A POPULATION OF DUST-RICH QUASARS AT z {approx} 1.5

Journal Article · Sun Jul 01 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/753/1/33· OSTI ID:22036942

Dai, Y Sophia; Elvis, Martin; Jiasheng, Huang; Fazio, Giovanni; Trichas, Markos ^[1]; Bergeron, Jacqueline; Omont, Alain ^[2]; Bock, Jamie; Vieira, Joaquin D ^[3]; Cooray, Asantha ^[4]; Hatziminaoglou, Evanthia ^[5]; Ibar, Edo ^[6]; Magdis, Georgios E; Rigopoulou, Dimitra ^[7]; Oliver, Seb J ^[8]; Page, Mathew J; Symeonidis, Myrto ^[9]; Perez-Fournon, Ismael ^[10]; Roseboom, Isaac G ^[11]; Scott, Douglas ^[12] ; others, and

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
2. Institut d'Astrophysique de Paris, UMR7095, 98bis boulevard Arago, F-75014 Paris (France)
3. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
4. Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575 (United States)
5. ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei Muenchen (Germany)
6. UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
7. Department of Astrophysics, Oxford University, Keble Road, Oxford OX1 3RH (United Kingdom)
8. Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH (United Kingdom)
9. Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT (United Kingdom)
10. Instituto de Astrofisica de Canarias (IAC), E-38200 La Laguna, Tenerife (Spain)
11. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
12. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada)

We report Herschel SPIRE (250, 350, and 500 {mu}m) 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 {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{sup 11.3} to 10{sup 13.5} L{sub 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 {approx}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 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.

• OSTI ID: 22036942
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 753; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTRONOMY
ASTROPHYSICS
BOLOMETERS
COSMIC DUST
DETECTION
ENERGY SPECTRA
FAR INFRARED RADIATION
GALAXIES
GALAXY NUCLEI
INDEXES
LUMINOSITY
QUASARS
RED SHIFT
ULTRAVIOLET RADIATION
WAVELENGTHS