Montage and Cosmic Background Studies

Members of the radio and sub-millimeter community and the cosmic background communities have begun to use Montage. The image we used for the blog banner is in fact a mosaic of 21-cm data obtained at Arecibo. Here, I talk about how a cosmic background experiment, the Cosmic Background Imager (CBI), used Montage. The CBI operated in the Andes from 1999 to 2008, where it studied the cosmic micowave background in 10 bands 26 and 36 GHz. It was used primarily to investigate anistropies in the microwave background, a probe of the physics of the very early Universe. The CBI was the first experiment to detect intrinsic anisotropy in the microwave background on mass scales of galaxy clusters.

CMB as measured by the CBI experiment (Credit: CBI)

The CBI Telescope in Chile

The CBI Telescope in Chile

To support the calculations of the final angular power spectrum of total intensity
anisotropies in the microwave background, the CBI project (Sievers et al. 2009) included results from a 30 GHz foreground survey conducted with the Green Bank Telescope (GBT) to place significant constraints on the possible contamination due to foreground point sources. The project used Montage to create maps of background sources that acted as templates in assessing foreground source contamination.

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