Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1098b&link_type=abstract
Astronomical Journal, vol. 87, Aug. 1982, p. 1098-1105.
Astronomy and Astrophysics
Astronomy
6
Astronomical Photometry, Disk Galaxies, Galactic Clusters, Galactic Structure, Radio Astronomy, Spiral Galaxies, Astronomical Maps, Galactic Rotation, Hydrogen Clouds, Images, Red Shift
Scientific paper
Results are presented of 21-cm VLA observations of the late-type spiral galaxies UGC 12423 and NGC 7591, both located in the Pegasus I cluster of galaxies. The optical image of UGC 12423 reveals the galaxy to be highly flattened, possessing a thin optical disk that is noticeably warped. Its 21-cm observations show a similar morphology for the H I and suggests a rising rotation curve as well. These features may explain the galaxy's discrepant location in the infrared Tully-Fisher diagram. The observations of UGC 12423 reveal that the total linear extent of the H I is at least 60 kpc (H(0) = 100 km/sec per Mpc), which exceeds the optical image of the galaxy by about 50%. Comparable conclusions apply to NGC 7591, but with less certainty. The existence of extended H I in cluster galaxies may imply that a significant interaction (i.e., stripping) with the environment has not yet occurred.
Balick Bruce
Bothun Gragory D.
Skillman Evan
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