350 μm Dust Emission from High-Redshift Quasars
Abstract
We report detections of six high-redshift (1.8<=z<=6.4), optically luminous, radio-quiet quasars at 350 μm, using the SHARC II bolometer camera at the Caltech Submillimeter Observatory. Our observations double the number of high-redshift quasars for which 350 μm photometry is available. By combining the 350 μm measurements with observations at other submillimeter/millimeter wavelengths, for each source we have determined the temperature of the emitting dust (ranging from 40 to 60 K) and the far-infrared luminosity [(0.6-2.2)×1013 Lsolar]. The combined mean spectral energy distribution of all high-redshift quasars with two or more rest-frame far-infrared photometric measurements is best fit with a graybody with temperature of 47+/-3 K and a dust emissivity power-law spectral index of β=1.6+/-0.1. This warm dust component is a good tracer of the starburst activity of the quasar host galaxy. The ratio of the far-infrared to radio luminosities of infrared-luminous, radio-quiet high-redshift quasars is consistent with that found for local star-forming galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 2006
- DOI:
- arXiv:
- arXiv:astro-ph/0603121
- Bibcode:
- 2006ApJ...642..694B
- Keywords:
-
- Galaxies: Evolution;
- Galaxies: Starburst;
- Infrared: Galaxies;
- Infrared: ISM;
- Galaxies: Quasars: Individual: Alphanumeric: APM 08279+5255;
- quasars: individual (HS 1002+4400);
- quasars: individual (KUV 08086+4037);
- quasars: individual (J1409+5628);
- quasars: individual (PSS 2322+1944);
- quasars: individual (SDSS J1148+5251);
- Astrophysics
- E-Print:
- 12 pages, 6 figures, accepted for publication in ApJ