Constraining the average magnetic field in galaxy clusters with current and upcoming CMB surveys
arXiv:2402.17445 · doi:10.1088/1475-7516/2024/11/010
Abstract
Galaxy clusters that host radio halos indicate the presence of population(s) of non-thermal electrons. These electrons can scatter low-energy photons of the Cosmic Microwave Background, resulting in the non-thermal Sunyaev-Zeldovich (ntSZ) effect. We measure the average ntSZ signal from 62 radio-halo hosting clusters using the multi-frequency all-sky maps. We find no direct evidence of the ntSZ signal in the data. Combining the upper limits on the non-thermal electron density with the average measured synchrotron power collected from the literature, we place lower limits on the average magnetic field strength in our sample. The lower limit on the volume-averaged magnetic field is G, depending on the assumed power-law distribution of electron energies. We further explore the potential improvement of these constraints from the upcoming Simons Observatory and Fred Young Submillimeter Telescope (FYST) of the CCAT-prime collaboration. We find that combining these two experiments, the constraints will improve by a factor of two, which can be sufficient to rule out some power-law models.
arXiv comment21 pages + appendices and bibliography, 9 figures, 6 tables; accepted for publication in JCAP
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