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  Characterization of lensing selection effects for LISA massive black hole binary mergers

Cusin, G., & Tamanini, N. (2021). Characterization of lensing selection effects for LISA massive black hole binary mergers. Monthly notices of the Royal Astronomical Society, 504(3), 3610-3618. doi:10.1093/mnras/stab1130.

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Cusin, Giulia, Author
Tamanini, Nicola1, Author              
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, Galaxy Astrophysics, astro-ph.GA, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We present a method to include lensing selection effects due to the finite horizon of a given detector when studying lensing of gravitational wave (GW) sources. When selection effects are included, the mean of the magnification distribution is shifted from one to higher values for sufficiently high-redshift sources. This introduces an irreducible (multiplicative) bias on the luminosity distance reconstruction, in addition to the typical source of uncertainty in the distance determination. We apply this method to study lensing of GWs emitted by massive black hole binary mergers at high redshift detectable by LISA. We estimate the expected bias induced by selection effects on the luminosity distance reconstruction as function of cosmological redshift, and discuss its implications for cosmological and astrophysical analyses with LISA. We also reconstruct the distribution of lensing magnification as a function of the observed luminosity distance to a source, that is the observable quantity in the absence of an electromagnetic counterpart. Lensing provides the dominant source of errors in distance measurements of high-redshift GW sources. Its full characterisation, including the impact of selection effects, is of paramount importance to correctly determine the astrophysical properties of the underlying source population and to be able to use gravitational wave sources as a new cosmological probe.

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 Dates: 2020-11-302021
 Publication Status: Published in print
 Pages: 9 pages, 6 figures
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 Rev. Type: -
 Identifiers: arXiv: 2011.15109
DOI: 10.1093/mnras/stab1130
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Title: Monthly notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 504 (3) Sequence Number: - Start / End Page: 3610 - 3618 Identifier: -