Obtaining FeII/MgII flux ratios in Low-Redshift QSOs

Details Obtaining FeII/MgII flux ratios in Low-Redshift QSOs Obtaining FeII/MgII flux ratios in Low-Redshift QSOs

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...37k&link_type=abstract

NOAO Proposal ID #2001A-0037

Physics

Scientific paper

A delay of ~ 1.5 Gyr in Fe enrichment, relative to Mg ((alpha) element), might provide a chronometer for measuring the age of quasars and then constraining the age of the Universe. We are carrying out a project to do spectroscopy of many quasars from low-redshift to high-redshift in order to obtain the relation of the FeII/MgII flux ratio versus redshift. Combining this relation with the models of chemical evolution of galaxies, we would be able to know:(1)whether or not Fe is overabundant in broad-line gas of low-redshift quasars, (2)how quasar host galaxies formed, (3)the epoch of host galaxy formation, (4)the age of quasars, and eventually (5)the age of the Universe. As part of this project, we propose to do optical spectroscopy of 20 low- redshift quasars by using the GoldCam Spectrometer on KPNO-2.1m telescope. These optical spectra will be combined FOS UV spectra to extract broad FeII emission feature in the UV.

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