Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21641707s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #417.07; Bulletin of the American Astronomical Society, Vol. 41, p.829
Astronomy and Astrophysics
Astronomy
Scientific paper
Quasar absorption line systems offer a unique window into the high redshift universe providing useful information about galaxy formation and evolution. The damped Lyman-alpha absorbers (DLAs) and sub-DLAs contain the majority of neutral gas in galaxies at high redshift. They also allow a direct determination of interstellar element abundances in galaxies as a function of redshift. Our recent studies indicate, surprisingly, that the sub-DLAs appear to be more metal-rich than the DLAs, especially at low redshifts. The differences between DLAs and sub-DLAs pose open questions regarding the chemical evolution of galaxies. To explore the answers, we aim to expand the sets of element abundance data for DLAs and sub-DLAs. We have therefore recently observed 15 more absorbers at redshifts z > 1.7 using the MIKE spectrograph at the 6.5 meter Magellan Clay telescope. We will present observational data from this study for a few high redshift DLAs and sub-DLAs.
Khare Pushpa
Kulkarni Varsha P.
Lauroesch James
Meiring Joseph
Peroux Celine
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