Mapping 'out-of-the-box' the properties of the baryons in massive halos

Angelinelli, M.; Ettori, S.; Dolag, K.; Vazza, F. und Ragagnin, A. (2022): Mapping 'out-of-the-box' the properties of the baryons in massive halos. In: Astronomy & Astrophysics, Bd. 663, L6

Abstract

We study the distributions of the baryons in massive halos (M-vir > 10(13) h(-1) M-circle dot) in the Magneticum suite of smoothed particle hydrodynamical cosmological simulations, out to the unprecedented radial extent of 10R(500,c). We confirm that, under the action of non-gravitational physical phenomena, the baryon mass fraction is lower in the inner regions ( 6R(500,c)), where the baryon depletion factor Y-bar = f(bar)/(Omega(b)/Omega(m)) approaches the value of unity, expected for 'closed-box' systems. We find that both the radial and mass dependence of the baryon, gas, and hot depletion factors are predictable and follow a simple functional form. The star mass fraction is higher in less massive systems, decreases systematically with increasing radii, and reaches a constant value of Y-star approximate to 0.09, where the gas metallicity is also constant, regardless of the host halo mass, as a result of the early (z > 2) enrichment process.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-6361
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390783311