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

Details Probing Dark Energy using the X-ray gas mass fraction in galaxy clusters. Probing Dark Energy using the X-ray gas mass fraction in galaxy clusters.

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.2108a&link_type=abstract

American Astronomical Society Meeting 206, #21.08; Bulletin of the American Astronomical Society, Vol. 37, p.463

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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