Searches for continuous gravitational waves from nine young supernova remnants. (arXiv:1412.5942v2 [astro-ph.HE] UPDATED)

Searches for continuous gravitational waves from nine young supernova remnants. (arXiv:1412.5942v2 [astro-ph.HE] UPDATED)
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(830 additional authors not shown)

We describe directed searches for continuous gravitational waves in data from
the sixth LIGO science data run. The targets were nine young supernova remnants
not associated with pulsars; eight of the remnants are associated with
non-pulsing suspected neutron stars. One target’s parameters are uncertain
enough to warrant two searches, for a total of ten. Each search covered a broad
band of frequencies and first and second frequency derivatives for a fixed sky
direction. The searches coherently integrated data from the two LIGO
interferometers over time spans from 5.3-25.3 days using the matched-filtering
F-statistic. We found no credible gravitational-wave signals. We set 95%
confidence upper limits as strong (low) as $4times10^{-25}$ on intrinsic
strain, $2times10^{-7}$ on fiducial ellipticity, and $3times10^{-6}$ on
r-mode amplitude. These beat the indirect limits from energy conservation and
are within the range of theoretical predictions for neutron-star ellipticities
and r-mode amplitudes.

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