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Fallback accretion on to a newborn magnetar : long GRBs with giant X-ray flares
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Gibson, S. L., Wynn, G. A., Gompertz, Benjamin P. and O’Brien, P. T. (2018) Fallback accretion on to a newborn magnetar : long GRBs with giant X-ray flares. Monthly Notices of the Royal Astronomical Society, 478 (4). pp. 4323-4335. doi:10.1093/mnras/sty1363
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WRAP-fallback-accretion-newborn-magnetar-long-GRBs-giant-X-ray-flares-Gompertz-2018.pdf - Accepted Version - Requires a PDF viewer. Download (2596Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/sty1363
Abstract
Flares in the X-ray afterglow of gamma-ray bursts (GRBs) share more characteristics with the prompt emission than the afterglow, such as pulse profile and contained fluence. As a result, they are believed to originate from late-time activity of the central engine and can be used to constrain the overall energy budget. In this paper, we collect a sample of 19 long GRBs observed by Swift-XRT that contain giant flares in their X-ray afterglows. We fit this sample with a version of the magnetar propeller model, modified to include fallback accretion. This model has already successfully reproduced extended emission in short GRBs. Our best fits provide a reasonable morphological match to the light curves. However, 16 out of 19 of the fits require efficiencies for the propeller mechanism that approach 100%. The high efficiency parameters are a direct result of the high energy contained in the flares and the extreme duration of the dipole component, which forces either slow spin periods or low magnetic fields. We find that even with the inclusion of significant fallback accretion, in all but a few cases it is energetically challenging to produce prompt emission, afterglow and giant flares within the constraints of the rotational energy budget of a magnetar.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Magnetars, Gamma ray bursts | |||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||||||||
| ISSN: | 1365-2966 | |||||||||||||||
| Official Date: | August 2018 | |||||||||||||||
| Dates: |
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| Volume: | 478 | |||||||||||||||
| Number: | 4 | |||||||||||||||
| Page Range: | pp. 4323-4335 | |||||||||||||||
| DOI: | 10.1093/mnras/sty1363 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| RIOXX Funder/Project Grant: |
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