Abstract
We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 1700-2000 Hz range from neutron stars with ellipticity of 1e-8. The search employs the Falcon analysis pipeline [citation 5] on LIGO O2 public data. Our results improve by a factor greater than 5 over [citation 11]. This is a huge leap forward: it takes an entirely new generation of gravitational wave detectors to achieve a 10-fold sensitivity increase over the previous generation [citation 12]. Within the probed frequency range and aside from the detected outliers, we can exclude neutron stars with ellipticity of 1e-8 within 65 pc of Earth. We set upper limits on the gravitational wave amplitude that hold even for worst-case signal parameters. New outliers are found, some of which we are unable to associate with any instrumental cause. If any were associated with a rotating neutron star, this would likely be the fastest neutron star today.
Highlights
Detectable continuous gravitational waves are expected from fast rotating neutron stars if they present some sort of nonaxially symmetric deformation
We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 1700–2000 Hz range from neutron stars with ellipticity of ≈10−8
If any were associated with a rotating neutron star, this would likely be the fastest neutron star today
Summary
In the literature IT2 signals are used as a reference to measure search performance, and for upper limits. This search employs a first coherence length of 12 hours. The process is repeated with a coherence length of 48 hours and of 144 hours, as done in [2] This search is considerably more computationally intensive per unit frequency interval compared to [2], and it took approximately the same amount of compute cycles to cover 300 Hz in this frequency range than it did to cover 1200 Hz at the lower frequencies investigated in [2]. 300.802 −14.320 ip14 300.898 11.804 ip echo 238.873 84.926 H1 line 171.140 57.628 216.530 −46.769 198.326 −73.539 L1 line
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