AAS 205th Meeting, 9-13 January 2005
Session 145 Intergalactic Media
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

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[145.04] Searching for OVI Absorbtion Systems toward PKS1302-102

K. L. Cooksey (UC, Santa Cruz), J. X. Prochaska (UCO/Lick Observatory)

The baryonic content of the Universe is well known from Big Bang nucleosynthesis models, deuterium abundances, and the high-redshift Lyman-\alpha 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 (\delta~0-30), 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 \lambda\lambda1031.93, 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\mathrm{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.

If you would like more information about this abstract, please follow the link to http://www.ucolick.org/\~{}kcooksey/OVIabs.html. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.