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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| The radial velocity, velocity dispersion, and mass-to-light ratio of the Sculptor dwarf galaxy
Radial velocities for 16 K giants in the Sculptor dwarf spheroidalgalaxy are presented. The velocities have been determined viacross-correlation techniques from spectra obtained at the calciuminfrared triplet. They have a single-observation accuracy of 4.7 km/s.The mean velocity of the Sculptor stars is +107.4±2.0 km/s, avalue that supports the adoption of a large mass for the Galaxy. Theone-dimensional velocity dispersion of this sample is 6.3 (+1.1, -1.3)km/s, a value which, when combined with a new estimate of the coreradius of the galaxy and the observed central surface brightness, yieldsa visual mass-to-light ratio of 6.0 in solar units. This value is morethan twice current estimates of global mass-to-light ratios of globularclusters, and thus, if interpreted literally, indicates that Sculptorcontains a substantial amount of additional mass not found in globularclusters.
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