Search for continuous gravitational waves from neutron stars in five globular clusters with a phase-tracking hidden Markov model in the third LIGO observing run - INSPIRE

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Search for continuous gravitational waves from neutron stars in five globular clusters with a phase-tracking hidden Markov model in the third LIGO observing run

L. Dunn
(
)
,
A. Melatos
(
)
,
P. Clearwater
(
)
,
S. Suvorova
(
)
,
L. Sun
(
- Australian Natl. U., Canberra and
- Australian Natl. U., Canberra (main)
)

Mar 19, 2025

e-Print:

2503.15773 [gr-qc]

View in:

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Abstract: (arXiv)

A search is performed for continuous gravitational waves emitted by unknown neutron stars in five nearby globular clusters using data from the third Laser Interferometer Gravitational-Wave Observatory (LIGO) observing run, over the frequency range

100

--

800\,\mathrm{Hz}

. The search uses a hidden Markov model to track both the frequency and phase of the continuous wave signal from one coherent segment to the next. It represents the first time that a phase-tracking hidden Markov model has been used in a LIGO search. After applying vetoes to reject candidates consistent with non-Gaussian artifacts, no significant candidates are detected. Estimates of the strain sensitivity at 95% confidence

h_{0,\mathrm{eff}}^{95\%}

and corresponding neutron star ellipticity

\epsilon^{95\%}

are presented. The best strain sensitivity,

h_{0,\mathrm{eff}}^{95\%} = 2.7 \times 10^{-26}

at

211\,\mathrm{Hz}

, is achieved for the cluster NGC6544.

Note:

Accepted for publication in Physical Review D

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