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Short gamma-ray bursts in old populations: magnetars from white dwarf-white dwarf mergers

Levan, Andrew ; Wynn, GA ; Chapman, R ; Davies, Melvyn B LU ; King, AR ; Priddey, RS and Tanvir, NR (2006) In Monthly Notices of the Royal Astronomical Society 368(1). p.1-5
Abstract
Recent progress on the nature of short-duration gamma-ray bursts has shown that a fraction of them originate in the local Universe. These systems may well be the result of giant flares from soft gamma-repeaters (highly magnetized neutron stars commonly known as magnetars). However, if these neutron stars are formed via the core collapse of massive stars then it would be expected that the bursts should originate from predominantly young stellar populations, while correlating the positions of BATSE short bursts with structure in the local Universe reveals a correlation with all galaxy types, including those with little or no ongoing star formation. This is a natural outcome if, in addition to magnetars formed via the core collapse of massive... (More)
Recent progress on the nature of short-duration gamma-ray bursts has shown that a fraction of them originate in the local Universe. These systems may well be the result of giant flares from soft gamma-repeaters (highly magnetized neutron stars commonly known as magnetars). However, if these neutron stars are formed via the core collapse of massive stars then it would be expected that the bursts should originate from predominantly young stellar populations, while correlating the positions of BATSE short bursts with structure in the local Universe reveals a correlation with all galaxy types, including those with little or no ongoing star formation. This is a natural outcome if, in addition to magnetars formed via the core collapse of massive stars, they also form via accretion-induced collapse following the merger of two white dwarfs, one of which is magnetic. We investigate this possibility and find that the rate of magnetar production via white dwarf-white dwarf (WD-WD) mergers in the Milky Way is comparable to the rate of production via core collapse. However, while the rate of production of magnetars by core collapse is proportional to the star formation rate, the rate of production via WD-WD mergers (which have long lifetimes) is proportional to the stellar mass density, which is concentrated in early-type systems. Therefore magnetars produced via WD-WD mergers may produce soft gamma-repeater giant flares which can be identified with early-type galaxies. We also comment on the possibility that this mechanism could produce a fraction of the observed short-duration burst population at higher redshift. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
white dwarfs, gamma-rays : bursts
in
Monthly Notices of the Royal Astronomical Society
volume
368
issue
1
pages
1 - 5
publisher
Oxford University Press
external identifiers
  • wos:000236797600001
  • scopus:33748803762
ISSN
1365-2966
DOI
10.1111/j.1745-3933.2006.00144.x
language
English
LU publication?
yes
id
d133de9c-00e2-4a79-923f-0597f922d434 (old id 413950)
date added to LUP
2016-04-01 11:45:12
date last changed
2020-11-22 04:23:27
@article{d133de9c-00e2-4a79-923f-0597f922d434,
  abstract     = {Recent progress on the nature of short-duration gamma-ray bursts has shown that a fraction of them originate in the local Universe. These systems may well be the result of giant flares from soft gamma-repeaters (highly magnetized neutron stars commonly known as magnetars). However, if these neutron stars are formed via the core collapse of massive stars then it would be expected that the bursts should originate from predominantly young stellar populations, while correlating the positions of BATSE short bursts with structure in the local Universe reveals a correlation with all galaxy types, including those with little or no ongoing star formation. This is a natural outcome if, in addition to magnetars formed via the core collapse of massive stars, they also form via accretion-induced collapse following the merger of two white dwarfs, one of which is magnetic. We investigate this possibility and find that the rate of magnetar production via white dwarf-white dwarf (WD-WD) mergers in the Milky Way is comparable to the rate of production via core collapse. However, while the rate of production of magnetars by core collapse is proportional to the star formation rate, the rate of production via WD-WD mergers (which have long lifetimes) is proportional to the stellar mass density, which is concentrated in early-type systems. Therefore magnetars produced via WD-WD mergers may produce soft gamma-repeater giant flares which can be identified with early-type galaxies. We also comment on the possibility that this mechanism could produce a fraction of the observed short-duration burst population at higher redshift.},
  author       = {Levan, Andrew and Wynn, GA and Chapman, R and Davies, Melvyn B and King, AR and Priddey, RS and Tanvir, NR},
  issn         = {1365-2966},
  language     = {eng},
  number       = {1},
  pages        = {1--5},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Short gamma-ray bursts in old populations: magnetars from white dwarf-white dwarf mergers},
  url          = {http://dx.doi.org/10.1111/j.1745-3933.2006.00144.x},
  doi          = {10.1111/j.1745-3933.2006.00144.x},
  volume       = {368},
  year         = {2006},
}