Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514504c&link_type=abstract
American Astronomical Society Meeting 205, #145.04; Bulletin of the American Astronomical Society, Vol. 36, p.1590
Mathematics
Logic
Scientific paper
The baryonic content of the Universe is well known from Big Bang nucleosynthesis models, deuterium abundances, and the high-redshift Lyman-α forest. However, surveys of the nearby Universe reveal a dearth of baryons in stars, galaxies, and clusters. Recent cosmological simulations have placed the most likely reservoir of baryons at low redshift---upward of 40%---in moderately overdense (δ ˜10-30), collisionally ionized gas, called the warm-hot intergalactic medium. With temperatures in the range 105-7 K, the WHIM proves tricky to observe. The most reasonable tracer is the OVI doublet λ λ 1031.93, 1037.62 Å, which dominates at ˜3x105 K.
Presented here are preliminary results from analysis of far-ultraviolet FUSE and HST/STIS spectra of the quasar PKS1301-102 (z {em} = 0.286). Column densities and Doppler parameters are measured for metal-line systems, and the redshift density of OVI absorbers is determined. In addition, the FUV spectra are supported by a galaxy survey of the field surrounding PKS1302-102, made at Las Campanas Observatory. These observations will be used to determine whether the OVI absorbers are correlated with galaxies. This work was funded by FUSE grant NAG5-12496.
Cooksey Kathy L.
Prochaska Jason Xavier
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