Radio Sources Toward Galaxy Clusters at 30 GHz

Details Radio Sources Toward Galaxy Clusters at 30 GHz Radio Sources Toward Galaxy Clusters at 30 GHz

2006-08-13

arxiv.org/abs/astro-ph/0608274v2

Astron.J.134:897-905,2007

Astronomy and Astrophysics

Astrophysics

32 pages, 6 figures, accepted to AJ

Scientific paper

10.1086/519973

Extra-galactic 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 mJy source fluxes from 89 fields centered on known massive galaxy clusters and 8 non-cluster fields. We find that source counts in the inner regions of the cluster fields (within 0.5 arcmin of the cluster center) are a factor of 8.9 (+4.3,-2.8) times higher than counts in the outer regions of the cluster fields (radius greater than 0.5 arcmin). Counts in the outer regions of the cluster fields are in turn a factor of 3.3 (+4.1,-1.8) greater than those in the non-cluster fields. Counts in the non-cluster fields are consistent with extrapolations from the results of other surveys. We compute spectral indices of mJy sources in cluster fields between 1.4 and 28.5 GHz and find a mean spectral index of alpha = 0.66 with an rms dispersion of 0.36, where flux is proportional to frequency raised to negative alpha. 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.

Affiliated with

Also associated with

No associations

Rating

Radio Sources Toward Galaxy Clusters at 30 GHz does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Radio Sources Toward Galaxy Clusters at 30 GHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Sources Toward Galaxy Clusters at 30 GHz will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-251913