Physical Sciences and Mathematics Commons^™

X-Ray Scaling Relations Of Galaxy Groups In A Hydrodynamic Cosmological Simulation, R Dave, N Katz, Dh Weinberg

Astronomy Department Faculty Publication Series

We examine the scalings of X-ray luminosity, temperature, and dark matter or galaxy velocity dispersion for galaxy groups in a ΛCDM cosmological simulation, which incorporates gravity, gas dynamics, radiative cooling, and star formation, but no substantial nongravitational heating. In agreement with observations, the simulated L_X-σ and L_X-T_X relations are steeper than those predicted by adiabatic simulations or self-similar models, with L_X σ^4.4 and L_X T for massive groups and significantly steeper relations below a break at σ 180 km s^-1 (T_X 0.7 keV). The T_X-σ relation …