Planck intermediate results - XLV. Radio spectra of northern extragalactic radio sources
Planck intermediate results - XLV. Radio spectra of northern extragalactic radio sources
Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous ground-based radio observations between 1.1 and 37 …