Mon. Not. R. Astron. Soc., 461, 4441-4465 (2016/October-1)
Shock finding on a moving-mesh - II. Hydrodynamic shocks in the Illustris universe.
SCHAAL K., SPRINGEL V., PAKMOR R., PFROMMER C., NELSON D., VOGELSBERGER M., GENEL S., PILLEPICH A., SIJACKI D. and HERNQUIST L.
Abstract (from CDS):
Hydrodynamical shocks are a manifestation of the non-linearity of the Euler equations and play a fundamental role in cosmological gas dynamics. In this work, we identify and analyse shocks in the Illustris simulation, and contrast the results with those of non-radiative runs. We show that simulations with more comprehensive physical models of galaxyformation pose new challenges for shock finding algorithms due to radiative cooling and star-forming processes, prompting us to develop a number of methodology improvements. We find in Illustris a total shock surface area which is about 1.4 times larger at the present epoch compared to non-radiative runs, and an energy dissipation rate at shocks which is higher by a factor of around 7. Remarkably, shocks with Mach numbers above and below M~10 contribute about equally to the total dissipation across cosmic time. This is in sharp contrast to non-radiative simulations, and we demonstrate that a large part of the difference arises due to strong black hole radio-mode feedback in Illustris. We also provide an overview of the large diversity of shock morphologies, which includes complex networks of halo-internal shocks, shocks on to cosmic sheets, feedback shocks due to black holes and galactic winds, as well as ubiquitous accretion shocks. In high-redshift systems more massive than 1012 M☉, we discover the existence of a double accretion shock pattern in haloes. They are created when gas streams along filaments without being shocked at the outer accretion shock, but then forms a second, roughly spherical accretion shock further inside.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
hydrodynamics - shock waves - methods: numerical - galaxies: clusters: general - galaxies: kinematics and dynamics - large-scale structure of Universe - large-scale structure of Universe
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