Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..957h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 4/AUG15, P. 957, 1994
Astronomy and Astrophysics
Astronomy
47
Scientific paper
We have observed 26 giant stars in the Sextans dwarf spheroidal (dSph) galaxy and obtained high-quality spectra for 21 of these. We have multi- epoch spectra for nine stars from which two possible binary stars have been found. The velocity dispersion of the sample calculated by a maximum likelihood method is 7.0^+1.3^_-1.0_ km s^-1^ and the mean velocity is 224.4+/-1.6 km s^-1^. There is no sign of rotation about any axis within the errors of the measurements, the formally derived value around the minor axis being 0.4 km s^-1^ at 300 pc from the axis. It is possible that binary stars may be making a significant contribution to the velocity distribution or that Sextans may be being tidally disrupted. If further work eliminates both these possibilities then, assuming isotropy in the velocity dispersion and dynamical equilibrium, the core mass-to- light ratio is 124^+85^_-60_ M_sun_/L_sun and the total mass-to-light ratio is 121^+84^_-58_ M_sun_/L_sun_, implying the presence of large quantities of dark matter.
Carter David
Gilmore Gerard
Hargreaves J. C.
Irwin Mary Jane
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