Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1847a&link_type=abstract
Chandra Proposal ID #05808189
Physics
Chandra Proposal Id #05808189
Scientific paper
We propose to observe a sample of the most X-ray luminous, dynamically relaxed galaxy clusters identified from the ROSAT All-Sky Survey and follow-up Chandra snapshot observations. Our primary goals are to obtain improved constraints on dark energy and the dark equation of state parameter using the apparent variation of the X-ray gas mass fraction with redshift. This project represents an opportunity for Chandra to take the lead in dark energy work. The observations should lead to a detection of the effects of dark energy from the Chandra data alone at the ~5sigma level, using only weak priors on the Hubble constant and mean baryon density of the Universe. When combined with CMB and supernova data, the observations should constrain the time averaged dark energy equation of state parameter, w, to better than 10 per cent accuracy (68 per cent confidence limits). The new data will also be used for joint X-ray/SZ/lensing studies.
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