Baryons in the Warm-hot Intergalactic Medium

Details Baryons in the Warm-hot Intergalactic Medium Baryons in the Warm-hot Intergalactic Medium

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004bdmh.confe...2r&link_type=abstract

"Proceedings of "Baryons in Dark Matter Halos". Novigrad, Croatia, 5-9 Oct 2004. Editors: R. Dettmar, U. Klein, P. Salucci. Publ

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We discuss physical properties and the baryonic content of the Warm-hot Intergalactic Medium (WHIM) at low redshifts. Cosmological simulations predict that the WHIM contains a large fraction of the baryons at z = 0 in the form of highly-ionized gas at temperatures between 105 and 107 K. Using high-resolution ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph (STIS) and the Far Ultraviolet Spectroscopic Explorer (FUSE) we have studied the WHIM at low redshifts by searching for intervening O V I and thermally broadened Lyman α (BL) absorption toward a number of quasars and active galactic nuclei (AGNs). Our measurements imply cosmological mass densities of ?b (O V I)≈ 0.0027 h-1 and ?b (BL)≈ 0.0058 h-1. Our 75 75 results suggest that the WHIM at low z contains more baryonic mass than stars and gas in galaxies.

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