Baryons in intermediate redshift {z > 1} OVI absorbers

Details Baryons in intermediate redshift {z > 1} OVI absorbers Baryons in intermediate redshift {z > 1} OVI absorbers

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9040r&link_type=abstract

HST Proposal ID #9040

Physics

Hst Proposal Id #9040 Quasar Absorption Lines And Igm

Scientific paper

We propose to search for intervening OVI absorption systems in two further extremely UV bright intermediate redshift QSOs {HS 0747 + 4259, z = 1.9, V = 15.6; HS 0818+2554, z = 1.5, V = 15.4} using the STIS E230M Echelle mode. The scientific aim is to measure the baryonic fraction in the warm-hot intergalactic medium at redshifts 1 <=q z <=q 1.8. Present existing data on HE 0515-4414 taken also with STIS E230M seem to indicate that the baryonic fraction at z = 1.5 is lower by a factor of 15 than the high value found by Tripp et al. {2000} for z < 0.3. Our results need to be confirmed by more lines of sight, and we plan to test hierarchical structure formation models which predict a rapid evolution between z = 1.5 and z = 0.

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