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

Published online by Cambridge University Press:  08 May 2018

Girish Kulkarni Open the ORCID record for Girish Kulkarni [Opens in a new window] ,
Tirthankar Roy Choudhury ,
Ewald Puchwein  and
Martin G. Haehnelt
Girish Kulkarni
Affiliation:
Institute of Astronomy and Kavli Institute of Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK email: kulkarni@ast.cam.ac.uk
Tirthankar Roy Choudhury
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune 411007, India
Ewald Puchwein
Affiliation:
Institute of Astronomy and Kavli Institute of Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Martin G. Haehnelt
Affiliation:
Institute of Astronomy and Kavli Institute of Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
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Abstract

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We 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 Lyα and CMB data. We model AGN by extrapolating the observed Mbh–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 mK2 at scales accessible to experiments (k ≲ 1 cMpc−1h). 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.

Keywords

dark agesreionizationfirst stars – galaxies: active – galaxies: high-redshift – galaxies: quasars – intergalactic medium
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 246 - 249
Copyright
Copyright © International Astronomical Union 2018 

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