http://arxiv.org/abs/2210.09592
We present a search for continuous gravitational wave signals from an unidentified pulsar potentially powering HESS J1427-608, a spatially-unresolved TeV point source detected by the High Energy Stereoscopic System (H.E.S.S). The search uses a semi-coherent algorithm, which combines the maximum likelihood $\mathcal{F}-$statistic with a hidden Markov Model to efficiently detect and track quasi-monochromatic signals that wander randomly in frequency. It uses data from the second observing run of the Advanced Laser Interferometer Gravitational-Wave Observatory. Multi-wavelength observations of the H.E.S.S. source are combined with the proprieties of the population of TeV-bright pulsar wind nebulae to constrain the search parameters. We find no evidence of gravitational-wave emission from this target. We set upper limits on the characteristic wave strain $h_0^{95\%}$ (for circularly-polarised signals) at $95\%$ confidence level in sample sub-bands and interpolate it to estimate the sensitivity in the full band. We find $h_0^{95\%} = 1.3\times 10^{-25}$ near 185~Hz. The implied constraints on the ellipticity and r-mode amplitude reach $\epsilon\leq 10^{-5}$ and $\alpha \leq 10^{-3}$ at 200~Hz, respectively.
D. Beniwal, P. Clearwater, L. Dunn, et. al.
Wed, 19 Oct 22
38/87
Comments: 16 pages, 7 figures