AAS 206th Meeting, 29 May - 2 June 2005
Session 21 Galaxies and Cosmology
Oral, Monday, 2:00-3:30pm, May 30, 2005, 102 E

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[21.08] Probing Dark Energy using the X-ray gas mass fraction in galaxy clusters.

S.W. Allen (KIPAC), R.W. Schmidt (Heidelberg), H. Ebeling (Univeristy of Hawaii), D. A. Rapetti (University of Barcelona), J. Weller (Fermilab), L. van Speybroeck (CfA)

I will present the latest results on the mean matter density, dark energy density and dark energy equation of state from Chandra measurements of the X-ray gas mass fraction in the largest, dynamically relaxed clusters. This method, like supernovae studies, allows us to measure the acceleration of the Universe directly and leads to comparable, though entirely independent, constraints. I will highlight the remarkably complementary nature of X-ray, cosmic microwave background and supernovae studies and show how the combination of these data already provides interesting constraints on the evolution of dark energy, using only minimal prior constraints.

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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.