Data Challenges

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At the Chicago meeting it was agreed that it would be useful to provide common inputs for all science forecasting, to include extra-galactic foreground, galactic foreground and noise maps at a range of frequencies. It was further agreed that, in order to support the widest range of uses, these would be provided as all-sky HEALPix maps at Nside-8192.

Possible sky-model inputs are:

  • Extra-galactice: Alvarez/Battaglia/Bond, PSM
  • Galactic: pySM, PSM

Please add to these lists as appropriate.

Inputs will be hosted at NERSC, where everyone is welcome to sign-up for an account under the "Data Analysis for Post-Planck CMB Experiments" allocation (PI Borrill). The files will then be located in the shared CMB-S4 file space (/project/projectdirs/cmbs4). In order to manage this space, all files stored there should be owned by the cmbs4 project account but accessible to the cmbs4 group. To do this:

  • log in to the cmbs4 project account following the instructions [here]
  • sync the files to an appropriate subdirectory in the project space
  • ensure that the permissions are set appropriately (g+rX,o-rwx)

Remember to include a README and to post the details on this wiki page.

For any NERSC issues, including access to the filegroup and/or project account, please contact Julian Borrill.

Data Challenge 1

Intended as a simple test to develop our practice, compare spectral- and map-based forecasting, contrast different map-based codes and methods, and coordinate r and non-r science forecasting.

  • Instrument specification:
Frequency (GHz) 30 40 85 95 145 155 215 270
Bandwidth (GHz) tbd tbd tbd tbd tbd tbd tbd tbd
Beam FWHM (arcmin) tbd tbd tbd tbd tbd tbd tbd tbd
  • Scalar, tensor & non-Gaussian CMB: Borrill
    • Planck cosmology + interesting values of r, f_NL
  • Extragalactic foregrounds: Alvarez/Battaglia/Bond
  • Galactic foregrounds: pySM/Ben
    • Nside 512 maps with delta-function bandpasses delivered at 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 85, 90, 95, 100, 120, 140, 145, 150, 155, 165, 195, 215, 220, 235, 245, 270, 280, 340, 350, 400, 545, 860 GHz (CMB-S4 + S3, WMAP, Planck & LiteBIRD frequencies)
  • Noise: homogeneous isotropic matched to N_ell
  • Masks: TBD