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# Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Nov 2022

G4.8+6.2 was proposed as a possible kilonova remnant associated with theKorean guest star of AD 1163 in our Milky Way galaxy. Its age is about 860years according to the historical record. If a neutron star was left in thecenter of G4.8+6.2, this young neutron star may radiate strong continuousgravitational waves, which could beat the indirect age-based upper limit withcurrent LIGO sensitivity. In this work, we searched such continuousgravitational waves in the frequency band $20-1500 \mathrm{~Hz}$. This searchused two days of LIGO O3b data from the Hanford and Livingston detectors. Whileno signal was found, we placed upper limits on the gravitational wave strain.For comparison we also showed the latest results of all-sky searches obtainedwith various search pipelines. With upgrading of the LIGO detectors, it willprovide the opportunity to see whether a black hole or a neutron star isharbored inside G4.8+6.2.

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