Search for isolated Galactic Centre stellar mass black holes in the IR and sub-mm range

Abstract

We investigate a possibility to find an accreting isolated black hole (IBH) with mass 1 − 100M within Central Galactic Molecular Zone (CMZ) in the submillimetre and IR spectral range with help of planned space observatories James Webb Space Telescope (JWST) and Millimetron (MM). We assume the spherical mode of accretion. We develop the simplest possible quantitative model of the formation of radiation spectrum in this range due to synchrotron emission and show that it fully agrees with the more complicated model of Ipser and Price 1982 for expected values of accretion rate.If a substantial fraction of LIGO events was caused by merger of primordial black holes, the JWST would be able to find them provided that there is a cusp in distribution of dark matter in the Galaxy and that the accretion efficiency parameter λ defined as the ratio of accretion rate onto IBH to its Bondi-Hoyle-Lyttleton value is larger than ∼ 10 −2 . A comparable amount of IBHs is also predicted by recent models of their formation due to stellar evolution. MM capabilities are hampered by the effect of confusion due to distant submillimetre galaxies, but it can also be used for such purposes if the confusion effect is properly dealt with. In case of efficient accretion with λ ∼ 1, both instruments could detect IBHs even when their number densities are as low as 10 −6 pc −3 .

Peculiar objects in the birthplaces of radio pulsars -- stellar-mass black hole candidates

“…These areas host 35 optical objects from the SDSS 6 , DSS 7 , CDS 8 databases. Thus, a sample was formed for further study, consisting of 94 optical objects, 59 of which were selected by color, and 35 by the coordinate uncertainties of the X-ray sources.…”

“…Model computations [24,46] taking into account the distribution of masses and velocities, as well as the interstellar medium in the solar vicinity have shown that searching for BHs in the radio range is even more feasible, considering the sensitivity of the current and future projects, such as the Square Kilometer Array (SKA), which will be able to detect radio waves from nearby BHs. [35] have shown the possibility of searching for isolated stellar-mass BHs in the central molecular zone of the Galaxy in the sub-millimeter and infrared spectral regions using space observatories. It thus follows from the aforementioned that detecting BHs is possible by observing the manifestations of their interaction with the surrounding medium.…”

On the Possibility of Direct Detection of the Emission of Microlens MOA-2011-BLG-191/OGLE-2011-BLG-0462—a Probable Black Hole

“…Model computations of [25,26] have shown that searching for BHs in the radio is even more feasible considering the sensitivity of such projects as SKA. The prospects of searching for isolated BHs in the central molecular zone of the Galaxy in the sub-millimeter and infrared spectral regions by means of space observatories are discussed in [27].…”