Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 441, Issue 3, Pages 2476-2496Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu666
Keywords
early Universe; radio continuum: galaxies; X-rays: galaxies
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Funding
- Massachusetts Institute of Technology School of Science
- National Science Foundation Graduate Research Fellowship [1122374]
- Bruno Rossi Fellowship
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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 a parts per thousand(3) 0.5 Mpc(- 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 similar to 0.1 km(2) (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.
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