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https://hdl.handle.net/2440/66409
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Type: | Journal article |
Title: | Search for gravitational wave bursts from six magnetars |
Author: | Hosken, D. Munch, J. Ottaway, D. Veitch, P. |
Citation: | Letters of the Astrophysical Journal, 2011; 734(2):L35-1-L35-9 |
Publisher: | Institute of Physics Publishing |
Issue Date: | 2011 |
ISSN: | 2041-8205 2041-8213 |
Statement of Responsibility: | J. Abadie... D. J. Hosken... J. Munch... D. J. Ottaway... P. J. Veitch...et al. |
Abstract: | Soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are thought to be magnetars: neutron stars powered by extreme magnetic fields. These rare objects are characterized by repeated and sometimes spectacular gamma-ray bursts. The burst mechanism might involve crustal fractures and excitation of non-radial modes which would emit gravitational waves (GWs). We present the results of a search for GW bursts from six galactic magnetars that is sensitive to neutron star f-modes, thought to be the most efficient GW emitting oscillatory modes in compact stars. One of them, SGR 0501+4516, is likely 1kpc from Earth, an order of magnitude closer than magnetars targeted in previous GW searches. A second, AXP 1E 1547.0-5408, gave a burst with an estimated isotropic energy >1044erg which is comparable to the giant flares. We find no evidence of GWs associated with a sample of 1279 electromagnetic triggers from six magnetars occurring between 2006 November and 2009 June, in GW data from the LIGO, Virgo, and GEO600 detectors. Our lowest model-dependent GW emission energy upper limits for band- and time-limited white noise bursts in the detector sensitive band, and for f-mode ringdowns (at 1090Hz), are 3.0 × 1044 d 21erg and 1.4 × 10 47 d 21erg, respectively, where and d 0501 is the distance to SGR 0501+4516. These limits on GW emission from f-modes are an order of magnitude lower than any previous, and approach the range of electromagnetic energies seen in SGR giant flares for the first time. © 2011. The American Astronomical Society. All rights reserved. |
Keywords: | gravitational waves stars magnetars |
Rights: | Copyright 2011. The American Astronomical Society. |
DOI: | 10.1088/2041-8205/734/2/L35 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1088/2041-8205/734/2/l35 |
Appears in Collections: | Aurora harvest 5 Environment Institute publications IPAS publications |
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