Speaker
Dr
Atrideb Chatterjee
(Kapteyn Astronomical Institute, University of Groningen)
Description
The 21-cm global signal, a treasure trove of information about the nature of the first luminous sources of the Universe, has traditionally been modelled assuming that these early sources were predominantly star-forming galaxies. However, recent observations by the James Webb Space Telescope (JWST) have revealed several AGNs as early as z ~ 10 - 10.4 . In light of this, it is important to investigate the contribution of such AGNs to the 21-cm signal. Assuming that these AGNs are seeded by Primordial Black Holes (PBHs) and employing an analytical PBH model, consistent with existing cosmological and astrophysical constraints, I will discuss how these exotic objects can affect the redshift evolution of the global signal.
| Other topic / keywords: | Primordial Black Hole |
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Author
Dr
Atrideb Chatterjee
(Kapteyn Astronomical Institute, University of Groningen)