Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135....3s&link_type=abstract
FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic
Other
Photometric, Polarimetric, And Spectroscopic Instrumentation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Hadronic Decays
Scientific paper
Most of the normal baryonic matter of the Universe at high and at low redshift is found in the space between galaxies. The study of this matter at low redshift has required access to ultraviolet spectroscopic space observatories. HST and FUSE have revealed that at low redshift ~30% of the baryons reside in the cool (T~2×104 K) photoionized IGM traced by the Lyman α forest while another ~10-20% might exist in the warm (T~1-9×105 K) portion of the warm-hot IGM. Evidence for the warm gas is provided by some of the O VI absorbers, the Ne VIII absorbers and very broad Lyman alpha absorbers. Understanding the physical conditions in these absorbers is important for reliably determining their baryonic content. The low z IGM is likely to play a crucial role in the evolution of the ~8% of the baryons found in galaxies.
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