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R. A. Dupke, J. N. Bregman, E. D. Miller (University of Michigan)
Most of the baryons in the local universe are ``missing" in that they are not in galaxies or in the previously detected gaseous phases. These missing baryons are predicted to be in a moderately hot phase, 105-107 K, largely in the form of giant cosmic filaments that connect the denser virialized clusters and groups of galaxies. Models show that the highest covering fraction of such filaments occurs in superclusters. To determine whether such filaments exist, we have examined the UV absorption line properties of three AGNs projected behind possible filaments in superclusters of galaxies. All three show absorption at redshifts within about 1200 km/s of the nearby galaxy clusters that would define the closest filaments. The AGNs are within 3 Mpc of the centerlines of linear filaments between the rich clusters. For one AGN, the absorption line redshifts are close to the emission line redshift of the AGN, so we cannot rule out self-absorption in that case.
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The author(s) of this abstract have provided an email address for comments about the abstract: rdupke@umich.edu
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.