Journal article
Search for continuous gravitational waves directed at subthreshold radiometer candidates in O3 LIGO data
AM Knee, H Du, E Goetz, J McIver, JB Carlin, L Sun, L Dunn, L Strang, H Middleton, A Melatos
Physical Review D | AMER PHYSICAL SOC | Published : 2024
Abstract
We present results of a follow-up search for continuous gravitational waves (CWs) associated with subthreshold candidates from the LIGO-Virgo-KAGRA (LVK) all-sky all-frequency (ASAF) directed radiometer analysis, using Advanced LIGO data from the third observing run (O3). Each ASAF candidate corresponds to a 1/32 Hz frequency band and ∼13 deg2 sky pixel. Assuming they represent possible CW sources, we analyze all 515 ASAF candidates using a semi-coherent, F-statistic-based matched filter search. The search algorithm incorporates a hidden Markov model (HMM), expanding the signal model to allow frequency spin-wandering, as well as unmodeled frequency evolution of less than 10-5 Hz per day that..
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Grants
Awarded by UK Space Agency
Funding Acknowledgements
We thank James Clark for assistance with submitting computing jobs through the IGWN Computing Grid. We thank the LVK CW and Anisotropic working groups for helpful discussions. This material is based upon work supported by NSF's LIGO Laboratory which is a major facility fully funded by the National Science Foundation. This research was done using services provided by the OSG Consortium [93 - 96], which is supported by the National Science Foundation Awards No. OAC-2030508 and No. OAC-1836650. This research was enabled in part by support provided by the Digital Research Alliance of Canada ( [97]). We are also grateful for computational resources provided by the LIGO Laboratory and supported by National Science Foundation Awards No. PHY-0757058 and No. PHY-0823459. A. M. K., H. D., E. G., and J. M. acknowledge funding support from the Natural Sciences and Engineering Research Council of Canada. A. M. K. acknowledges funding support from a Killam Doctoral Scholarship. J. B.C., L. S., L. D., L. S., and A. M. acknowledge the support of the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), Project No. CE170100004. H. M. acknowledges the support of the UK Space Agency Grants No. ST/V002813/1 and No. ST/X002071/1.r acknowledge funding support from the Natural Sciences and Engineering Research Council of Canada. A. M. K. acknowledges funding support from a Killam Doctoral Scholarship. J. B.C., L. S., L. D., L. S., and A. M. acknowl-edge the support of the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav) , Project No. CE170100004. H. M. acknowledges the sup-port of the UK Space Agency Grants No. ST/V002813/1 and No. ST/X002071/1.