Detecting the 21 cm forest in the 21 cm power spectrum
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Author(s)
Ewall-Wice, Aaron Michael
Dillon, Joshua Shane
Mesinger, A.
Hewitt, Jacqueline N
Date Issued
May 2014
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Citation
Ewall-Wice, A. et al.“Detecting the 21 Cm Forest in the 21 Cm Power Spectrum.” Monthly Notices of the Royal Astronomical Society 441, 3 (May 2014): 2476–2496 © 2014 The Authors
Version
Author's final manuscript
Abstract
We describe a new technique for constraining the radio-loud population of active galactic nuclei at high redshift by measuring the imprint of 21 cm spectral absorption features (the 21 cm forest) on the 21 cm power spectrum. Using semi-numerical simulations of the intergalactic medium and a semi-empirical source population, we show that the 21 cm forest dominates a distinctive region of k-space, k ≲ 0.5Mpc⁻¹. By simulating foregrounds and noise for current and potential radio arrays, we find that a next-generation instrument with a collecting area of the order of ∼0.1km² (such as the Hydrogen Epoch of Reionization Array) may separately constrain the X-ray heating history at large spatial scales and radio-loud active galactic nuclei of the model we study at small ones. We extrapolate our detectability predictions for a single radio-loud active galactic nuclei population to arbitrary source scenarios by analytically relating the 21 cm forest power spectrum to the optical depth power spectrum and an integral over the radio luminosity function. Keywords: early Universe; radio continuum:galaxies; X-rays:galaxies
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1093/MNRAS/STU666
