A Population of Dust-Rich Quasars at z ~ 1.5
  We report Herschel SPIRE (250, 350, and 500 micron) detections of 32 quasars
with redshifts 0.5 < z < 3.6 from the Herschel Multi-tiered Extragalactic
Survey. These sources are from a MIPS 24 micron 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 25K to 60K, with a mean of
34K. The FIR luminosities range from 10^{11.3} to 10^{13.5} Lsun, 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
micron, rest-frame), and the bolometric luminosities derived using the 5100 A
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.
