Fe II emission lines as a chronometer for high-redshift quasars

Details Fe II emission lines as a chronometer for high-redshift quasars Fe II emission lines as a chronometer for high-redshift quasars

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..301e&link_type=abstract

NOAO Proposal ID #2000A-0301

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We have embarked on a project to fully simulate the physical conditions within Fe II-emitting gas, and predict the resulting spectrum. The first steps of generating the initial atomic database, and incorporating it into the photoionization code CLOUDY, are complete. Here we request echelle observations of the symbiotic star RR Telescopii (RR Tel), to combine with HST/STIS data to give the first complete coverage of Fe II emission lines in the 1150-10000 Arange. The Fe II emitting regions in symbiotics have similar physical conditions to those in active galaxies, and hence the RR Tel observations will provide a testbed for our Fe II numerical simulations. Analysis of the RR Tel data using CLOUDY will allow us to check the reliability and completeness of the atomic data and processes considered, to investigate the sensitivity of emission to temperature and density variations, and to assess the importance of blending. Once calibrated against the RR Tel data, we will use our Fe II simulations to deduce iron abundances in high-redshift quasars. This, in conjunction with predictions of stellar evolution and galactic nucleosynthesis, will result in a chronometer measuring the redshift when the universe passed through an age of 1 Gyr, thus constraining several cosmological parameters.

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