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 |
Abstract
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 |
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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 |
URI: | https://orca.cardiff.ac.uk/id/eprint/56660 |
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