AAS 205th Meeting, 9-13 January 2005
Session 147 Groups and Clusters of Galaxies
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

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

J.R. Trump, R. Dave (Steward Observatory), V. Springel (Max Planck Institute), L. Hernquist (Harvard CFA)

We study the scaling relations of X-ray luminosity, temperature, and velocity dispersion for galaxy groups created in a {\Lambda}CDM cosmological simulation. We examine the effects of supernovae-driven galactic winds and varying resolutions. As in observations of galaxy groups, our simulated LX - \sigma and LX - TX relations are steeper and the TX - \sigma slightly shallower than those of both self-similar models and observed galaxy clusters. Both the LX - \sigma and LX - TX relations are best fit by a significantly steeper power-law below \sigma ~ 300 {\rm 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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© 2004. The American Astronomical Society.