NOAO >   Observing Info >   Approved Programs >   2006A-0083

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Proposal Information for 2006A-0083


PI: Jack Baldwin, Michigan State University, baldwin@pa.msu.edu
Address: Physics Department, 3270 Biomedical Physical Sciences Building, East Lansing, MI 48824, USA

CoI: Patrick Osmer, The Ohio State University
CoI: Misty Bentz, The Ohio State University
CoI: Neelam Dhanda, Michigan State University
CoI: Gary Ferland, University of Kentucky

Title: High-Metallicity QSOs

Abstract: QSOs at redshifts z ~ 2-3 offer an important path to measuring the early chemical evolution of galaxies. Their broad emission lines are produced by gas that presumably has fallen in from the central regions of the surrounding proto-galaxy, after participating in the chemical evolution of the ISM up to that point. The aim of this investigation is to capture chemical abundance information for the few known galactic nuclei that have gone all the way through the rapid chemical evolution that is expected to occur in dense galaxy cores, but which are also still in a phase of feeding gas into the central engine so that a luminous QSO is visible. The observations proposed here will expand the number of such known objects from one to five. This requires a precision abundance analysis for four new SDSS quasars that we have identified as having anomalously strong nitrogen emission lines, for which we need to obtain Gemini and Mayall spectra. We will use the same analysis technique that we have successfully used on Q0353-383, the only such object which has previously been studied. For Q0353-383 we found a metallicity ~ 20\times solar, and we wish to see if similarly high metal abundances have been reached in other objects.


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NOAO >   Observing Info >   Approved Programs >   2006A-0083

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