Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars

Details Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars

2007-05-03

arxiv.org/abs/0705.0538v1

Astrophys.J.665:157-173,2007

Astronomy and Astrophysics

Astrophysics

21 pages, LaTeX, uses emulateapj. 12 figures (2 color). Accepted for publication in ApJ

Scientific paper

10.1086/519438

We have compiled the largest sample of multiwavelength spectral energy distributions (SEDs) of Broad Absorption Line (BAL) quasars to date, from the radio to the X-ray. We present new Spitzer MIPS (24, 70, and 160 micron) observations of 38 BAL quasars in addition to data from the literature and public archives. In general, the mid-infrared properties of BAL quasars are consistent with those of non-BAL quasars of comparable luminosity. In particular, the optical-to-mid-infrared luminosity ratios of the two populations are indistinguishable. We also measure or place upper limits on the contribution of star formation to the far-infrared power. Of 22 (57%) upper limits, seven quasars have sufficiently sensitive constraints to conclude that star formation likely contributes little (<20%) to their far-infrared power. The 17 BAL quasars (45%) with detected excess far-infrared emission likely host hyperluminous starbursts with L_fir,SF=10^{13-14} L_sun. Mid-infrared through X-ray composite BAL quasar SEDs are presented, incorporating all of the available photometry. Overall, we find no compelling evidence for inherent differences between the SEDs of BAL vs. non-BAL quasars of comparable luminosity. Therefore a ``cocoon'' picture of a typical BAL quasar outflow whereby the wind covers a large fraction of the sky is not supported by the mid-infrared SED comparison with normal quasars, and the disk-wind paradigm with a typical radio-quiet quasar hosting a BAL region remains viable.

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