Probing Dark Energy with Relaxed Galaxy Clusters

Details Probing Dark Energy with Relaxed Galaxy Clusters Probing Dark Energy with Relaxed Galaxy Clusters

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2444a&link_type=abstract

Chandra Proposal ID #09800310

Physics

Chandra Proposal Id #09800310

Scientific paper

We seek to constrain dark energy using studies of the apparent evolution of the X-ray gas mass fraction in the most X-ray luminous, dynamically relaxed galaxy clusters. The proposed observations will improve the detection of the effects of dark energy from the X-ray data alone to > 5 sigma. More importantly, they will allow us to measure the level of intrinsic (systematic) scatter in distance measurements from this technique and establish whether this is smaller than from type Ia supernovae measurements. Used in combination with supernovae and CMB data, the new Chandra observations will allow the most precise search to date for evolution in the dark energy equation of state - our best approach in trying to understand the origin of cosmic acceleration.

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