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 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2005b&link_type=abstract

Chandra Proposal ID #07700742

Physics

Chandra Proposal Id #07700742

Scientific paper

We propose short 3 ksec exposures to measure the X-ray fluxes of four quasars which were recently discovered to have very high column density damped Lyman alpha (DLYA) absorbers in their ultraviolet 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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