Next Section: Introduction

The Declining Rotation Curve of NGC 157

Stuart D. Ryder
School of Physics, University of New South Wales,
Sydney 2052, Australia.
sdr@newt.phys.unsw.edu.au

A. Zasov
Sternberg Astronomical Institute, Moscow State University,
Universitetskij Prospect 13, 119899 Moscow, Russia.
zasov@sai.msu.su

V. McIntyre
Department of Physics, University of Wollongong,
Northfields Ave., NSW 2522, Australia.
vjm@davinci.sci.uow.edu.au

- W. Walsh
School of Physics, University of New South Wales,
Sydney 2052; and Australia Telescope National Facility,
P.O. Box 76, Epping, NSW 2121, Australia.
wwalsh@atnf.csiro.au

Abstract:

We have found strong evidence for an abrupt decline in the HI rotation curve of the isolated spiral galaxy NGC 157. Various mass models to account for this, and the implications for the dark matter content of NGC 157, are discussed.

Keywords: galaxies: individual (NGC 157) -- galaxies: kinematics and dynamics -- galaxies: spiral -- radio lines: galaxies

© Copyright Astronomical Society of Australia 1997