South Pole Telescope (SPT)

Product Name
Beam Realizations


Beam Realizations

These files contain realizations of the SPT beam used in constructing the systematic error covariance matrix described in Section 4.2.1 of Crawford et al.(2013). In Crawford et al. (2013), the linear least-squares fit to the measured bispectrum is repeated 1000 times, each time modifying the bispectrum data or the signal model by a realization of four sources of systematic error: beams, bandpasses, absolute calibration, and the spectral behavior of the cosmic infrared background. The other three sources are simple to generate from the Gaussian priors in the Table 2 of the paper. The realizations of the beam error are more complicated, and we include the ones used in the paper here.

We include 1000 realizations of the l-space beam for each observing band. The beam realizations posted here are weighted averages of the realizations for each observing season (2008 or 2009). In Crawford et al. (2013), the bispectra from each observing field were modified individually using the beam from the appropriate season, but using these weighted beams produces nearly identical fit results.

The beam realization files are in FITS format, with the data in the primary FITS array. The array is 29951-by-1000 elements, where 29951 is the number of l values at which the beam is defined. The appropriate l array to use with these beam realizations is a 29951-element vector (starting at 0) with unit spacing.

The beam realizations for 95 GHz are here.

The beam realizations for 150 GHz are here.

The beam realizations for 220 GHz are here.

Additional Details:

  • The information on this page is taken from this SPT page.
  • Crawford et al. 2013, A measurement of the secondary-CMB and millimeter-wave-foreground bispectrum using
    800 square degrees of South Pole Telescope dat", astro-ph/1303.3535

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