Presentation 1 : None
Dust emission in high redshift quasars
P. Cox, F. Bertoldi, C.L. Carilli, A. Beelen, A. Omont et al.
We report observations of three SDSS z>6 QSOs at 250 GHz (1.2 mm) using the 117-channel Max-Planck Millimeter Bolometer (Mambo-2) array at the
IRAM 30-meter telescope and at 43 GHz using the VLA. The observations at 43 GHz imply steeply rising spectra, indicative of thermal infrared emission from warm dust. The far-infrared luminosities are estimated to be
of ordre a $\approx 10^{13} \, L_\odot$, and the dust masses $\approx 10^8 \, l_\odot$. To account for the derived dust mases in the highest redshift
quasars known, vigorous dust formation must have taken place right after the first stars were formed. Whatever the mechanisms involved, these large amounts of dust should be taken into account when modeling the cosmic reionization.