Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8127m&link_type=abstract
HST Proposal ID #8127
Computer Science
Hst Proposal Id #8127 Quasar Absorption Lines
Scientific paper
We propose an investigation of the damped LyAlpha line at z_abs = 1.6595 in the gravitationally lensed Cloverleaf QSO, seen in the composite FOS-G270H spectrum of the Cloverleaf. The metal lines of the system have been previously studied along the individual lines of sight using FOS G400H and G570H spectra, which indicate that there are variations in the columns of gas observed among the four sight-lines over scales of 4h^-1 kpc {H_0 = 100h km s^-1 Mpc ^-1, q_0 = 0.5}. We propose STIS observations that will enable us to measure the individual ionH1 column densities in the LyAlpha line along all four sight-lines, the values of which will provide an indication of the size-scale and homogeneity of the structures that give rise to damped LyAlpha systems, important constraints on models for these systems. On these scales, does a damped system resemble a large homogeneous structure, or are there significant column density variations due to inhomogeneities or individual giant hydrogen clouds? The results of the proposed observations will allow us to consider this question. As an added benefit, the STIS observations will at the same time allow us to reobserve the individual Broad Absorption Line spectra of the Cloverleaf components. This information can be compared with earlier HST- FOS G400H and G570H spectra to search for and analyze changes in strength which are known to occur in some BAL systems. Such measurements provide important constraints on BAL outflows.
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