Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914913c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.13; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
We outline a strategy to select faint (iAB < 25.5) AGN candidates for spectroscopic targeting in the COSMOS field (Scoville et al. 2007, ApJS, in press). Similar in design to the SDSS QSO selection algorithm outlined by Richards et al. (2002), this selection picks candidates by their nonstellar colors in ubvriz broadband photometry from the Subaru and CFH Telescopes. Although the COSMOS field has been used extensively to survey the galaxy population, QSO optical color selection has not been applied to this faint a level. Since the catalog is complete to magnitude iAB < 25.9, we are testing AGN optical color selection at the Seyfert/QSO boundary all the way out to z 3. While stars are easily identified as the dominant contaminant for bright QSO candidate selection at z < 2, we anticipate a high contamination rate from compact red galaxies, which will lower selection efficiency and make the algorithm more complex. To create our candidate pool, we quantify the behavior of the stellar locus in 4D multicolor space. Objects that stray from the locus significantly are tagged as stellar outliers and potential QSO candidates. With a set of 350 known QSOs (X-ray selected, radio selected, and optically selected from SDSS) and type 1 quasar templates designed by Budavari et al. (2001), we have a “training” data set with which to measure efficiency and completeness as a function of redshift. After initial classification in multicolor space, supplemental morphological selection will be applied to stellar outliers using the Gini coefficient, cross-checked against resolved AGN in the training data set, and a final candidate pool will be determined. Candidates will be observed spectroscopically with the IMACS-spectrograph on the Magellan (Baade) Telescope in Chile. This work was partially supported by NSF's REU program at the Institute for Astronomy, University of Hawaii.
Casey Caitlin M.
Impey Chris David
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