A Connection between Obscuration and Star Formation in Luminous Quasars

Abstract

We present a measurement of the star formation properties of a uniform sample of mid-IR selected, unobscured and obscured quasars (QSO1s and QSO2s) in the Boötes survey region. We use an spectral energy distribution (SED) analysis for photometric data spanning optical to far-IR wavelengths to decompose AGN and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have higher far-IR detection fractions, far-IR fluxes and infrared star formation luminosities ($L_{\mathrm{IR}}^{\mathrm{SF}}$) by a factor of $\sim 2$. Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between $4-40\times 10^{11}{L}_{\odot }$. We also find evidence associating the absorption in the X-ray emission with the presence of far-IR emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscurations can be associated with a dust-enshrouded starburst galaxies.

arXiv comment15 pages, 8 figures, accepted for publication in ApJ

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