A Radial Velocity Dispersion Profile for the Fornax Dwarf Spheroidal Galaxy

Details A Radial Velocity Dispersion Profile for the Fornax Dwarf Spheroidal Galaxy A Radial Velocity Dispersion Profile for the Fornax Dwarf Spheroidal Galaxy

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..220..367w&link_type=abstract

International Astronomical Union Symposium no. 220, held 21 - 25 July, 2003 in Sydney, Australia. Eds: S. D. Ryder, D. J. Pisano

Astronomy and Astrophysics

Astronomy

Scientific paper

We have measured precise (± 3 km/s) radial velocities for 180 stars in the Fornax dwarf spheroidal galaxy, spanning the region R=0 to just beyond the nominal tidal radius. We perform a ``classical'' analysis of the resulting velocity dispersion profile. A mass-follows-light King model is ruled out, while a constant velocity dispersion model remains a good fit out to the limits of our dataset. For the constant velocity dispersion case, we calculate a velocity dispersion of 11.1 ± 0.7 km/s, which implies a central M/L/[M/L]&sun; ratio of 7.6 ± 1.0.

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