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All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data
Name
PhysRevD.104.082004.pdf
Description
Published version
Size
2.41 MB
Format
Adobe PDF
Checksum (MD5)
7fc26a728d6ea7a874b30db13e7718da
Date Issued
2021
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
2021. "All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data." Physical Review D, 104 (8).
Version
Final published version
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
$[-1.0, +0.1]\times10^{-8}$\,Hz/s. Such a signal could be produced by a nearby,
spinning and slightly non-axisymmetric 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 (CL) frequentist upper limits
are placed on their strengths. The lowest upper limits on worst-case (linearly
polarized) strain amplitude $h_0$ are $~1.7\times10^{-25}$ near 200\,Hz. For a
circularly polarized source (most favorable orientation), the lowest upper
limits are $\sim6.3\times10^{-26}$. These strict frequentist upper limits refer
to all sky locations and the entire range of frequency derivative values. For a
population-averaged ensemble of sky locations and stellar orientations, the
lowest 95\%\ CL upper limits on the strain amplitude are
$\sim1.\times10^{-25}$. These upper limits improve upon our previously
published all-sky results, with the greatest improvement (factor of $\sim$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.
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DOI of Published Version
10.1103/PHYSREVD.104.082004
