A Heating Model for the Millennium Gas Run

Gazzola, L.; Pearce, Frazer R.

doi:10.1007/978-3-540-73484-0_76

Cited by 2 publications

(1 citation statement)

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“…the Marenostrum universe, Gottloeber et al 2006) or a crude description of star formation (e.g. the Millennium gas project, Gazzola & Pearce 2007). Simulations with higher-though still moderate-spatial resolution and better treatment of cooling and star formation are typically only realized for relatively small simulation volumes (e.g.…”

Section: Introductionmentioning

confidence: 99%

SZE observables, pressure profiles and centre offsets in Magneticum simulation galaxy clusters

Gupta

Saro

Mohr

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present a detailed study of the galaxy cluster thermal Sunyaev-Zel'dovich effect (SZE) signal Y and pressure profiles using Magneticum Pathfinder hydrodynamical simulations. With a sample of 50,000 galaxy clusters (M 500c > 1.4 × 10 14 M ) out to z = 2, we find significant variations in the shape of the pressure profile with mass and redshift and present a new generalized NFW model that follows these trends. We show that the thermal pressure at R 500c accounts for only 80 percent of the pressure required to maintain hydrostatic equilibrium, and therefore even idealized hydrostatic mass estimates would be biased at the 20 percent level. We compare the cluster SZE signal extracted from a sphere with different virial-like radii, a virial cylinder within a narrow redshift slice and the full light cone, confirming small scatter (σ ln Y 0.087) in the sphere and showing that structure immediately surrounding clusters increases the scatter and strengthens non self-similar redshift evolution in the cylinder. Uncorrelated large scale structure along the line of sight leads to an increase in the SZE signal and scatter that is more pronounced for low mass clusters, resulting in non self-similar trends in both mass and redshift and a mass dependent scatter that is ∼ 0.16 at low masses. The scatter distribution is consistent with log-normal in all cases. We present a model of the offsets between the center of the gravitational potential and the SZE center that follows the variations with cluster mass and redshift.

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Section: Introductionmentioning

confidence: 99%