A POPULATION OF DUST-RICH QUASARS AT z similar to 1.5

作者:Dai Y Sophia*; Bergeron Jacqueline; Elvis Martin; Omont Alain; Huang Jia Sheng; Bock Jamie; Cooray Asantha; Fazio Giovanni; Hatziminaoglou Evanthia; Ibar Edo; Magdis Georgios E; Oliver Seb J; Page Mathew J; Perez Fournon Ismael; Rigopoulou Dimitra; Roseboom Isaac G; Scott Douglas; Symeonidis Myrto; Trichas Markos; Vieira Joaquin D; Willmer Christopher N A; Zemcov Michael
来源:Astrophysical Journal, 2012, 753(1): 33.
DOI:10.1088/0004-637X/753/1/33

摘要

We report Herschel SPIRE (250, 350, and 500 mu m) detections of 32 quasars with redshifts 0.5 %26lt;= z %26lt;= 3.6 from the Herschel Multi-tiered Extragalactic Survey (HerMES). These sources are from a MIPS 24 mu m 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 25-60 K, with a mean of 34 K. The FIR luminosities range from 10(11.3) to 10(13.5) L-circle dot, 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 similar to 1 mm. However, their FIR properties cannot be predicted from shorter wavelengths (0.3-20 mu m, rest frame), and the bolometric luminosities derived using the 5100 angstrom 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.

  • 出版日期2012-7-1
  • 单位中国地震局