions beyond the known optical extent of NGC2915. While the stellar population they trace probably does not contribute significantly to the total mass of this system, it may significantly heat the disk. To learn more, see our AAS poster on this work. |
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