Observational manifestations of "cosmological dinosaurs'' at redshifts $z\sim 20$

Abstract

We consider a primordial black hole of very high mass, $10^9-10^{10}{M}_{\odot }$, surrounded by dark matter and barionic halo at redshifts $z\sim 20$ 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 hardware and methodological aspects of the search for such objects are discussed.

9 pages, 10 figures

References in corpus (5)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Cosmic microwave background bounds on primordial black holes including dark matter halo accretion
• Onset of Cosmic Reionization: Evidence of An Ionized Bubble Merely 680 Myrs after the Big Bang
• Why the mean mass of primordial black hole distribution is close to 10$M_{\odot }$
• SKA1-LOW Antenna Design Document

Cited by in corpus (2)

• The Metron Project -- I. The Metron Project Science Program
• Observational Manifestations of Primordial Objects in the Early Universe Through the Hydrogen Subordinate Lines