TY - JOUR

T1 - Observational manifestation of cosmological dinozaurs at redshifts z=20

AU - Dubrovich, V. K.

AU - Eroshenko, Yu. N.

AU - Grachev, S. I.

N1 - V K Dubrovich, Yu N Eroshenko, S I Grachev, Observational manifestations of ‘cosmological dinosaurs’ at redshifts z ∼ 20, Monthly Notices of the Royal Astronomical Society, Volume 503, Issue 2, May 2021, Pages 3081–3088, https://doi.org/10.1093/mnras/stab689

PY - 2021

Y1 - 2021

N2 - We consider a primordial black hole of very high mass, 109−1010M⊙ , surrounded by the dark matter and bayonic halo at redshifts z ∼ 20 without any local sources of energy release. Such heavy and concentrated objects in the early Universe were previously called ‘cosmological dinosaurs’. Spectral distribution and spatial variation of the brightness in the 21-cm line of atomic hydrogen are calculated with the theory of radiation transfer. It is shown that a narrow and deep absorption arises in the form of the spherical shell around the primordial black hole at the certain radius. The parameters of this shell depend almost exclusively on the mass of the black hole. The angular diameter 18 arcsec of the absorption ring at z ∼ 20 is well within the current technical possibilities of the Square Kilometre Array type telescopes. But the observation of the ring width itself requires an order of magnitude better resolution.

AB - We consider a primordial black hole of very high mass, 109−1010M⊙ , surrounded by the dark matter and bayonic halo at redshifts z ∼ 20 without any local sources of energy release. Such heavy and concentrated objects in the early Universe were previously called ‘cosmological dinosaurs’. Spectral distribution and spatial variation of the brightness in the 21-cm line of atomic hydrogen are calculated with the theory of radiation transfer. It is shown that a narrow and deep absorption arises in the form of the spherical shell around the primordial black hole at the certain radius. The parameters of this shell depend almost exclusively on the mass of the black hole. The angular diameter 18 arcsec of the absorption ring at z ∼ 20 is well within the current technical possibilities of the Square Kilometre Array type telescopes. But the observation of the ring width itself requires an order of magnitude better resolution.

UR - https://ieeexplore.ieee.org/document/9480901

UR - https://academic.oup.com/mnras/article/503/2/3081/6166768

M3 - Article

VL - 503

SP - 3081

EP - 3088

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -