Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9165w&link_type=abstract
HST Proposal ID #9165
Physics
Hst Proposal Id #9165 Quasar Absorption Lines And Igm
Scientific paper
Damped LyAlpha absorption systems hold key information about galaxy formation and chemical evolution of the universe. We propose to conduct spatially resolved absorption line spectroscopy in the only presently known DLA system with two independent lines of sight. This object was discovered recently by us in the course of an ongoing HST snapshot survey as a double QSO at z=1.57 with an image separation of only 0.63 arcsec, almost certainly due to gravitational lensing. The ground-based composite optical spectrum shows an exceptionally strong Mg II+ Fe II absorption system at z=0.93, which clearly indicates the presence of a damped LyAlpha absorber {DLA} in the line of sight. Here we propose to obtain direct imaging and medium-resolution spectra in the wavelength range 1700-5700 Angstrom , with the following principal aims: {1} Confirm the gravitational lens {vs. physical binary} hypothesis. {2} Estimate hydrogen column densities N{H I} along both lines of sight, and test competing DLA models. {3} In combination with already granted ESO-VLT observations, measure absolute metal abundances and compare the variation of metallicities between the two lines of sight. {4} Derive the extinction curve and dust properties of the z=0.93 lensing/absorbing galaxy.
No associations
LandOfFree
A Damped LyAlpha System in a Close Separation Lens does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Damped LyAlpha System in a Close Separation Lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Damped LyAlpha System in a Close Separation Lens will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1200618