The effect of massive neutrinos on the Sunyaev–Zel'dovich and X-ray observables of galaxy clusters
作者： M. Roncarelli , C. Carbone , L. Moscardini
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摘要: Massive neutrinos are expected to influence the formation of large-scale structure Universe, depending on value their total mass, $\Sigma m_\nu$. In particular Planck data indicate that a non-zero m_\nu$ may help reconcile CMB with Sunyaev-Zel'dovich (SZ) cluster surveys. order study impact SZ and X-ray properties we run set six very large cosmological simulations (8$h^{-3}$ Gpc$^3$ comoving volume) include massive neutrino particle component: consider values = (0, 0.17, 0.34) eV in two scenarios test possible degeneracies. Using halo catalogues extracted from outputs produce 50 mock light-cones and, assuming suitable scaling relations, determine how affect counts, $y$-parameter its power spectrum. We provide forecasts for South Pole Telescope (SPT) eROSITA surveys, showing number detections is reduced by 40 per cent when =0.34 respect model massless neutrinos. However degeneracy $\sigma_8$ $\Omega_m$ strong, data, requiring use additional probes break it. The also highly influenced mass fraction, $f_\nu$, $ \propto(1-f_\nu)^{20}$, considering component only, normalization spectrum proportional $(1-f_\nu)^{25-30}$. Comparing our findings SPT Atacama Cosmology measurements at $\ell$ 3000 indicates that, parameters assumed, m_\nu\simeq0.34$ required fit data.
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