Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........70b&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF WISCONSIN - MADISON, 1987.Source: Dissertation Abstracts International, Volume: 48-03, Sectio
Physics
Fabry -Perot
Scientific paper
Images of hydrogen Balmer alpha emission were obtained in the galactic plane at the Orion arm rest velocity at longitudes of 66, 96 and 114 degrees and at the Perseus arm velocity at 114 degrees. These directions were chosen because of their lack of bright nebular emission and their high SII 6731/H(alpha) ratio, a characteristic of the faint galactic emission-line background. The narrow band (0.26A) images were obtained during June and August 1985, and June 1986 with a newly-constructed RCA SID501DX CCD camera used with the existing 15 cm Fabry-Perot spectrometer at the Physical Sciences Laboratory of the University of Wisconsin, Madison. The field of view was 0(DEGREES)75, with each binned pixel covering about two arc minutes. All images show a significant variation in detected H(alpha) emission at the third of half degree scale. The emission intensity varies by a factor of two over each field of view. Comparison of Orion arm and Perseus arm results indicates extinction is the most likely cause of the observed spatial structure but star counts taken from the blue plate of the Palomar Sky Survey show little spatial correlation with the H(alpha) emission. This dilemma may be resolved by further investigations using IRAS images which were not available in time for inclusion in this thesis.
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