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For refcode 1996AJ....112.2549R:
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1996AJ....112.2549R THE MORPHOLOGY OF THE STARS, ATOMIC GAS, AND IONIZED GAS IN THE BARRED SPIRAL GALAXY NGC 1530 MICHAEL W. REGAN, PETER J. TEUBEN, AND STUART N. VOGEL Department of Astronomy, University of Maryland, College Park, Maryland 20742 Electronic mail: mregan@astro.umd.edu, teuben@astro.umd.edu, vogel@astro.umd.edu THIJS VAN DER HULST Astronomy Department, University of Groningen, Electronic mail: vdhulst@astro.rug.nl Received 1996 March 12; revised 1996 September 5 ABSTRACT We present observations of the barred spiral galaxy NGC 1530 that we use to investigate the overall structure and gas content of the galaxy. We use sensitive H{alpha} Fabry-Perot observations of the ionized gas to determine the star forming rates in various regions of the galaxy. Westerbork H I observations are used to investigate the morphology of the atomic gas and combined with the H{alpha} Fabry-Perot to determine the rotation curve. From the rotation curve we derive a pattern speed of the bar of approximately 20 km s^-1^ kpc^-1^ that predicts resonances at locations that coincide with prominent morphological features, including three gaseous rings mapped in these observations: an outer ring of atomic hydrogen at a radius consistent with the outer Lindblad resonance, an inner ring seen in both atomic hydrogen and H{alpha}, and a nuclear ring of dust and molecular gas. These rings combined with the very strong spiral arms dominate the morphology of the galaxy.
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