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

Abbott, R. and Wallace, G.S and Talbot, C. and Reid, Stuart and Hill, Calum and Gier, Chalisa and Ben Yaala, Marwa and Angelova, Svetoslava, LIGO Scientific Collaboration and Virgo Collaboration, KAGRA Collaboration (2022) Search for continuous gravitational wave emission from the Milky Way center in O3 LIGO-Virgo data. Physical Review D, 106 (4). 042003. ISSN 1550-2368 (https://doi.org/10.1103/PhysRevD.106.042003)

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Abstract

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]  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 7.6×10−26 at ≃142  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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