SZ effects in the Magneticum Pathfinder simulation: comparison with the Planck, SPT, and ACT results
Abstract
We calculate the onepoint probability density distribution functions (PDF) and the power spectra of the thermal and kinetic SunyaevZeldovich (tSZ and kSZ) effects and the mean Compton Y parameter using the Magneticum Pathfinder simulations, stateoftheart cosmological hydrodynamical simulations of a large cosmological volume of (896 Mpc h^{1})^{3}. These simulations follow in detail the thermal and chemical evolution of the intracluster medium as well as the evolution of supermassive black holes and their associated feedback processes. We construct fullsky maps of tSZ and kSZ from the lightcones out to z = 0.17, and one realization of 8.8° × 8.8° deep lightcone out to z = 5.2. The local universe at z < 0.027 is simulated by a constrained realization. The tail of the onepoint PDF of tSZ from the deep lightcone follows a powerlaw shape with an index of 3.2. Once convolved with the effective beam of Planck, it agrees with the PDF measured by Planck. The predicted tSZ power spectrum agrees with that of the Planck data at all multipoles up to l ≈ 1000, once the calculations are scaled to the Planck 2015 cosmological parameters with Ω_{m} = 0.308 and σ_{8} = 0.8149. Consistent with the results in the literature, however, we continue to find the tSZ power spectrum at l = 3000 that is significantly larger than that estimated from the highresolution groundbased data. The simulation predicts the mean fluctuating Compton Y value of bar{Y}=1.18× 10^{6} for Ω_{m} = 0.272 and σ_{8} = 0.809. Nearly half (≈5 × 10^{7}) of the signal comes from haloes below a virial mass of 10^{13} M_{⊙} h^{1}. Scaling this to the Planck 2015 parameters, we find bar{Y}=1.57× {}10^{6}.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 December 2016
 DOI:
 10.1093/mnras/stw2035
 arXiv:
 arXiv:1509.05134
 Bibcode:
 2016MNRAS.463.1797D
 Keywords:

 hydrodynamics;
 methods: numerical;
 galaxies: clusters: general;
 cosmic background radiation;
 cosmology: theory;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 16 pages, 10 figures, MNRAS in press, http://www.mageticum.org