Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9186w&link_type=abstract
HST Proposal ID #9186
Computer Science
Hst Proposal Id #9186 Quasar Absorption Lines And Igm
Scientific paper
The deuterium abundance in QSO absorbers provides a direct measurement of the baryonic density of the Universe. We will use STIS to obtain new high resolution data of two carefully selected, intermediate redshift absorption systems. Existing FOS data constrain the velocity structure of these systems and show that the high neutral hydrogen column densities are high enough detect deuterium in the new higher resolution observations we propose here. Markarian 132, z{abs} = 1.7306: The FOS G270 spectrum covers the whole Lyman series from Ly-beta down to the limit. Voigt profile fitting to the whole series reveals two strong components but the system is dominated by a cloud with logN{HI} = 18.3 +/- 0.1 which lies at the blue edge of the complex. The velocity spread within this component is b{eff} < 50 km/s. Ton 34, z{abs} = 1.6077: This is a grey Lyman limit system. The Ly-alpha profile looks fairly narrow. Fitting Voigt profiles to the whole series gives logN{HI} = 17.4 +/- 0.1 and b{eff} < 39 km/s so this system may be a single component system.
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