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

Abstract

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 Torun 32-m telescope. The flux densities of sources that were also observed by 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.

21 pages (9 pages of text, 12 pages of table), 7 figures. Erratum appended to end (page 20). Accepted by MNRAS. The definitive version is available at www.blackwell-synergy.com

References in corpus (23)

• Fermi Large Area Telescope First Source Catalog
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
• The First Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• The Sixth VLBA Calibrator Survey: VCS6
• The Wilkinson Microwave Anisotropy Probe (WMAP) Source Catalog
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP)Observations: Beam Maps and Window Functions
• The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample
• The Evolution of NGC 7027 at Radio Frequencies: A New Determination of the Distance and Core Mass
• Correlation of Fermi-LAT sources with the AT20GHz radio survey
• High-frequency radio properties of sources in the Fermi-LAT 1-year Point Source Catalogue
• The extragalactic radio-source population at 95 GHz
• 30 GHz flux density measurements of the Caltech-Jodrell flat-spectrum sources with OCRA-p
• 9C continued: a radio-source survey at 15 GHz
• High-frequency radio polarization measurements of WMAP point sources
• Preliminary Sunyaev Zel'dovich Observations of Galaxy Clusters with OCRA-p
• On the suspected timing-offset-induced calibration error in the Wilkinson microwave anisotropy probe time-ordered data
• The Connection between Radio and Gamma-ray Emission in Active Galactic Nuclei
• Filling in the Gaps in the 4.85 GHz Sky
• 30 GHz observations of sources in the VSA fields
• Simulations and Observations of the Microwave Universe
• The 9C Survey: a deeper source count at 15 GHz

Cited by in corpus (5)

• Simultaneous Planck, Swift, and Fermi observations of X-ray and gamma-ray selected blazars
• High--frequency predictions for number counts and spectral properties of extragalactic radio sources. New evidences of a break at mm wavelengths in spectra of bright blazar sources
• The RoboPol optical polarization survey of gamma-ray - loud blazars
• Improving pointing of Toruń 32-m radio telescope: effects of rail surface irregularities
• The comptonization parameter from simulations of single-frequency, single-dish, dual-beam, cm-wave observations of galaxy clusters and mitigating CMB confusion using the Planck sky survey