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.; Pérez-Fournon, I.; Rigopoulou, Dimitra; Roseboom, Isaac G.; Scott, Douglas; Symeonidis, Myrto; Trichas, Markos; Vieira, Joaquin D.; Willmer, Christopher N. A.; Zemcov, Michael
Bibliographical reference
The Astrophysical Journal, Volume 753, Issue 1, article id. 33 (2012).
Description
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 25-60 K, with a mean of 34 K. The FIR
luminosities range from 1011.3 to 1013.5 L
&sun;, 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 ~1 mm. However, their FIR
properties cannot be predicted from shorter wavelengths (0.3-20 μm,
rest frame), and the bolometric luminosities derived using the 5100
Å 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.
Related projects
Formation and Evolution of Galaxies: Observations in Infrared and other Wavelengths
This IAC research group carries out several extragalactic projects in different spectral ranges, using space as well as ground-based telescopes, to study the cosmological evolution of galaxies and the origin of nuclear activity in active galaxies. The group is a member of the international consortium which built the SPIRE instrument for the