The Pattern of Heavy Element Abundances in a High Redshift Galaxy

Physics

Scientific paper

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Chandra Proposal Id #03700232

Scientific paper

We propose to measure the X-ray absorbing column associated with the intervening z=2.04 absorption line system of PKS 0458-020. We estimate that an accurate measurement can be made if the O/H is 1/8 solar or greater. Oxygen and the alpha-process elements are the main contributors to the X-ray cross-section; this will be the first measurement of their abundance in any high redshift galaxy. We will see directly whether the absorber shares the same nucleosynthetic history as the Pop II metal-poor halo stars and globular clusters of the Milky Way, or whether it has an abundance pattern like current-day disk stars and gas.

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