Can galactic halos be made of baryons?

Details Can galactic halos be made of baryons? Can galactic halos be made of baryons?

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phlb..126...28h&link_type=abstract

Physics Letters B, Volume 126, Issue 1-2, p. 28-32.

Physics

46

Scientific paper

Several arguments are presented indicating that the apparently non-luminous matter forming massive halos of spiral galaxies is not baryonic. There are difficulties with a halo dominated by gas, snowballs, dust and rocks, jupiters, low mass stars, dead stars and neutron stars. Also, halos may not be composed of black holes unless they are either extremely efficiently accreting or primordial. Consequently, it appears that a significant fraction of the universe may be in the form of massive neutrinos, gravitinos, monopoles, etc.

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