2013/07/31 by R. Ricci, S. Righini, R. Verma +14 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Galaxy #Gamma-ray bursts and supernovae #Physics #QSOS #Radio Astronomy Observations and Technology #Radio galaxy #Radio spectrum #Radio telescope #Redshift #Source counts #Spectral line #Telescope #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stt1412
14 pages, 6 figures, 7 tables. Accepted for publication on MNRAS
arxiv created 2013/07/31 · openalex publication_date 2013/09/20 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present follow-up observations at 5, 8 and 30 GHz of the K-band Northern Wide Survey (KNoWS) 20 GHz Bright Sample, performed with the 32-m Medicina radio telescope and the 32-m Toruń radio telescope. The KNoWS sources were selected in the Northern Polar Cap (δ > 72°) and have a flux density limit S20 GHz = 115 mJy. We include NRAO-VLA Sky Survey 1.4 GHz measurements to derive the source radio spectra between 1.4 and 30 GHz. Based on optical identifications, 68 per cent of the sources are quasars and 27 per cent are radio galaxies. A redshift measurement is available for 58 per cent of the sources. The radio spectral properties of the different source populations are found to be in agreement with those of other high-frequency-selected samples.