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A connection between obscuration and star formation in luminous quasars

Lookup NU author(s): Dr Christopher HarrisonORCiD


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© 2015. The American Astronomical Society. All rights reserved. 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 Boötessurvey 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 (LIR SF). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (440) 1011LO. 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.

Publication metadata

Author(s): Chen C-TJ, Hickox RC, Alberts S, Harrison CM, Alexander DM, Assef R, Brodwin M, Brown MJI, Moro AD, Forman WR, Gorjian V, Goulding AD, Hainline KN, Jones C, Kochanek CS, Murray SS, Pope A, Rovilos E, Stern D

Publication type: Article

Publication status: Published

Journal: Astrophysical Journal

Year: 2015

Volume: 802

Issue: 1

Online publication date: 20/03/2015

Acceptance date: 20/01/2015

ISSN (print): 0004-637X

ISSN (electronic): 1538-4357

Publisher: Institute of Physics Publishing


DOI: 10.1088/0004-637X/802/1/50


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