Hot and turbulent gas in clusters

Schmidt, W.; Engels, J. F.; Niemeyer, J. C.; Almgren, A. S.

doi:10.1093/mnras/stw632

Title: Hot and turbulent gas in clusters

Journal Article · Sun Mar 20 00:00:00 EDT 2016 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stw632· OSTI ID:1393051

Schmidt, W. ^[1]; Engels, J. F. ^[2]; Niemeyer, J. C. ^[2]; Almgren, A. S. ^[3]

Univ. Gottingen (Germany); Univ. of Hamburg (Germany)
Univ. Gottingen (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The gas in galaxy clusters is heated by shock compression through accretion (outer shocks) and mergers (inner shocks). These processes also produce turbulence. To analyse the relation between the thermal and turbulent energies of the gas under the influence of non-adiabatic processes, we performed numerical simulations of cosmic structure formation in a box of 152 Mpc comoving size with radiative cooling, UV background, and a subgrid scale model for numerically unresolved turbulence. By smoothing the gas velocities with an adaptive Kalman filter, we are able to estimate bulk flows towards cluster cores. This enables us to infer the velocity dispersion associated with the turbulent fluctuation relative to the bulk flow. For haloes with masses above 10¹³ M_⊙, we find that the turbulent velocity dispersions averaged over the warm-hot intergalactic medium (WHIM) and the intracluster medium (ICM) are approximately given by powers of the mean gas temperatures with exponents around 0.5, corresponding to a roughly linear relation between turbulent and thermal energies and transonic Mach numbers. However, turbulence is only weakly correlated with the halo mass. Since the power-law relation is stiffer for the WHIM, the turbulent Mach number tends to increase with the mean temperature of the WHIM. This can be attributed to enhanced turbulence production relative to dissipation in particularly hot and turbulent clusters.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1393051

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 1; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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