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For refcode 1996ApJ...462..203Y:
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Copyright by American Astronomical Society. Reproduced by permission
1996ApJ...462..203Y THE NEUTRAL INTERSTELLAR MEDIUM IN NEARBY DWARF GALAXIES. I. LEO A L. M. YOUNG AND K. Y. LO Astronomy Department, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801 Received 1995 August 21; accepted 1995 November 9 ABSTRACT We present VLA observations of the 21 cm emission at 15" = 160 pc resolution in the nearby dwarf irregular galaxy Leo A. These new data reveal a previously unknown H I envelope or halo that extends to 9 kpc x 5 kpc (3 times the optical size of the galaxy) and surrounds the region of high column density where young stars and H II regions are found. H I line profiles in Leo A can be separated into a broad spectral component ({sigma} = 9 km s^-1^), observed everywhere in the galaxy and containing 80% of the H I mass, and a narrower component (3.5 km s^-1^), observed only in the central part of the galaxy near the H II regions. These spectral components may represent cold and warm phases of the neutral gas, analogous to those found in the Galaxy. The velocity field of H I in Leo A does show a gradient that may be due to rotation, but the observations are inconsistent with H I distributed in an inclined, circular disk supported by rotation. There is no compelling evidence that Leo A contains a significant amount of dark matter. Subject headings: galaxies: individual (Leo A) galaxies: ISM galaxies: kinematics and dynamics - radio lines: galaxies
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