Finding the Baryons in the Low Redshift Universe.

Details Finding the Baryons in the Low Redshift Universe. Finding the Baryons in the Low Redshift Universe.

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..673m&link_type=abstract

Chandra Proposal ID #02700728

Mathematics

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Chandra Proposal Id #02700728

Scientific paper

Recent estimates of the primordial deuterium abundance, combined with the theory of big bang nucleosynthesis (BBN), imply a baryon density parameter Omega_b ≈ 0.04 h_{70}(-2) . The main reservoir of low redshift baryons is still ``missing''. All the observed stellar and gaseous components add up to only Omega_b ≈ 0.004h_{70}(-1) , a factor of ten below the BBN abundance. Hydrodynamic cosmological simulations predict that a large fraction of the low redshift baryons should reside in a hot diffuse intergalactic medium (IGM). We propose to exploit the excellent spectral resolution of Chandra gratings to probe the low redshift IGM with sensitive X-ray spectroscopy. We expect to detect the main reservoir of low redshift baryons with observations of OVII absorption lines.

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