LIGO Document P2500356-v7
- We present results from directed searches for continuous gravitational waves from a sample of 15 nearby supernova remnants, potentially hosting young neutron star candidates, using data from the first eight months of the fourth observing run (O4) of the LIGO-Virgo-KAGRA Collaboration. The analysis employs five pipelines: four semi-coherent methods -- the Band-Sampled-Data directed pipeline, Weave and two Viterbi pipelines (single- and dual-harmonic) -- alongside PyStoch, a cross-correlation-based pipeline. These searches cover wide frequency bands and do not assume known ephemerides for the targets.
No evidence for a signal is found from any of the 15 sources. We set 95\% confidence-level upper limits on the intrinsic strain amplitude, with the most stringent constraints reaching \( \sim 4 \times 10^{-26} \) near 300 Hz for the nearby source G266.2-1.2 (Vela Jr.). We also derive limits on neutron star ellipticity and r-mode amplitudes for the same source, with the best constraints reaching \( \lesssim 10^{-7} \) and \( \lesssim 10^{-5} \), respectively, at frequencies above 400 Hz. These results represent the most sensitive wide-band directed searches for continuous gravitational waves from supernova remnants to date. No evidence for a signal is found from any of the 15 sources. We set 95\% confidence-level upper limits on the intrinsic strain amplitude, with the most stringent constraints reaching \( \sim 4 \times 10^{-26} \) near 300 Hz for the nearby source G266.2-1.2 (Vela Jr.). We also derive limits on neutron star ellipticity and r-mode amplitudes for the same source, with the best constraints reaching \( \lesssim 10^{-7} \) and \( \lesssim 10^{-5} \), respectively, at frequencies above 400 Hz. These results represent the most sensitive wide-band directed searches for continuous gravitational waves from supernova remnants to date.
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