A population of dust-rich quasars at z ∼ 1.5

Y. Sophia Dai, Jacqueline Bergeron, Martin Elvis, Alain Omont, Jia Sheng Huang, Jamie Bock, Asantha Cooray, Giovanni Fazio, Evanthia Hatziminaoglou, Edo Ibar, Georgios E. Magdis, Seb J. Oliver, Mathew J. Page, Ismael Perez-Fournon, Dimitra Rigopoulou, Isaac G. Roseboom, Douglas Scott, Myrto Symeonidis, Markos Trichas, Joaquin D. VieiraChristopher N.A. Willmer, Michael Zemcov

Research output: Contribution to journalArticlepeer-review

Abstract

We report Herschel SPIRE (250, 350, and 500 μm) detections of 32 quasars with redshifts 0.5 ≤z < 3.6 from the Herschel Multi-tiered Extragalactic Survey (HerMES). These sources are from a MIPS 24 μm flux-limited sample of 326 quasars in the Lockman Hole Field. The extensive multi-wavelength data available in the field permit construction of the rest-frame spectral energy distributions (SEDs) from ultraviolet to the mid-infrared for all sources, and to the far-infrared (FIR) for the 32 objects. Most quasars with Herschel FIR detections show dust temperatures in the range of 25-60K, with a mean of 34K. The FIR luminosities range from 1011.3 to 1013.5 L, qualifying most of their hosts as ultra- or hyper-luminous infrared galaxies. These FIR-detected quasars may represent a dust-rich population, but with lower redshifts and fainter luminosities than quasars observed at 1mm. However, their FIR properties cannot be predicted from shorter wavelengths (0.3-20 μm, rest frame), and the bolometric luminosities derived using the 5100Å index may be underestimated for these FIR-detected quasars. Regardless of redshift, we observed a decline in the relative strength of FIR luminosities for quasars with higher near-infrared luminosities.

Original languageEnglish (US)
Article number33
JournalAstrophysical Journal
Volume753
Issue number1
DOIs
StatePublished - Jul 1 2012

Keywords

  • galaxies: active
  • galaxies: nuclei
  • galaxies: starburst
  • infrared: galaxies
  • quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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