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- W2042536764 abstract "Evolutions of spherical X-ray clusters of galaxies are studied by using an N-body+total variation diminishing (TVD) mesh code. We consider a growth of density perturbation of 1015 M☉ composed of dark matter and gas in a cold dark matter-dominated universe with Ω0 = 1 or 0.2. When the perturbation collapsed at z ~ 1, a shock front appears at r ~ 0.1 Mpc, moving outward as ambient gas accretes toward cluster center. The shock front separates the inner X-ray-emitting, hot region from the outer cool region. In the former, gas is almost in hydrostatic equilibrium but with small radial infall (~100 km s-1) being left, while in the latter, gas falls almost freely and emits no X-rays. Gas inside the shock is strongly compressed and heated by shock so that X-ray luminosity rapidly rises in the early stage (until temperature reaches about virial). In the late stage, on the other hand, the X-ray luminosity rises only gradually due partly to the expansion of the inner high-temperature region and partly to the increase of X-ray emissivity of gas as the result of continuous adiabatic compression inside the shock. We also find that the density distribution is generally less concentrated in a lower density universe and, hence, X-ray luminosity rises more slowly than in a higher density universe." @default.
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- W2042536764 date "1998-05-20" @default.
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- W2042536764 title "Evolution of X‐Ray Clusters of Galaxies and Shock Heating of the Intracluster Medium" @default.
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- W2042536764 doi "https://doi.org/10.1086/305598" @default.
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