Emission-line Imaging of the Local Group Starburst Galaxy IC 10

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Scientific paper

The Local Group dwarf galaxy IC 10 is currently undergoing an extensive burst of star formation, as indicated by its luminous H 2 regions and a high density of Wolf-Rayet stars. As part of a multi-wavelength study, we have obtained images of this remarkable galaxy with Hα , Hβ , [S 2], and [O 3] filters at the Apache Point Observatory 3.5m telescope. The complex morphology noted in prior Hα observations is seen in the other emission lines, although the high line-of-sight reddening (E(B-V) ~ 0.85) severely limits our sensitivity in Hβ and [O 3]. We are using these data to identify candidate supernova remnants and Wolf-Rayet shells, and, in conjunction with longslit spectra, to obtain reddening measurements for the major H 2 regions.

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