Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..354r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 354-361. Research supported by Ambrose Monell Founda
Astronomy and Astrophysics
Astronomy
24
Baryons, Dark Matter, Halos, Local Group (Astronomy), Milky Way Galaxy, Andromeda Galaxy, Faint Objects, Metallicity, Spiral Galaxies
Scientific paper
A four-color method and deep CCD data are used to search for very faint metal-poor stars in the direction of the south Galactic pole. The results make it possible to limit the contribution of ordinary old, metal-poor stars to the dynamical halo of the Galaxy or to the Local Group. The ratio of the mass of the halo to its ordinary starlight must be more than about 2000, unless the halo is very small. For the Local Group, this ratio is greater than about 400. If this local dark matter is baryonic, the process of compact-object formation must produce very few 'impurities' in the form of stars similar to those found in globular clusters. The expected number of unbound stars with MV not greater than 6 within 100 pc of the sun is less than 1 based on the present 90-percent upper limit to the Local Group starlight.
Flynn Chris
Gould Andrew
Guhathakurta Puragra
Richstone Douglas
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