Supercluster simulations: impact of baryons on the matter power spectrum and weak lensing forecasts for Super-CLASS
Year: 2017
Type: article
Abstract: We use a combination of full hydrodynamic and dark matter only simulations to investigate the effect that supercluster environments and baryonic physics have on the matter power spectrum, by re-simulating a sample of supercluster sub-volumes. On large scales we find that the matter power spectrum measured from our supercluster sample has at least twice as much power as that measured from our random sample. Our investigation of the effect of baryonic physics on the matter power spectrum is found to be in agreement with previous studies and is weaker than the selection effect over the majority of scales. In addition, we investigate the effect of targeting a cosmologically non-representative, supercluster region of the sky on the weak lensing shear power spectrum. We do this by generating shear and convergence maps using a line-of-sight integration technique, which intercepts our random and supercluster sub-volumes. We find the convergence power spectrum measured from our supercluster sample has a larger amplitude than that measured from the random sample at all scales. We frame our results within the context of the Super-CLuster Assisted Shear Survey (Super-CLASS), which aims to measure the cosmic shear signal in the radio band by targeting a region of the sky that contains five Abell clusters. Assuming the Super-CLASS survey will have a source density of 1.5 galaxies arcmin−2, we forecast a detection significance of $2.7^{+1.5}_{-1.2}$, which indicates that in the absence of systematics the Super-CLASS project could make a cosmic shear detection with radio data alone.
Authors: Aaron Peters, Michael L Brown, Scott T Kay, David J Barnes
Institution: University of Manchester
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Visiting Fellowships at Durham, G1381339075, Durham DiRAC-2 petascale facility, DiRAC-2.5 - the pathway to DiRAC Phase 3, G2245639647, G2918681272, DiRAC-2 Datacentric support grant, The Radio Universe: astronomy and astrophysics at the Jodrell Bank Centre for Astrophysics 2014-2017, G432354605, G4831232377, G4923167024, Astrophysics and Cosmology Research within the JBCA 2017-2020, DiRAC-2.5 DC - Operations 2017-2020, G7165083805, G8092745986, The Virgo consortium for cosmological supercomputer simulations, Durham DiRAC-2 petascale facility support
OpenAlex ID: W2767133106