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The Sagittarius dwarf mass-to-light ratio

Published online by Cambridge University Press:  08 November 2005

S. Zaggia ,
P. Bonifacio ,
M. Bellazzini ,
E. Caffau ,
F. Ferraro ,
G. Marconi ,
L. Monaco ,
S. Monai  and
L. Sbordone
S. Zaggia
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Trieste email: zaggia@ts.astro.it
P. Bonifacio
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Trieste email: zaggia@ts.astro.it
M. Bellazzini
Affiliation:
INAF – Osservatorio Astronomico di Bologna
E. Caffau
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Trieste email: zaggia@ts.astro.it
F. Ferraro
Affiliation:
Dipartimento di Astronomia, Università di Bologna
G. Marconi
Affiliation:
European Southern Observatory, Santiago
L. Monaco
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Trieste email: zaggia@ts.astro.it European Southern Observatory, Santiago
S. Monai
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Trieste email: zaggia@ts.astro.it
L. Sbordone
Affiliation:
European Southern Observatory, Santiago
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Abstract

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We report on the use of high-resolution spectra to obtain a detailed description of the Sagittarius dwarf spheroidal internal dynamics, its Mass and Mass to Light ratio (M/L). Our direct measure of the central velocity dispersion of SGR give $\sigma_{SGR}=8.1\pm0.4$ km/s which translates in a total mass estimate of $M_{SGR} =1.6\times10^8 M_{\odot}$ and corresponding $(M/L)_{SGR}=9.1 (M/L)_{\odot}$. We also report on a possible detection of rotation in the core of SGR.

Keywords

dwarf galaxies—kinematics—mass
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 101 - 104
Copyright
© 2005 International Astronomical Union