NOAO >   Observing Info >   Approved Programs >   2012B-0538

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Proposal Information for 2012B-0538


PI: Jesse Rogerson, York Univeristy, rogerson@yorku.ca
Address: Department of Physics and Astronomy, 4700 Keele Street, Toronto, Ontario M3J1P3, Canada

CoI: Patrick Hall, York University
CoI: Paola Rodriguez Hidalgo, York University
CoI: Laura Chajet, York University

Title: Spectroscopic Follow Up of Variable Quasars

Abstract: Outflows are a key facet of accretion physics, but one that is poorly understood. We are studying the time variability of broad absorption line (BAL) quasar outflows to constrain the location(s), dynamics and structure of these outflows, and evaluate their importance as a source of feedback for galaxy formation and (co-)evolution. We have used time-series photometry from SDSS Stripe 82 to confirm that the colours of BAL quasars are more variable than those of non-BAL quasars, due to trough variability. Photometry from Stripe 82 and proposed CFHT imaging can therefore be used to identify candidate BAL quasars with variable absorption troughs as well as previously non-BAL quasars with newly emerged absorption troughs. The same can be done for quasars previously observed spectroscopically in both the original SDSS and SDSS- III DR9. Spectroscopy is needed to confirm and study variability in detail, but photometric pre-selection of candidates makes for efficient spectroscopic followup. We therefore propose to use the Hale/5m or KPNO/4m for spectroscopic followup of quasars with candidate trough variability.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012B-0538

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