TY - JOUR
T1 - Can galactic halos be made of baryons?
AU - J. Hegyi, Dennis
AU - A. Olive, Keith
PY - 1983/6/23
Y1 - 1983/6/23
N2 - 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.
AB - 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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U2 - 10.1016/0370-2693(83)90009-6
DO - 10.1016/0370-2693(83)90009-6
M3 - Article
AN - SCOPUS:33847795095
SN - 0370-2693
VL - 126
SP - 28
EP - 32
JO - Physics Letters B
JF - Physics Letters B
IS - 1-2
ER -