Simulating the 21 cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs

Ciardi, B., Inoue, S., Abdalla, F.B., Asad, K., Bernardi, G., Bolton, James S., Brentjens, M., de Bruyn, A.G., Chapman, E., Daiboo, S., Fernandez, E.R., Ghosh, A., Graziani, L., Harker, G.J.A., Iliev, I.T., Jelic, V., Jensen, H., Kazemi, S., Koopmans, L.V.E., Martinez, O., Maselli, A., Mellema, G., Offringa, A.R., Pandey, V.N., Schaye, Joop, Thomas, R., Vedantham, H., Yatawatta, S. and Zaroubi, S. (2015) Simulating the 21 cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs. Monthly Notices of the Royal Astronomical Society, 453 (1). pp. 101-105. ISSN 1365-2966

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We investigate the feasibility of detecting 21 cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of cosmic reionization, together with estimates of the GRB radio afterglow flux and the instrumental characteristics of the LOw Frequency ARray (LOFAR). We find that absorption features could be marginally (with a S/N larger than a few) detected by LOFAR at z ≳ 7 if the GRB is a highly energetic event originating from Pop III stars, while the detection would be easier if the noise were reduced by one order of magnitude, i.e. similar to what is expected for the first phase of the Square Kilometre Array (SKA1-low). On the other hand, more standard GRBs are too dim to be detected even with ten times the sensitivity of SKA1-low, and only in the most optimistic case can a S/N larger than a few be reached at z ≳ 9.

Item Type: Article
Additional Information: © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
Keywords: gamma-ray burst: general, dark ages, reionization, first stars, radio lines: general
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number:
Depositing User: Bolton, James
Date Deposited: 04 May 2017 13:43
Last Modified: 04 May 2020 17:15

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