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Paper: Large BALQSO Fractions Inferred from NIR and Radio Surveys: Implication to AGN and Feedback Models
Volume: 460, AGN Winds in Charleston
Page: 120
Authors: Dai, X.; Morabito, L. K.; Shankar, F.; Sivakoff, G. R.; Leighly, K. M.
Abstract: Combining the SDSS, 2MASS, and FIRST surveys, we find large BALQSO fractions in NIR- and radio-detected samples: 20–40% for Hi-BALQSOs, 3–7% for Lo-BALQSOs, and 1.5–2% for FeLoBALs. These fractions are two, 3–5, and 10 times higher than the corresponding fractions observed in the optical bands. Considering the intrinsic obscuration for BALQSOs, we can successfully explain the high BALQSO fractions measured in the NIR and radio detected sample. We also argue that these fractions are closer to the intrinsic fractions for BALQSOs of different species. We find the fractions of BALQSOs drop with increasing radio luminosity, and this can be easily explained using a geometric model. Our Suzaku observations of three FeLoBALs constrain their absorption column densities to be Compton thick. The larger LoBAL/FeLoBAL fractions and column densities inferred from our studies suggest that LoBALs/FeLoBALs can provide similar feedback energy as the more populated HiBALs.
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