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

Abstract

We report the first detection of the 6.2micron and 7.7micron infrared `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 ultraluminous infrared galaxies and in local PG QSOs, supporting a predominantly starburst nature of the Cloverleaf's huge far-infrared luminosity (5.4E12 Lsun, corrected for lensing). The Cloverleaf's period of dominant QSO activity (Lbol ~ 7E13 Lsun) is coincident with an intense (star formation rate ~1000 Msun/yr) and short (gas exhaustion time ~3E7yr) star forming event.

arXiv commentAccepted for publication as an ApJ Letter. 14 pages, 3 figures.

References in corpus (40)

• Star Formation in Galaxies Along the Hubble Sequence
• The Host Galaxies of AGN
• Modeling feedback from stars and black holes in galaxy mergers
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• The Infrared Spectrograph on the Spitzer Space Telescope
• A Redshift Survey of the Submillimeter Galaxy Population
• What Powers Ultra-luminous IRAS Galaxies?
• A Physical Model for the Co-evolution of QSOs and of their Spheroidal Hosts
• Molecular Gas at High Redshift
• An interferometric CO survey of luminous submm galaxies
• The SMART Data Analysis Package for the Infrared Spectrograph on the Spitzer Space Telescope
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• The Mid-IR Properties of Starburst Galaxies from Spitzer-IRS Spectroscopy
• Quasi-Stellar Objects, Ultraluminous IR Galaxies, and Mergers
• First detection of [CII]158um at high redshift: vigorous star formation in the early universe
• Spitzer Quasar and ULIRG evolution study (QUEST): I. The origin of the far infrared continuum of QSOs
• Near Infrared Spectroscopy of High Redshift Active Galactic Nuclei. I. A Metallicity-Accretion Rate Relationship
• Gas and Dust in the Cloverleaf Quasar at Redshift 2.5
• The Detection of Silicate Emission from Quasars at 10 and 18 Microns
• Hyperluminous Infrared Galaxies
• The distribution of silicate strength in Spitzer spectra of AGNs and ULIRGs
• Is HCN a True Tracer of Dense Molecular Gas in LIRGs and ULIRGs?
• High-redshift radio galaxies and quasars at sub-millimetre wavelengths: assessing their evolutionary status
• [O II] Emission in Quasar Host Galaxies: Evidence for a Suppressed Star Formation Efficiency
• Multiple CO Transitions, CI, and HCN from the Cloverleaf Quasar
• A 1.2mm MAMBO/IRAM-30m Study of Dust Emission from optically luminous z~2 Quasars
• The Host Galaxies of Optical Bright QSOs: Molecular Gas in Z < 0.1 PG-QSOs
• Dense Molecular Gas and the Role of Star Formation in the Host Galaxies of Quasi-Stellar Objects
• Mid-infrared Spitzer spectra of X-ray selected Type 2 QSOs: QSO2s are not ULIRGs
• Mid-infrared spectroscopy of two luminous submillimeter galaxies at z~2.8
• The essential signature of a massive starburst in a distant galaxy
• The SCUBA Bright Quasar Survey II: unveiling the quasar epoch at submillimetre wavelengths
• A Submillimeter Survey of Gravitationally Lensed Quasars
• A Search for Dense Molecular Gas in High Redshift Infrared-Luminous Galaxies
• A New Probe of Dense Gas at High Redshift: Detection of HCO+(5-4) Line Emission in APM 08279+5255
• Millimeter Interferometric Investigations of the Energy Sources of Three Ultraluminous Infrared Galaxies, UGC 5101, Mrk 273, and IRAS 17208-0014, based on HCN to HCO+ Ratios
• Detection of HNC and tentative detection of CN at z=3.9
• First Detection of HCO+ Emission at High Redshift
• Silicate Emission in the Spitzer IRS spectrum of FSC 10214+4724
• The Molecular Disk in the Cloverleaf Quasar

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