1998AJ....116.1169M -
Astron. J., 116, 1169-1185 (1998/September-0)
High-resolution, high signal-to-noise, global H I spectra of southern, extreme late-type spiral galaxies.
MATTHEWS L.D., VAN DRIEL W. and GALLAGHER III J.S.
Abstract (from CDS):
We have used the Nanay decimetric radio telescope to obtain high-resolution, high signal-to-noise, global H I spectra of 30 southern, extreme late-type spiral galaxies with Vh ≤ 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.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Fundamental Parameters - Galaxies: Spiral - Radio Emission Lines
Nomenclature:
Table 5: [MVG98] ESO 363-8 b N=1, [MVG98] AM 0643-272 a (Nos a-b).
Simbad objects:
41
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