Probing a damped Lyman-alpha system along two lines of sight

Details Probing a damped Lyman-alpha system along two lines of sight Probing a damped Lyman-alpha system along two lines of sight

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10223m&link_type=abstract

HST Proposal ID #10223

Computer Science

Hst Proposal Id #10223 Quasar Absorption Lines/Igm

Scientific paper

Damped Lyman-alpha absorption systems hold key information about galaxy formation and chemical evolution of the Universe. We have recently discovered that the bright {V = 15.5} z=1.07 quasar HS 2209+1914 is a gravitationally lensed double with an image separation of 1.0 arcsec and a clearly detected lensing galaxy. A strong Mg II and Fe II absorption systems at z=0.51 is very suggestive of a common damped Ly-alpha absorber {DLA} in both lines of sight, presumably identical with the lensing galaxy. We propose to obtain UV spectroscopy of both QSO components, with the principal aim to confirm the DLA hypothesis and obtain the column density of neutral hydrogen along both lines of sight. This will enable future high-resolution spectroscopy to determine elemental abundances and their spatial variance between different locations in the absorber. In combination with new ground-based deep infrared images, HS 2209+1914 will be the only known DLA galaxy where spatially resolved abundance information can be directly related to the observed distribution of stellar light. Byproducts of our study will include new insights into the lensing geometry of the system, a high S/N measurement of differential extinction through the lensing galaxy, and an estimate of the lensing galaxy's extinction curve.

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