a Differential X-Ray Gunn-Peterson Test Using a Giant Cluster Filament

Details a Differential X-Ray Gunn-Peterson Test Using a Giant Cluster Filament a Differential X-Ray Gunn-Peterson Test Using a Giant Cluster Filament

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..700m&link_type=abstract

Chandra Proposal ID #02800802

Mathematics

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Chandra Proposal Id #02800802

Scientific paper

We propose a measurement of the absolute density of heavy elements in intercluster space via the X-ray Gunn-Peterson test. It makes use of the unique filament of galaxy clusters spanning over 700 Mpc along the line of sight. We will compare the oxygen edge absorption toward the 4 closest and most distant clusters in this filament. The absorption will be determined by the same instrument and through the same Galactic column, hence the differential test. This will be a completely new measurement with important cosmological implications, since the intercluster gas may be the largest reservoir of baryonic matter in the Universe, but even its existence has not been proven observationally at low z. Two clusters of our sample are being observed as GTO targets and we propose the remaining two.

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