Mapping "out-of-the-box" the properties of the baryons in massive halos
Journal
Date Issued
2022
Author(s)
Abstract
We study the distributions of the baryons in massive halos ($M_{vir} >
10^{13} \ h^{-1}M_{\odot}$) in the $Magneticum$ suite of Smoothed Particle
Hydrodynamical cosmological simulations, out to the unprecedented radial extent
of $10 R_{500,\mathrm c}$. We confirm that, under the action of
non-gravitational physical phenomena, the baryon mass fraction is lower in the
inner regions ($6 R_{500,\mathrm c}$), where the baryon depletion factor $Y_{\rm bar}
= f_{\rm bar} / (\Omega_{\rm b}/\Omega_{\rm m})$ approaches the value of unity,
expected for "closed-box" systems. We find that both the radial and mass
dependency 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 $Y_{\rm star} \approx 0.09$, where also the gas metallicity
is constant, regardless of the host halo mass, as a result of the early ($z>2$)
enrichment process.
Volume
663
Start page
L6
Issn Identifier
0004-6361
Rights
open.access
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