Other
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..170s&link_type=abstract
XMM-Newton Proposal ID #02032401
Other
Pks 2351-154, Xmm-Newton Proposal 02032401
Scientific paper
PKS 2351-154 is the only known high redshifted quasar (z2.665) which shows dramatic changes in X-ray flux as well as in its absorbing column density in the UV and X-ray regime. The most likely explanation is provided by a warm absorber located in the local environment of the active nucleus. As warm absorbers strongly reflect the metallicity, the observations proposed here open a unique chance to determine the metallicity of the material accreting into the central massive black hole of a quasar from the ``quasar age''. Comparing the proposed observation with different measurements of other (warm absorbed) quasars of the metal enrichment as function of the redshift can be studied and the physical conditions of the local environment of the black hole can be compared.
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