Statistics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348204d&link_type=abstract
American Astronomical Society, AAS Meeting #213, #482.04; Bulletin of the American Astronomical Society, Vol. 41, p.450
Statistics
Scientific paper
Several factors are thought to affect the evolution of gas in the intergalactic medium (IGM) throughout the history of the universe: (1) the changing AGN radiation field; (2) the injection of metals by galaxies; and (3) the formation of large-scale structure. Numerical simulations predict and UV observations confirm a drop in the baryon fraction in the warm, photo-ionized phase (the Ly\alpha forest), from nearly 100% at zgt;24; to approximately 30% at z=0. The remainder of the low-z baryons are predicted to reside in warm-hot IGM (WHIM) (at T=10^5 to 10^7 K) as well in hotter gas in deep cluster potentials. Several HST and FUSE surveys of the low-redshift (z<0.5) IGM have produced extensive catalogs of metal-line and H I absorption systems, which we have compared to those at higher redshifts. The detection statistics are sufficiently high that, in several cases, we can subdivide the low-z sample into several redshift bins. By comparing the observed absorber frequency of HI, OVI, CIV, SiIV and other ions with those from the literature at z=1-4, we believe to detect the predicted redshift evolution in HI and OVI absorbers, particularly at z<0.1.
Danforth Charles
Shull J.
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