Ev. Derishev et Aa. Belyanin, Prospects for detection of primordial black holes captured in cold dark matter haloes around massive objects, ASTRON ASTR, 343(1), 1999, pp. 1-9
The capture of cold dark matter species, and especially primordial black ho
les, during the formation of gravitationally bound objects is analyzed. It
is shown that the best conditions for an efficient gravitational capture we
re at the epoch preceding the galaxy formation, when the first astrophysica
l objects with masses of the order of Jeans mass 10(5)-10(6) M-. were formi
ng. Black hole haloes around old globular clusters, dark matter clusters an
d Population III stars are considered, and in each case the total mass of t
he halo and its luminosity due to the Hawking emission are found. Among all
the objects considered, large (M greater than or similar to 10(5) M-.), ne
arby (within similar to 5 kpc from the Sun) globular clusters are shown to
provide the best prospects for detection of the black holes. First, black h
ole haloes around the globular clusters have the highest brightness near 10
0 MeV, which is within the reach of EGRET capabilities, and provide distinc
t observational features. Second, globular clusters are extensively studied
at other wavelengths and represent a well-defined target for gamma-ray det
ectors. We have also considered the probability of detecting an isolated bl
ack hole bound to the Sun. Our estimates of the mass of gravitationally cap
tured haloes are applicable to any cold dark matter particles.