Wright, M., Janquart, J. and Hendry, M. (2023) Determination of lens mass density profile from strongly-lensed gravitational-wave signals. Astrophysical Journal, 959(2), 70. (doi: 10.3847/1538-4357/ad0891)
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Abstract
As the interferometers detecting gravitational waves are upgraded, improving their sensitivity, the probability of observing strong lensing increases. Once a detection is made, it will be critical to gain as much information as possible about the lensing object from these observations. In this work, we present a methodology to rapidly perform model selection between differing mass density profiles for strongly lensed gravitational wave signals, using the results of the fast strong lensing analysis pipeline GOLUM. We demonstrate the validity of this methodology using some illustrative examples adopting the idealised singular isothermal sphere and point mass lens models. We take several simulated lensed signals, analyse them with GOLUM and subject them to our methodology to recover both the model and its parameters. To demonstrate the methodology's stability, we show how the result varies with the number of samples used for a subset of these injections. In addition to the analysis of simulations, we also apply our methodology to the gravitational wave event pair GW191230--LGW200104, two events with similar frequency evolutions and sky locations, which was analysed in detail as a potential lensing candidate but ultimately discarded when considering the full population and the uncertain nature of the second event. We find a preference for the singular isothermal sphere model over the point mass, though our posteriors are much wider than for the lensed injections, in line with the expectations for a non-lensed event. The methodology developed in this work is made available as part of the Gravelamps package of software.
| Item Type: | Articles |
|---|---|
| Additional Information: | MW acknowledges the support of the Science and Technologies Facilities Council (STFC) of the United Kingdom. JJ is supported by the research programme of the Netherlands Organisation for Scientific Research (NWO). MH acknowledges additional support from the Science and Technologies Facilities Council (Ref. ST/L000946/1). This material is based upon work supported by NSF’s LIGO Laboratory which is a major facility fully funded by the National Science Foundation. The authors are grateful for computational resources provided by the LIGO Laboratory and the Leonard E Parker Center for Gravitation, Cosmology, and Astrophysics at the University of Wisconsin-Milwaukee and supported by National Science Foundation Grants PHY-0757058 and PHY-0823459, and PHY-1626190 and PHY-1700765 respectively. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Wright, Mr Michael and Hendry, Professor Martin |
| Authors: | Wright, M., Janquart, J., and Hendry, M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Research Centre: | College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research |
| Journal Name: | Astrophysical Journal |
| Publisher: | IOP Publishing |
| ISSN: | 0004-637X |
| ISSN (Online): | 1538-4357 |
| Published Online: | 07 December 2023 |
| Copyright Holders: | Copyright © 2023. The Author(s) |
| First Published: | First published in Astrophysical Journal 959(2):70 |
| Publisher Policy: | Reproduced under a Creative Commons license |
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