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Session 43 - The Diffuse ISM: Milky Way and Beyond.
Display session, Tuesday, June 11
Great Hall,

[43.07] An Imaging Survey of the Galactic H\alpha Emission

B. Dennison, G. A. Topasna, J. H. Simonetti (Virginia Tech)

We report on preliminary results from a high-resolution, high-sensitivity imaging survey of the galactic H\alpha emission. The survey is carried out using the Spectral Line Imaging Camera (SLIC) which incorporates a fast (f/1.2) lens attached to a cryogenic CCD in combination with a narrowband interference filter. The pixel size is 1.6 arcminutes and the diameter of each field is 10 degrees. The fast optics, narrow bandpass (1.7 nm) filter, and high quantum-efficiency, low-noise CCD yield a high brightness sensitivity to H\alpha emission (1\sigma\approx0.2 Rayleigh, which is equivalent to EM\approx0.4 pc cm^-6). The region presented at this time includes approximately 75^\circ < \ell < 163^\circ and -12^\circ < b < 1^\circ, as well as several extensions away from the galactic plane. Some faint features detected include a shell connected with the star forming region W4 extending 7^\circ above the galactic plane, and filaments possibly related to galactic loops II and III. This research was supported by NSF grant AST-9319670 and a grant from the Horton Foundation to Virginia Tech.

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