Radio sources toward galaxy clusters at 30 GHz

K. Coble, M. Bonamente, J. E. Carlstrom, K. Dawson, N. Hasler, W. Holzapfel, M. Joy, S. LaRoque, Daniel P Marrone, E. D. Reese

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Extragalactic radio sources are a significant contaminant in cosmic microwave background and Sunyaev-Zel'dovich effect experiments. Deep interferometric observations with the BIMA and OVRO arrays are used to characterize the spatial, spectral, and flux distributions of radio sources toward massive galaxy clusters at 28.5 GHz. We compute counts of millijansky source fluxes from 89 fields centered on known massive galaxy clusters and 8 noncluster fields. We find that source counts in the inner regions of the cluster fields (within 0,5′ of the cluster center) are a factor of 8.9-2.8 +4.3 times higher than counts in the outer regions of the cluster fields (radius greater than 0.5′). Counts in the outer regions of the cluster fields are, in turn, a factor of 3.3-1.8 +4.1 greater than those in the noncluster fields. Counts in the noncluster fields are consistent with extrapolations from the results of other surveys. We compute the spectral indices of millijansky sources in the cluster fields between 1.4 and 28.5 GHz and find a mean spectral index of α = 0.66 with an rms dispersion of 0.36, where flux S ∝ V. The distribution is skewed, with a median spectral index of 0.72 and 25th and 75th percentiles of 0.51 and 0.92, respectively. This is steeper than the spectral indices of stronger field sources measured by other surveys.

Original languageEnglish (US)
Pages (from-to)897-905
Number of pages9
JournalAstronomical Journal
Volume134
Issue number3
DOIs
StatePublished - Sep 2007
Externally publishedYes

Fingerprint

radio
galaxies
extragalactic radio sources
index
pollutant
contaminants
extrapolation
spatial distribution
experiment
microwaves
radii
distribution
effect
microwave

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Galaxies: clusters: General
  • Radio continuum: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Coble, K., Bonamente, M., Carlstrom, J. E., Dawson, K., Hasler, N., Holzapfel, W., ... Reese, E. D. (2007). Radio sources toward galaxy clusters at 30 GHz. Astronomical Journal, 134(3), 897-905. https://doi.org/10.1086/519973

Radio sources toward galaxy clusters at 30 GHz. / Coble, K.; Bonamente, M.; Carlstrom, J. E.; Dawson, K.; Hasler, N.; Holzapfel, W.; Joy, M.; LaRoque, S.; Marrone, Daniel P; Reese, E. D.

In: Astronomical Journal, Vol. 134, No. 3, 09.2007, p. 897-905.

Research output: Contribution to journalArticle

Coble, K, Bonamente, M, Carlstrom, JE, Dawson, K, Hasler, N, Holzapfel, W, Joy, M, LaRoque, S, Marrone, DP & Reese, ED 2007, 'Radio sources toward galaxy clusters at 30 GHz', Astronomical Journal, vol. 134, no. 3, pp. 897-905. https://doi.org/10.1086/519973
Coble K, Bonamente M, Carlstrom JE, Dawson K, Hasler N, Holzapfel W et al. Radio sources toward galaxy clusters at 30 GHz. Astronomical Journal. 2007 Sep;134(3):897-905. https://doi.org/10.1086/519973
Coble, K. ; Bonamente, M. ; Carlstrom, J. E. ; Dawson, K. ; Hasler, N. ; Holzapfel, W. ; Joy, M. ; LaRoque, S. ; Marrone, Daniel P ; Reese, E. D. / Radio sources toward galaxy clusters at 30 GHz. In: Astronomical Journal. 2007 ; Vol. 134, No. 3. pp. 897-905.
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