Galaxy Groups in a Cosmological Simulation: X-Ray Scaling Relations

Details Galaxy Groups in a Cosmological Simulation: X-Ray Scaling Relations Galaxy Groups in a Cosmological Simulation: X-Ray Scaling Relations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514716t&link_type=abstract

American Astronomical Society Meeting 205, #147.16; Bulletin of the American Astronomical Society, Vol. 36, p.1595

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We study the scaling relations of X-ray luminosity, temperature, and velocity dispersion for galaxy groups created in a {Λ }CDM cosmological simulation. We examine the effects of supernovae-driven galactic winds and varying resolutions. As in observations of galaxy groups, our simulated LX - σ and LX - TX relations are steeper and the TX - σ slightly shallower than those of both self-similar models and observed galaxy clusters. Both the LX - σ and LX - TX relations are best fit by a significantly steeper power-law below σ ˜ 300 km s-1. We compare our results to observations and explain the implications of our simulations for radiative cooling and nongravitational pre-heating in galaxy groups.

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