Speaker
Description
The SKAO's ability to survey the radio continuum and neutral hydrogen (HI) signals with a wide sky coverage and up to high redshift makes it a cardinal experiment to probe the large-scale structure of the Universe. Radio continuum galaxies and the HI signal from intensity mapping (IM) constitute cosmological tracers capable of enhancing the astrophysical and cosmological information embedded in other observables, in particular gravitational waves (GWs). Therefore, given the redshift overlap, it is valuable to explore the synergy among these SKAO datasets and GWs detected by upcoming third-generation interferometers.
In this work, we first determine which of the aforementioned SKAO tracers provides the best cross-correlation with GW data to investigate the astrophysical or primordial origin of the merging binary black holes. Secondly, we focus on statistically constraining the profile of the GW redshift distribution. This can be linked to the parameterization of the time delay probability and of the GW event probability as a function of the halo mass. Since the cross-correlation amplitude deeply relies on the redshift profile of the involved tracers, through such cross-correlation signal, we constrain those probability functions and, thus, the GW redshift distribution.
| Topics | Cosmology |
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