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Reverse shocks in the relativistic outflows of gravitational wave-detected neutron star binary mergers

Lamb, GP and Kobayashi, S (2019) Reverse shocks in the relativistic outflows of gravitational wave-detected neutron star binary mergers. Monthly Notices of the Royal Astronomical Society, 489 (2). pp. 1820-1827. ISSN 0035-8711

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Abstract

The afterglows to gamma-ray bursts (GRBs) are due to synchrotron emission from shocks generated as an ultrarelativistic outflow decelerates. A forward and a reverse shock will form, however, where emission from the forward shock is well studied as a potential counterpart to gravitational wave-detected neutron star mergers the reverse shock has been neglected. Here, we show how the reverse shock contributes to the afterglow from an off-axis and structured outflow. The off-axis reverse shock will appear as a brightening feature in the rising afterglow at radio frequencies. For bursts at ∼100 Mpc, the system should be inclined ≲20° for the reverse shock to be observable at ∼0.1–10 d post-merger. For structured outflows, enhancement of the reverse shock emission by a strong magnetic field within the outflow is required for the emission to dominate the afterglow at early times. Early radio photometry of the afterglow could reveal the presence of a strong magnetic field associated with the central engine.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 07 Nov 2019 11:59
Last Modified: 07 Nov 2019 12:00
DOI or Identification number: 10.1093/mnras/stz2252
URI: http://researchonline.ljmu.ac.uk/id/eprint/11718

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