AzTEC 1.1-mm images of 16 radio galaxies at 0.5 < z < 5.2 and a quasar at z= 6.3

Abstract

We present 1.1-mm observations for a sample of 16 powerful radio galaxies at 0.5 <200 to ∼1300 M⊙yr-1. In addition, we find that for the radio galaxies the 1.1-mm flux density is anticorrelated with the largest angular size of the radio source. We also present newSpitzerimaging observations of several active galaxies in our sample. Combining these with archival data, we examine the mid-infrared colours of our sample. We find that radio galaxies for which we have detected a probable 1.1-mm counterpart have mid-infrared colours consistent with dusty starbursts, and are usually bluer than high-zSpitzer-selected active galaxies. In addition, we find arcs of 24-m sources extending across ∼200-500kpc, apparently associated with three of the radio galaxies. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.