NOAO >   Observing Info >   Approved Programs >   2010A-0244

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Proposal Information for 2010A-0244


PI: William C. Keel, University of Alabama, wkeel@bama.ua.edu
Address: Physics Department, Box 870324, Tuscaloosa, AL 35487, USA

CoI: Kevin Schawinski, Yale University
CoI: Chris Lintott, Oxford University
CoI: Vardha Nicola Bennert, UC Santa Barbara
CoI: Millicent Maier, Gemini Observatory

Title: The Galaxy Zoo sample of AGN-ionized clouds - history and obscuration

Abstract: AGN are capable of ionizing gas on large (often galaxy-wide) scales, with the ionization often tracing a cone the parameters of which are defined by the geometry of obscuring material near the nucleus. Observing instances of such ionized gas thus provides information on the extent of such obscuration as well as constraining the timescale for strong variability of the AGN. The Galaxy Zoo project has found approximately 100 new examples of strongly ionized gas in AGN, selected via inspection of colour SDSS images. Many of these new examples are, despite their lack of follow-up to date, as large and luminous as anything in the literature. This proposal would obtain long-slit spectra to confirm potentially ionized targets through the study of emission from diagnostic lines. This results will provide a immediate survey of the ionization mechanisms involved and hence the implied AGN luminosity, but would also allow us to filter the source list for future 2D spectroscopy and X-ray observations.


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 >   2010A-0244

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