Signatures of primordial black holes as seeds of supermassive black holes
Abstract
It is broadly accepted that Supermassive Black Holes (SMBHs) are located in the centers of most massive galaxies, although there is still no convincing scenario for the origin of their massive seeds. It has been suggested that primordial black holes (PBHs) of masses ≳ 10^{2} M_⊙ may provide such seeds, which would grow to become SMBHs. We suggest an observational test to constrain this hypothesis: gas accretion around PBHs during the cosmic dark ages powers the emission of high energy photons which would modify the spin temperature as measured by 21cm Intensity Mapping (IM) observations. We model and compute their contribution to the standard sky-averaged signal and power spectrum of 21cm IM, accounting for its substructure and angular dependence for the first time. While SKA could provide a detection, only a more ambitious experiment would provide accurate measurements.
- Publication:
-
Highlights on Spanish Astrophysics X
- Pub Date:
- March 2019
- Bibcode:
- 2019hsax.conf...98B