The Distribution and the Projected Density of Stars around a Black Hole in the Centre of a Globular Cluster
One of the astrophysical topics of great interest is the black hole. Already two middle mass (~ 1 M⊙) black holes, in Cygnus and Vela, are well established. For example the compact X-ray source in Cyganus has a lower mass limit of about 5⊙. Now the upper mass-limits for compact stars are well below this value: (i) the Chandrasekhar limit for white dwarfs and cold neutron stars ~ 1.4 M⊙; (ii) the Oppenbeimer-Volkoff limit for hot neutron stars with no other interactions considered ~ 2.2 M⊙; and (iii) the Fang-Ruffini limit for neutron stars under the most general conditionsu ~ 3.2 M⊙. Thus Cygnus Xl is probably a black hole*.
KeywordsBlack Hole Neutron Star Globular Cluster Compact Star Particle Number Density
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