Physics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..ses.fd002d&link_type=abstract
American Physical Society, 72nd Annual Meeting of the Southeastern Section of the APS, November 10-12, 2005, abstract #FD.002
Physics
Scientific paper
We have made high-resolution images of the atomic hydrogen in NGC 157. When combined with the radio observations of Ryder et al. (1998), these allow a more detailed look at the structure of the extended HI disk of NGC 157. In the inner part of the HI disk we found a close association between large HI density and the presence of ionized hydrogen regions. The rotation curve falls to ˜120 km s-1, nearly half its peak value, a steep drop that may imply a truncated disk. The determinations of the rotation curve and flux distribution allow the calculation of total mass, HI mass, and mass--to-light ratios. We have detected a tail in the HI leading to a satellite. We believe that the more diffuse outer region has been strongly disturbed by interaction with the satellite. The absence of a corresponding optical source for the satellite galaxy suggests a high mass-to-light ratio.
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