One Centimetre Receiver Array-prototype observations of the CRATES sources at 30 GHz

M. P. Gawroński, R. A. Battye, M. Birkinshaw, I. W A Browne, R. J. Davis, R. Feiler, A. J. Kus, K. Lancaster, S. R. Lowe, B. M. Pazderska, E. Pazderski, B. F. Roukema, P. N. Wilkinson

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)


Knowledge of the population of radio sources in the range ∼2-200 GHz is important for understanding their effects on measurements of the cosmic microwave background power spectrum. We report measurements of the 30-GHz flux densities of 605 radio sources from the Combined Radio All-sky Targeted Eight-GHz Survey (CRATES), which have been made with the One Centimetre Receiver Array-prototype (OCRA-p) on the Toruń 32-m telescope. The flux densities of sources that were also observed by Wilkinson Microwave Anisotropy Probe (WMAP) and previous OCRA surveys are in broad agreement with those reported here, however a number of sources display intrinsic variability. We find a good correlation between the 30 GHz and Fermi gamma-ray flux densities for common sources. We examine the radio spectra of all observed sources and report a number of gigahertz-peaked and inverted spectrum sources. These measurements will be useful for comparison to those from the Low Frequency Instrument of the Planck satellite, which will make some of its most sensitive observations in the region covered here.

Original languageEnglish
Pages (from-to)2690-2697
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 1 Feb 2011


  • Astronomical data bases: miscellaneous
  • Cosmology: observations
  • Galaxies: active
  • Galaxies: statistics


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