Alpha Element Enrichment in Damped Lyman Alpha Absorbers: Survey for New Targets

Details Alpha Element Enrichment in Damped Lyman Alpha Absorbers: Survey for New Targets Alpha Element Enrichment in Damped Lyman Alpha Absorbers: Survey for New Targets

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1742b&link_type=abstract

Chandra Proposal ID #06700348

Physics

Chandra Proposal Id #06700348

Scientific paper

We propose short 3 ksec exposures to measure the X-ray fluxes of two quasars from the Sloan Digital Sky Survey which were recently discovered to have very high column density damped lyman alpha (DLYA) absorbers in their spectra. If the X-ray fluxes are high enough, longer exposures will be proposed to detect X-ray absorption associated with the DLYAs. Oxygen and the alpha-process elements are the main contributors to the X-ray cross-section. Oxygen is produced primarily by massive stars which evolve on much shorter timescales than the lower-mass progenitors of Type Ia SNe, thought to be the major source of iron group elements such as zinc measured in the UV. The alpha/Fe ratio will allow us to investigate the nucleosynthetic history of these redshifted galaxies.

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