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We report the first detection of the 6.2 and 7.7 μm infrared polycyclic aromatic hydrocarbon (PAH) emission features in the spectrum of a high-redshift QSO, from the Spitzer IRS spectrum of the Cloverleaf lensed QSO (H1413+117, z ~ 2.56). The ratio of PAH features and rest-frame far-infrared emission is the same as in lower luminosity star-forming ULIRGs and in local PG QSOs, supporting a predominantly starburst nature of the Cloverleaf's huge far-infrared luminosity (5.4 × 10 12 L ☉ , corrected for lensing). The Cloverleaf's period of dominant QSO activity ( L Bol ~ 7 × 10 13 L ☉ ) is coincident with an intense (star formation rate ~1000 M ☉ yr -1 ) and short (gas exhaustion time ~3 × 10 7 yr) star-forming event.
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A 2007 study studied this question.
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