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PAH emission and star formation in the host of the z ~ 2.56 Cloverleaf QSO

Lutz, D., Sturm, E., Tacconi, L. J., Valiante, Elisabetta, Schweitzer, M., Netzer, H., Maiolino, R., Andreani, P., Shemmer, O. and Veilleux, S. 2007. PAH emission and star formation in the host of the z ~ 2.56 Cloverleaf QSO. The Astrophysical Journal 661 (1) , L25. 10.1086/518537

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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 × 1012 L☉, corrected for lensing). The Cloverleaf's period of dominant QSO activity (LBol ~ 7 × 1013 L☉) is coincident with an intense (star formation rate ~1000 M☉ yr-1) and short (gas exhaustion time ~3 × 107 yr) star-forming event.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: IOP Publishing
ISSN: 0004-637X
Last Modified: 08 Jan 2020 04:36

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