Alexandre Beelen et al. 2006 ApJ 642 694 doi:10.1086/500636
350 μm Dust Emission from High-Redshift Quasars
FREEAlexandre Beelen1,6, Pierre Cox2, Dominic J. Benford3, C. Darren Dowell4, Attila Kovács5, Frank Bertoldi6, Alain Omont7 and Chris L. Carilli8
Show affiliationsWe 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 [
× 1013 L
]. 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.
- Subject headings
galaxies: evolution; galaxies: starburst; infrared: galaxies; infrared: ISM; quasars: individual (APM 08279+5255, HS 1002+4400, KUV 08086+4037, J1409+5628, PSS 2322+1944, SDSS J1148+5251)
- Dates
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Issue 2 (2006 May 10)
Received 2005 September 26, accepted for publication 2005 December 6
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350 μm Dust Emission from High-Redshift Quasars
Alexandre Beelen et al. 2006 ApJ 642 694
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