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The radial velocity, velocity dispersion, and mass-to-light ratio of the Sculptor dwarf galaxyThe radial velocity, velocity dispersion, and mass-to-light ratio for 16 K giants in the Sculptor dwarf galaxy are calculated. Spectra at the Ca II triplet are analyzed using cross-correlation techniques in order to obtain the mean velocity of + 107.4 + or - 2.0 km/s. The dimensional velocity dispersion estimated as 6.3 (+1.1, -1.3) km/s is combined with the calculated core radius and observed central surface brightness to produce a mass-to-light ratio of 6.0 in solar units. It is noted that the data indicate that the Sculptor contains a large amount of mass not found in globular clusters, and the mass is either in the form of remnant stars or low-mass dwarfs.
Document ID
19870031859
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Armandroff, T. E.
(Yale Univ. Observatory New Haven, CT, United States)
Da Costa, G. S.
(Yale University Observatory, New Haven, CT, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: Astronomical Journal
Volume: 92
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
87A19133
Funding Number(s)
CONTRACT_GRANT: NAGW-778
Distribution Limits
Public
Copyright
Other

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