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For refcode 1995AJ....109..594K:
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1995AJ....109..594K LARGE SCALE STRUCTURE OF THE IONIZED GAS IN THE MAGELLANIC CLOUDS ROBERT C. KENNICUTT, JR AND FABIO BRESOLIN Steward Observatory, University of Arizona, Tucson, Arizona 85721 Electronic mail: rkennicufl@as.arir:ona.edu, fbresolin@a5.anrrona.edu DOMINIK J. BOMANS Sternwarte der Universitat Bonn, Auf dem Hugel 71, D-53121 Bonn, Germany Electronic mail: bomans@astro.uni-bonn.de GREGORY D. BOTHUN Department of Physics, University of Oregon, Eugene, Oregon 97403 Electronic mail: nuts@moo.uoregon.edu IAN B. THOMPSON Carnegie Observatories, 813 Santa Barbara St., Pasadena, California 91101 Electronic mail: ian@lynx.ociw.edu Received 1994 September 9 ABSTRACT Calibrated H{alpha} CCD images taken With the "Parking Lot Camera" are used to investigate the large scale properties of the ionized gas in the Magellanic Clouds. The integrated H{alpha} luminosity, star formation, and the large-scale diffuse emission are studied and compared with other galaxies. The diffuse gas component accounts for 30%-40% of the total H{alpha} emission in both galaxies. The integrated star formation rates and the fraction of diffuse emission are typical for Magellanic irregular galaxies. The H{alpha} maps are used to derive a set of physical parameters for the known supergiant shells in the LMC and SMC. The H{alpha} emission distribution have also been compared to the distribution of HI column density. Evidence for a star formation threshold is discussed.
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