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A connection between obscuration and star formation in luminous quasars.

Chen, C.-T.J. and Hickox, R.C. and Alberts, S. and Harrison, C.M. and Alexander, D.M. and Assef, R. and Brodwin, M. and Brown, M.J.I. and Del Moro, A. and Forman, W.R. and Gorjian, V. and Goulding, A.D. and Hainline, K.N. and Jones, C. and Kochanek, C.S. and Murray, S.S. and Pope, A. and Rovilos, E. and Stern, D. (2015) 'A connection between obscuration and star formation in luminous quasars.', Astrophysical journal., 802 (1). p. 50.


We present a measurement of the star formation properties of a uniform sample of mid-IR-selected, optically unobscured, and obscured quasars (QSO1s and QSO2s) in the Boötes survey region. We use a spectral energy distribution analysis for photometric data spanning optical to far-IR wavelengths to separate the active galactic nucleus (AGN) and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have roughly twice the far-IR detection fractions, far-IR fluxes, and infrared star formation luminosities ($L_{{\rm IR}}^{{\rm SF}}$). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (4–40) × ${{10}^{11}}{{L}_{\odot }}$. We also find evidence associating X-ray absorption with the presence of far-IR-emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscuration is associated with dust-enshrouded starburst galaxies.

Item Type:Article
Keywords:Galaxies: active, Galaxies: starburst, Infrared: galaxies, Quasars: general, X-rays: galaxies.
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Publisher statement:© 2015. The American Astronomical Society. All rights reserved.
Date accepted:20 January 2015
Date deposited:21 May 2015
Date of first online publication:March 2015
Date first made open access:No date available

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