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  Fast radio bursts: the last sign of supramassive neutron stars

Falcke, H., & Rezzolla, L. (2014). Fast radio bursts: the last sign of supramassive neutron stars. Astronomy and Astrophysics, 562: A137. doi:10.1051/0004-6361/201321996.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0065-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0066-C
Genre: Journal Article

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 Creators:
Falcke, Heino1, Author
Rezzolla, Luciano2, Author              
Affiliations:
1Radboud University Nijmegen ASTRON MPIfR Bonn, ou_persistent22              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Several fast radio bursts have been discovered recently, showing a bright, highly dispersed millisecond radio pulse. The pulses do not repeat and are not associated with a known pulsar or gamma-ray burst. The high dispersion suggests sources at cosmological distances, hence implying an extremely high radio luminosity, far larger than the power of single pulses from a pulsar. We suggest that a fast radio burst represents the final signal of a supramassive rotating neutron star that collapses to a black hole due to magnetic braking. The neutron star is initially above the critical mass for non-rotating models and is supported by rapid rotation. As magnetic braking constantly reduces the spin, the neutron star will suddenly collapse to a black hole several thousand to million years after its birth. We discuss several formation scenarios for supramassive neutron stars and estimate the possible observational signatures {making use of the results of recent numerical general-relativistic calculations. While the collapse will hide the stellar surface behind an event horizon, the magnetic-field lines will snap violently. This can turn an almost ordinary pulsar into a bright radio "blitzar": Accelerated electrons from the travelling magnetic shock dissipate a significant fraction of the magnetosphere and produce a massive radio burst that is observable out to z>0.7. Only a few percent of the neutron stars needs to be supramassive in order to explain the observed rate. We suggest that fast radio bursts might trace the solitary formation of stellar mass black holes at high redshifts. These bursts could be an electromagnetic complement to gravitational-wave emission and reveal a new formation and evolutionary channel for black holes that are not seen as gamma-ray bursts. Radio observations of these bursts could trace the core-collapse supernova rate throughout the universe.

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 Dates: 2013-07-042014-01-212014
 Publication Status: Published in print
 Pages: Astronomy & Astrophysics, in press - 6 pages, 1 figure, revised after referee comments, slightly expanded, corrected numerical error in eq. 3, normalization of parameter f changed, abstract abridged
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 Identifiers: arXiv: 1307.1409
DOI: 10.1051/0004-6361/201321996
URI: http://arxiv.org/abs/1307.1409
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 562 Sequence Number: A137 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: /journals/resource/954922828219_1