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Kwak, Kyujin
Computational Astrophysics Lab
Research Interests
  • Computational Fluid Dynamics
  • Astrophysical and Laboratory Plasma
  • Hydrodynamics with Radiation
  • Nuclear, Atomic, and Molecular Reactions

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All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data

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Title
All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data
Author
Abbott, RKwak, KHa, SJung, KKim, Y-MLin, L. C-C
Issue Date
2021-10
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.104, no.8, pp.082004
Abstract
We report on an all-sky search for continuous gravitational waves in the frequency band 20-2000 Hz and with a frequency time derivative in the range of [-1.0; +0.1] x 10(-8) Hz/s. Such a signal could be produced by a nearby, spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the LIGO data from the first six months of Advanced LIGO's and Advanced Virgo's third observational run, O3. No periodic gravitational wave signals are observed, and 95% confidence-level (C.L.) frequentist upper limits are placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h(0) are similar to 1.7 x 10(-25) near 200 Hz. For a circularly polarized source (most favorable orientation), the lowest upper limits are similar to 6.3 x 10(-26). These strict frequentist upper limits refer to all sky locations and the entire range of frequency derivative values. For a populationaveraged ensemble of sky locations and stellar orientations, the lowest 95% C.L. upper limits on the strain amplitude are similar to 1.4 x 10(-25). These upper limits improve upon our previously published all-sky results, with the greatest improvement (factor of similar to 2) seen at higher frequencies, in part because quantum squeezing has dramatically improved the detector noise level relative to the second observational run, O2. These limits are the most constraining to date over most of the parameter space searched.
URI
https://scholarworks.unist.ac.kr/handle/201301/54814
URL
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.104.082004
DOI
10.1103/PhysRevD.104.082004
ISSN
2470-0010
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PHY_Journal Papers
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