Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-12T19:45:52.415Z Has data issue: false hasContentIssue false
  • English
  • Français

The Search for Dark Matter in Draco and Ursa Minor: A Three Year Progress Report

Published online by Cambridge University Press:  04 August 2017

M. Aaronson  and
E. Olszewski
M. Aaronson
Affiliation:
Steward Observatory, University of Arizona, Tucson, Arizona 85721 U.S.A.
E. Olszewski
Affiliation:
Steward Observatory, University of Arizona, Tucson, Arizona 85721 U.S.A.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We report the cumulative results of an on-going effort to measure the stellar velocity dispersion in two nearby dwarf spheroidal galaxies. Radial velocities having an accuracy ≲ 2 km s−1 have now been secured for ten stars in Ursa Minor and eleven stars in Draco (including 16 K giants and 5 C types). Most objects have been observed at two or more epochs. Stars having non-variable velocities yield in both dwarfs a large (∼ 10 km s−1) dispersion. These results cannot be explained by atmospheric motions, and circumstantial evidence suggests that the effects of undetected binaries are also not likely to be important. Instead, it seems that both spheroidals contain a substantial dark matter component, which therefore must be “cold” in form.

Type
Review Paper
Information
Symposium - International Astronomical Union , Volume 117: Dark Matter in the Universe , 1987 , pp. 153 - 160
Copyright
Copyright © Reidel 1987 

References

Aaronson, M. 1983, Ap. J. (Letters), 266, L11.Google Scholar
Aaronson, M. 1985, in Star Forming Dwarf Galaxies and Related Objects, ed. Kunth, D. and Thuan, T. X., in press.Google Scholar
Aaronson, M., Liebert, J., and Stocke, J. 1982, Ap. J., 254, 507.Google Scholar
Aaronson, M., and Mould, J. 1985, Ap. J., 290, 191.Google Scholar
Carney, B., and Latham, D. 1985, private communication.Google Scholar
Dekel, A., and Silk, J. 1985, preprint.Google Scholar
Iben, I. 1975, Ap. J., 196, 525.CrossRefGoogle Scholar
Illingworth, G. 1976, Ap. J., 204, 73.Google Scholar
Kormendy, J. 1986, in IAU Symposium No. 117, Dark Matter in the Universe, ed. Kormendy, J. and Knapp, J., (this volume).CrossRefGoogle Scholar
Lin, D. N. C., and Faber, S. M. 1983, Ap. J. (Letters), 266, L21.CrossRefGoogle Scholar
Mathieu, R. D. 1983, , University of California, Berkeley.Google Scholar
Mayor, M., et al. 1984, Astr. Ap., 134, 118.Google Scholar
McClure, R. D., 1984, Ap. J. (Letters), 280, L31.Google Scholar
Sargent, W. L. W. 1985, in Star Forming Dwarf Galaxies and Related Objects, ed. Kunth, D. and Thuan, T. X., in press.Google Scholar
Tinsley, B. M. 1981, M.N.R.A.S., 194, 63.Google Scholar
Tremaine, S., and Gunn, J. E. 1979, Phys. Rev. Letters, 42, 407.Google Scholar