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Sroll 2.0 simulations

 

 

Simulations description

The SRoll 2.0 simulations are produced in the same way as Planck HFI 2018 Legacy simulations, described in the Planck Explanatory Supplement. The common features and differences with Planck HFI 2018 simulations are listed here:

 

 

 

File list

SRoll 2.0 simulations are packaged in three 1.4GB tar files, each file containing all the simulations for a given detector set, respectively all (8) PSB per frequency, detset1 (4 PSB) and detset2 (the other 4 PSB):

 

Click on a filename to download it

 

filenamemd5sum
sroll20_sim_psb_nside32.tar 947421c0f71b3a7d032e6ad5caa8f80c
sroll20_sim_ds1_nside32.tar 04281159dd56daad8f2def927fb2cf5c
sroll20_sim_ds2_nside32.tar 4044ee34228683778a6735cf95c94906

 

 

Data file format description

Each tar file contains 9000 FITS files, each FITS file having an empty primary HDU and an extension HDU with three columns for the three Stokes components: I, Q, U. Please note that since data and simulations share the same scanning strategy and sample flagging, the same detsets and data cuts have the same hit count and covariance matrix in data and simulations. So hit counts and covariance matrices are not given for simulations, please refer to the corresponding SRoll 2.0 data files if you need them.

 

========== file header ==========
Filename: sroll20_sim_nside32/sroll20_sim_000_100psb_full.fits
No.    Name      Ver    Type      Cards   Dimensions   Format
  0  PRIMARY       1 PrimaryHDU       4   ()
  1  xtension      1 BinTableHDU     22   12R x 3C   [1024E, 1024E, 1024E]

========== HDU[0] header ==========
         SIMPLE =            True / conforms to FITS standard
         BITPIX =               8 / array data type
          NAXIS =               0 / number of array dimensions
         EXTEND =            True /

========== HDU[1] header ==========
       XTENSION =        BINTABLE / binary table extension
         BITPIX =               8 / array data type
          NAXIS =               2 / number of array dimensions
         NAXIS1 =           12288 / length of dimension 1
         NAXIS2 =              12 / length of dimension 2
         PCOUNT =               0 / number of group parameters
         GCOUNT =               1 / number of groups
        TFIELDS =               3 / number of table fields
         TTYPE1 =     TEMPERATURE /
         TFORM1 =           1024E /
         TTYPE2 =  Q_POLARISATION /
         TFORM2 =           1024E /
         TTYPE3 =  U_POLARISATION /
         TFORM3 =           1024E /
        PIXTYPE =         HEALPIX / HEALPIX pixelisation
       ORDERING =          NESTED / Pixel ordering scheme, either RING or NESTED
        EXTNAME =        xtension / name of this binary table extension
          NSIDE =              32 / Resolution parameter of HEALPIX
       FIRSTPIX =               0 / First pixel # (0 based)
        LASTPIX =           12287 / Last pixel # (0 based)
       INDXSCHM =        IMPLICIT / Indexing: IMPLICIT or EXPLICIT
         OBJECT =         FULLSKY / Sky coverage, either FULLSKY or PARTIAL