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Title of Journal: Astrophys Space Sci

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Abbravation: Astrophysics and Space Science

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Springer Netherlands

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DOI

10.1007/bf01656813

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1572-946X

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The fraction and midinfrared properties of broad

Authors: Xingting Pu
Publish Date: 2013/10/30
Volume: 349, Issue: 2, Pages: 947-955
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Abstract

We present the results of a study which uses a sample of 1822 Sloan Digital Sky Survey SDSS quasars with reliable Widefield Infrared Survey Explorer WISE detections in the redshift range 17≤z≤438 to investigate the midinfrared fraction of broad absorption line BAL quasars The BAL quasars in the sample include both highionization BAL HiBAL quasars that show broad absorption from C iv and lowionization BAL LoBAL quasars that show additional broad absorption from Mg ii The fraction of C iv BAL quasars with nonzero absorption index AI is found to be 387±12  in good agreement with that derived for the Two Micron All Sky Survey 2MASS sample The C iv BAL quasar fractions remain constant with magnitude in the WISE 34 μm W1 and 46 μm W2 bands and increase rapidly with decreasing magnitude in the WISE 12 μm W3 and 22 μm W4 bands The nonzero AI fraction of 445±21  determined in the WISE W4 band is more likely to represent the intrinsic BAL quasar fraction No evidence that the fraction is a strong function of redshift is found At 17≤z≤215 the overall midinfrared LoBAL fraction is 33+06 05~ and the fractions increase significantly with decreasing magnitude in all four of WISE bands Moreover it is found that the mean opticaltoWISE colors of BAL quasars are ≃02 mag redder than that of nonBAL quasars while the traditional nonzero balnicity BAL quasars are redder than the nontraditional BAL quasars by ≃015 mag which suggest a continuum of more reddening from nonBAL to nontraditional BAL to traditional BAL No evidence that nontraditional BALs are a distinct class from traditional BALs is found Finally it is shown that the mean opticaltoWISE colors of LoBALs are ≃04 mag redder than that of HiBALs at 17≤z≤215The author would like to thank the anonymous referee for comments and suggestions which significantly improved the final version of this manuscript This publication makes use of data products from the Widefield Infrared Survey Explorer which is a joint project of the University of California Los Angeles and the Jet Propulsion Laboratory/California Institute of Technology funded by the National Aeronautics and Space Administration

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