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For refcode 1998AJ....116.1169M:
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1998AJ....116.1169M HIGH-RESOLUTION, HIGH SIGNAL-TO-NOISE, GLOBAL H I SPECTRA OF SOUTHERN, EXTREME LATE-TYPE SPIRAL GALAXIES L. D. MATTHEWS Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800; matthews@gremlin.ess.sunysb.edu W. VAN DRIEL Uniti Scientifique Nangay, CNRS USR B704, Observatoire de Paris, 92195 Meudon, France; vandriel@mesioq.obspm.fr AND J. S. GALLAGHER III Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706; jsg@tiger.astro.wisc.edu Received 1998 February 24; revised 1998 June 5 ABSTRACT We have used the Nancay decimetric radio telescope to obtain high- resolution, high signal-to-noise, global H I spectra of 30 southern, extreme late-type spiral galaxies with V_h_ <= 3000 km s^-1^. For all of the galaxies we measure new precise radial velocities and H I velocity widths. Optical imaging and photometry of these galaxies was recently published by Matthews & Gallagher. In Appendix B we present new H I spectra for four additional late-type galaxies. The H I spectra of the extreme late-type spirals have velocity widths characteristic of true, rotationally supported disk galaxies, and most are double-peaked. Nonetheless, the morphologies of the H I profiles are diverse, indicating that disk galaxies with similar H I contents and optical luminosities can have very different H I distributions and/or velocity fields. H I profile type and Hubble type are generally well-correlated for our sample. Seventy-seven percent of our H I profiles show at least some degree of asymmetry; in many cases the stellar disk of these galaxies is also asymmetric. Several of our spectra have an additional H I peak near the systemic velocity, perhaps indicating a gas enhancement in the central regions of the galaxy disk. Key words: galaxies: fundamental parameters-galaxies: spiral -radio emission lines
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