Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718812d&link_type=abstract
American Astronomical Society Meeting 207, #188.12; Bulletin of the American Astronomical Society, Vol. 37, p.1482
Astronomy and Astrophysics
Astronomy
Scientific paper
We have made high-resolution images of the atomic hydrogen in NGC 157 using the B array of the Very Large Array. 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 an association between large HI density and the presence of ionized hydrogen regions. The rotation curve of the galaxy falls significantly from its peak value of ˜ 190 km/s, suggesting a less massive dark matter halo. The determinations of the rotation curve and HI flux distribution allow the calculation of total mass, HI mass, and mass-to-light ratios. We have detected a tail in the atomic hydrogen on the northern edge of the galaxy and a satellite; the more diffuse outer region of the galaxy appears 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.
Davis Lindsey Elspeth
Gottesman Stephen T.
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