Magnification and evolution bias of transient sources: GWs and SNIa

Abstract

Third-generation gravitational wave (GW) observatories such as the Einstein Telescope and Cosmic Explorer, together with the LSST survey at the Vera Rubin Observatory, will yield an abundance of extra-galactic transient objects. This opens the exciting possibility of using GW sources and Supernovae Type Ia (SNIa) as luminosity distance tracers of large-scale structure for the first time. The large volumes accessible to these surveys imply that we may need to include relativistic corrections, such as lensing and Doppler magnification. However, the amplitude of these effects depends on the magnification and evolution biases of the transient sources, which are not yet understood. In this paper we develop comprehensive frameworks to address and model these biases for both populations of transient objects; in particular, we define how to compute these biases for GW sources. We then analyse the impact of magnification and evolution biases on the relativistic corrections and on the angular power spectrum of these sources. We show that correct modelling and implementation of these biases is crucial for measuring the cross-correlations of transient sources at higher redshifts.

28 pages, 14 figures, 4 tables, comments welcome

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Cited by in corpus (4)

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• Gravitational waves and galaxies cross-correlations: a forecast on GW biases for future detectors
• Exploring future synergies for large-scale structure between gravitational waves and radio sources
• Constraining the lensing dispersion from the angular clustering of binary black hole mergers