ACT Data Products - CMB 2008 Power Spectra

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The ACT temperature power spectra are computed at 148 GHz and 218 GHz. Three spectra are given, for 148x148, 148x218, and 218x218.

The spectra are computed from four contiguous patches that together cover an area of 296 sq degrees in the Southern sky. They are estimated from 2008 ACT data, which is split into subsets to make four maps. Only cross-spectra of these maps are used in the final estimate. Errors are estimated using an analytic prescription.

The spectra are binned, and are each given in a separate file with the following columns:

-the mean multipole moment l
-the power spectrum in units of μK2, l(l+1)C_l/2pi
-the error for the binned value in units of μK2, l(l+1)C_l/2pi

These spectra are for use for plotting purposes. For statistical comparison to a theory Cl, the theory Cls should be convolved with bandpower window functions. The raw data Cls and window functions can be found in the ACT likelihood tarball.

Version v2a1 (September 2010) - first ACT 2008 release

Additional Details

  • "The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectrum at 148 and 218 GHz from the 2008 Southern Survey," S. Das et al. (2010) [print arXiv:1009.0847]

Back To ACT (MBAC): Derived CMB Products from 2008 Data

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