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For refcode 2000AJ....120.2975S:
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2000AJ....120.2975S A COMPARATIVE STUDY OF STAR-FORMING AND QUIESCENT DWARF GALAXIES CAROLINE E. SIMPSON Department of Physics, Florida International University, Miami, FL 33199; simpsonc@fiu.edu AND S. T. GOTTESMAN Department of Astronomy, University of Florida, Gainesville, FL 32611; gott@astro.ufl.edu Received 1999 April 14; accepted 2000 August 25 ABSTRACT We present the results from a comparative study of the atomic hydrogen (H I) and optical properties of a sample of 16 dwarf galaxies, chosen to investigate the effects of star formation on the properties of low-mass systems. The violent star formation bursts believed to occur in these low- mass systems suggest a possible connection between the actively star- forming blue compact dwarfs (BCDs), and the quiescent low surface brightness dwarfs (LSBDs). It has been suggested that LSBDs, upon undergoing a burst of star formation, will evolve into BCDs and then back into LSBDs when the star formation slows or stops as the H I column density falls below the critical threshold necessary to support it. We have examined the location and kinematics of H I in eight BCDs and eight LSBDs of similar H I masses and a range of color indices to investigate this "evolutionary" sequence. The starburst episodes in these low-mass galaxies should lead to (1) a dispersal/depletion of the H I seen in the eight LSB dwarfs and (2) more centrally concentrated and agitated H I in the eight BCDs. The results of this project indicate that the quiescent LSBD galaxies have more diffuse H I distributions and often show a ringlike structure, while the active galaxies have more highly centrally concentrated H I reservoirs. The bluer, more recently active systems of both types also have higher internal H I velocity dispersions, indicating that energy has been pumped into the interstellar medium of these galaxies. These observations are consistent with an evolutionary scheme wherein the H I reservoirs in these galaxies take on different characteristics depending upon their star formation histories. Key words: galaxies: dwarf-galaxies: evolution-galaxies: fundamental parameters-ISM: H I
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