Exploring Cosmic Origins with CORE: Cluster Science

Abstract

We examine the cosmological constraints that can be achieved with a galaxy cluster survey with the future CORE space mission. Using realistic simulations of the millimeter sky, produced with the latest version of the Planck Sky Model, we characterize the CORE cluster catalogues as a function of the main mission performance parameters. We pay particular attention to telescope size, key to improved angular resolution, and discuss the comparison and the complementarity of CORE with ambitious future ground-based CMB experiments that could be deployed in the next decade. A possible CORE mission concept with a 150 cm diameter primary mirror can detect of the order of 50,000 clusters through the thermal Sunyaev-Zeldovich effect (SZE). The total yield increases (decreases) by 25% when increasing (decreasing) the mirror diameter by 30 cm. The 150 cm telescope configuration will detect the most massive clusters ($>10^{14}{M}_{\odot }$) at redshift $z>1.5$ over the whole sky, although the exact number above this redshift is tied to the uncertain evolution of the cluster SZE flux-mass relation; assuming self-similar evolution, CORE will detect $\sim 500$ clusters at redshift $z>1.5$. This changes to 800 (200) when increasing (decreasing) the mirror size by 30 cm. CORE will be able to measure individual cluster halo masses through lensing of the cosmic microwave background anisotropies with a 1-$\sigma$ sensitivity of $4\times 10^{14}{M}_{\odot }$, for a 120 cm aperture telescope, and $10^{14}{M}_{\odot }$ for a 180 cm one. [abridged]

35 pages, 15 figures, to be submitted to JCAP

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• Relativistic SZ temperature scaling relations of groups and clusters derived from the BAHAMAS and MACSIS simulations
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• Kinetic Inductance Detectors for the OLIMPO experiment: design and pre-flight characterization
• Constraining sterile neutrinos by core-collapse supernovae with multiple detectors
• Exploring cosmic origins with CORE: effects of observer peculiar motion
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• In-flight performance of the LEKIDs of the OLIMPO experiment
• On the kinetic Sunyaev-Zel'dovich effect as an observational probe for halo spin bias
• Reconstructing a non-linear interaction in the dark sector with cosmological observations
• Kinetic Inductance Detectors and readout electronics for the OLIMPO experiment
• Cosmological impact of microwave background temperature measurements
• Total power horn-coupled 150 GHz LEKID array for space applications
• "SZ spectroscopy" in the coming decade: Galaxy cluster cosmology and astrophysics in the submillimeter
• Extragalactic astrophysics with next-generation CMB experiments