A Search for the Missing Baryons in Nearby Cosmic Filaments

Details A Search for the Missing Baryons in Nearby Cosmic Filaments A Search for the Missing Baryons in Nearby Cosmic Filaments

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9858d&link_type=abstract

HST Proposal ID #9858

Computer Science

Hst Proposal Id #9858 Quasar Absorption Lines And Igm

Scientific paper

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 warm-hot low density phase, largely in the 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 and observations of two AGNs behind known superclusters showed multiple LyAlpha absorption systems at the supercluster redshift. These results are impressive considering that these AGNs were not even optimally located. Here we selected a several AGNs that lie close to the expected central axis of supercluster filaments. These HST observations will identify LyAlpha absorbing gas while a complementary FUSE program will search for OVI gas in the same systems.

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