Extragalactic sources in Cosmic Microwave Background maps
G. De Zotti, G. Castex, J. Gonzalez-Nuevo, M. Lopez-Caniego, M., Negrello, Z.-Y. Cai, M. Clemens, J. Delabrouille, D. Herranz, L. Bonavera,, J.-B. Melin, M. Tucci, S. Serjeant, M. Bilicki, P. Andreani, D. L. Clements,, L. Toffolatti, B.F. Roukema

TL;DR
This paper evaluates the capabilities of a proposed next-generation space-based CMB experiment, COrE+, for detecting and studying extragalactic sources, including galaxies, lensed galaxies, and proto-clusters, with significant improvements over Planck.
Contribution
It presents a detailed analysis of COrE+'s potential for extragalactic source detection, including simulations and expected scientific advancements across multiple astrophysical fields.
Findings
COrE+ will detect thousands of gravitationally lensed galaxies.
The experiment will significantly improve source detection limits over Planck.
High-frequency maps will enable studies of proto-clusters and magnetic fields in galaxies.
Abstract
We discuss the potential of a next generation space-borne CMB experiment for studies of extragalactic sources with reference to COrE+, a project submitted to ESA in response to the M4 call. We consider three possible options for the telescope size: 1m, 1.5m and 2m (although the last option is probably impractical, given the M4 boundary conditions). The proposed instrument will be far more sensitive than Planck and will have a diffraction-limited angular resolution. These properties imply that even the 1m telescope option will perform substantially better than Planck for studies of extragalactic sources. The source detection limits as a function of frequency have been estimated by means of realistic simulations. The most significant improvements over Planck results are presented for each option. COrE+ will provide much larger samples of truly local star-forming galaxies, making possible…
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