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Evolution of the Quasar Luminosity Function: Implications for EoR-21cm

Accepted version
Peer-reviewed

Type

Article

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Authors

Kulkarni, G 
Choudhury, TR 
Puchwein, E 
Haehnelt, MG 

Abstract

jats:titleAbstract</jats:title>jats:pWe present predictions for the spatial distribution of 21 cm brightness temperature fluctuations from high-dynamic-range simulations for AGN-dominated reionization histories that have been tested against available jats:italicLyα</jats:italic> and CMB data. We model AGN by extrapolating the observed Mjats:subbh</jats:sub>–σ relation to high redshifts and assign them ionizing emissivities consistent with recent UV luminosity function measurements. AGN-dominated reionization histories increase the variance of the 21 cm emission by a factor of up to ten compared to similar reionization histories dominated by faint galaxies, to values close to 100 mKjats:sup2</jats:sup> at scales accessible to experiments (jats:italick</jats:italic> ≲ 1 cMpcjats:sup−1</jats:sup>jats:italich</jats:italic>). This is lower than the sensitivity reached by ongoing experiments by only a factor of about two or less. AGN dominated reionization should be easily detectable by LOFAR (and later HERA and SKA1) at their design sensitivity.</jats:p>

Description

Keywords

dark ages, reionization, first stars, galaxies: active, galaxies: high-redshift, galaxies: quasars, intergalactic medium

Journal Title

Proceedings of the International Astronomical Union

Conference Name

Journal ISSN

1743-9213
1743-9221

Volume Title

12

Publisher

Cambridge University Press (CUP)
Sponsorship
Science and Technology Facilities Council (ST/M007065/1)