A Population of Dust-Rich Quasars at z ~ 1.5
Abstract
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.
Keywords
Cite
@article{arxiv.1205.1808,
title = {A Population of Dust-Rich Quasars at z ~ 1.5},
author = {Y. Sophia Dai and Jacqueline Bergeron and Martin Elvis and Alain Omont and Jia-Sheng Huang and Jamie Bock and Asantha Cooray and Giovanni Fazio and Evanthia Hatziminaoglou and Edo Ibar and Georgios E. Magdis and Seb J. Oliver and Mathew J. Page and Ismael Perez-Fournon and Dimitra Rigopoulou and Isaac G. Roseboom and Douglas Scott and Myrto Symeonidis and Markos Trichas and Joaquin D. Vieira and Christopher N. A. Willmer and Michael Zemcov},
journal= {arXiv preprint arXiv:1205.1808},
year = {2015}
}
Comments
11 pages, 6 figures, 1 table. Accepted for publication in ApJ