LIGO Document P2100437-v6

Search for continuous gravitational wave emission from the Milky Way center in O3 LIGO--Virgo data

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We present a directed search for continuous gravitational wave (CW) signals emitted by spinning neutron stars located in the inner parsecs of the Galactic Center (GC). Compelling evidence for the presence of a numerous population of neutron stars has been reported in the literature, turning this region into a very interesting place to look for CWs.
In this search, data from the full O3 LIGO--Virgo run in the detector frequency band \( [10,2000]\rm~Hz \) have been used.
No significant detection was found and 95\( \% \) confidence level upper limits on the signal strain amplitude were computed, over the full search band, with the deepest limit of about \( 7.6\times 10^{-26} \) at \( \simeq 142\rm~Hz \). These results are significantly more constraining than those reported in previous searches. We use these limits to put constraints on the fiducial neutron star ellipticity and r-mode amplitude. These limits can be also translated into constraints in the black hole mass -- boson mass plane for a hypothetical population of boson clouds around spinning black holes located in the GC.
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