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- W4387389629 abstract "In the standard quasar model, the accretion disk obscuration is due to the canonical dusty torus. Here, we argue that a substantial part of the quasar obscuration can come from the interstellar medium (ISM) when the quasars are embedded in compact starbursts. We use an obscuration-unbiased sample of 578 infrared (IR) quasars at $zapprox 1-3$ and archival ALMA submillimeter host galaxy sizes to investigate the ISM contribution to the quasar obscuration. We calculate SFR and ISM column densities for the IR quasars and a control sample of submillimeter galaxies (SMGs) not hosting quasar activity and show that: (1) the quasar obscured fraction is constant up to $rm SFRapprox 300 : M_{odot} : yr^{-1}$, and then increases towards higher SFR, suggesting that the ISM obscuration plays a significant role in starburst host galaxies, and (2) at $rm SFRgtrsim 300 : M_{odot} : yr^{-1}$, the SMGs and IR quasars have similarly compact submillimeter sizes ($R_{rm e}approx 0.5-3rm : kpc$) and, consequently, the ISM can heavily obscure the quasar, even reaching Compton-thick ($N_{rm H}>10^{24} rm : cm^{-2}$) levels in extreme cases. Based on our results, we infer that $approx 10-30%$ of the IR quasars with $rm SFRgtrsim 300 : M_{odot} : yr^{-1}$ are obscured solely by the ISM." @default.
- W4387389629 created "2023-10-06" @default.
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- W4387389629 date "2023-10-03" @default.
- W4387389629 modified "2023-10-09" @default.
- W4387389629 title "Obscuration beyond the nucleus: infrared quasars can be buried in extreme compact starbursts" @default.
- W4387389629 doi "https://doi.org/10.48550/arxiv.2310.02330" @default.
- W4387389629 hasPublicationYear "2023" @default.
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