Nature and distribution of dark matter. I - Dwarf spheroidals and Milky Way

Details Nature and distribution of dark matter. I - Dwarf spheroidals and Milky Way Nature and distribution of dark matter. I - Dwarf spheroidals and Milky Way

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985japa....6..261p&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 6, Dec. 1985, p. 261-277.

Astronomy and Astrophysics

Astrophysics

3

Galactic Structure, Mass Distribution, Missing Mass (Astrophysics), Spatial Distribution, Dwarf Galaxies, Milky Way Galaxy, Neutrinos, Spheroids

Scientific paper

It is argued that observations on the Milky Way and dwarf spheroidals imply the existence of individual halos around dwarf spheroidals. If neutrinos (or any other 'hot' particle) provide the dark matter then it is shown that: (1) embedding of visible matter inside large (few Mpc) dark matter islands is observationally untenable; (2) dwarf speroidals possess dark matter halos of about 10 kpc radius around them, and have an (M/L) ratio of about 10,000; and (3) the halos of spiral galaxies (e.g., the Milky Way) extend to about 100 kpc in radius. If 'cold' dark matter makes up the halos, then no significant constraints are obtained. The effect of these constraints on larger scales is briefly discussed.

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