Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..441k&link_type=abstract
NOAO Proposal ID #2009A-0441
Other
Scientific paper
Absorption lines in quasar spectra offer a powerful tool to study the chemical composition of galaxies and intergalactic matter (IGM). Gravitationally lensed quasars (GLQs) and binary quasars (BQs) offer a probe of the internal structure of interstellar material (ISM) in galaxies. BQs also offer a tool for studying galaxies and IGM in high- density regions. Unfortunately, very little information exists on the metal and dust content of absorbers located in front of GLQs/BQs. We set out to increase the sample of multiply probed absorber galaxies in a very highly ranked 2008A MMT program, but lost most of the time to bad weather. Here we propose to continue this effort by obtaining spatially resolved high S/N MMT spectra of 2-4 sightlines each through 10 absorbers at 0.3 < z < 1.1. The proposed observations will (1) substantially increase the sightlines separated on small (5-25 kpc) scales; (2) allow measurements of sizes of the lenses and other absorbers; (3) allow study of abundance gradients in the absorbing galaxies, and (4) probe variation of interstellar dust properties. The MMT blue channel spectrograph is essential to obtain the necessary combination of wavelength coverage, S/N, and resolution for detecting the crucial metal lines (Zn, Cr, Fe, Mn, Mg, Ti etc.).
Ellison Sara
Kulkarni Varsha P.
Lopez Sebastian
Som Debopam
Torres Legna
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