CO detection in the quasar BR1202-0725 at z = 4.69

Abstract

The number of identified high-redshift far-infrared hyperluminous sources (LFIR ≥ 1013L⊙) is now approaching ~20 (see e.g. Rowan-Robinson 1996). In about half of them, at z > 3.5, evidence for strong far-infrared emission has been obtained from its redshifted detection in the mm continuum. Most of the latter are bright radio-quiet QSOs (Omont et al. 1996b). The most prominent one, BR1202-0725 at z = 4.7, was first detected at 1.25mm with the IRAM 30m telescope (McMahon et al. 1994) with a flux of ∼ 10-15 mJy. Its submm detection at JCMT (Isaak et al. 1994) supports dust emission because of a submm-mm spectral index ≥ 3.