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Explaining the Statistical Properties of Fast Radio Bursts with Suppressed Low-frequency Emission

Ravi, Vikram and Loeb, Abraham (2019) Explaining the Statistical Properties of Fast Radio Bursts with Suppressed Low-frequency Emission. Astrophysical Journal, 874 (1). Art. No. 72. ISSN 1538-4357. doi:10.3847/1538-4357/ab0748.

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The possibility of fast radio burst (FRB) emission being suppressed at low frequencies, resulting in a cutoff of the average rest-frame spectrum, has been raised as an explanation for the lack of detections at meter wavelengths. We examine propagation effects that could cause this suppression, and find that a low-frequency spectral cutoff may be generic regardless of the specific FRB emission mechanism. We then illustrate the effects of a low-frequency spectral cutoff on the statistics of FRBs, given a cosmological source population. The observed FRB rate peaks at a specific frequency under a variety of assumptions. Observations at lower frequencies are more sensitive to high-redshift events than observations above the maximal-rate frequency, and therefore result in more sharply broken fluence distributions. Our results suggest that the absence of low-frequency FRBs, and the differences between the Parkes and the Australian Square Kilometre Array FRB samples, can be fully explained by suppressed low-frequency FRB emission.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ravi, Vikram0000-0002-7252-5485
Loeb, Abraham0000-0003-4330-287X
Additional Information:© 2019 The American Astronomical Society. Received 2018 October 31; revised 2019 February 10; accepted 2019 February 13; published 2019 March 26. V.R. thanks R. Blandford for raising the possibility of stimulated Raman scattering in FRB plasma environments. This work was supported in part by grants from the Breakthrough Prize Foundation and the black hole Initiative through the John Templeton Foundation.
Funding AgencyGrant Number
Breakthrough Prize FoundationUNSPECIFIED
John Templeton FoundationUNSPECIFIED
Subject Keywords:methods: statistical – opacity – plasmas – radiative transfer – radio continuum: general
Issue or Number:1
Record Number:CaltechAUTHORS:20190326-092540757
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Official Citation:Vikram Ravi and Abraham Loeb 2019 ApJ 874 72
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94140
Deposited By: Tony Diaz
Deposited On:26 Mar 2019 16:55
Last Modified:16 Nov 2021 17:03

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