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

被引：47

作者：

Lutz, D. ^{[1
]}

Sturm, E.

Tacconi, L. J.

Valiante, E.

Schweitzer, M.

Netzer, H.

Maiolino, R.

Andreani, P.

Shemmer, O.

Veilleux, S.

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[2] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[3] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Wise Observ, IL-69978 Tel Aviv, Israel

[4] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[5] ESO, D-85748 Garching, Germany

[6] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[7] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 661卷 / 01期

关键词：

galaxies : active; galaxies : starburst; infrared : galaxies;

D O I：

10.1086/518537

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first detection of the 6.2 and 7.7 mu m 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 similar to 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 x 10(12) L-circle dot, corrected for lensing). The Cloverleaf's period of dominant QSO activity (L-Bol similar to 7 x 10(13) L-circle dot) is coincident with an intense (star formation rate similar to 1000 M-circle dot yr(-1)) and short (gas exhaustion time similar to 3 x 10(7) yr) star-forming event.

引用

页码：L25 / L28

页数：4

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