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:
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
| filename | md5sum |
|---|---|
| sroll20_sim_psb_nside32.tar | 947421c0f71b3a7d032e6ad5caa8f80c |
| sroll20_sim_ds1_nside32.tar | 04281159dd56daad8f2def927fb2cf5c |
| sroll20_sim_ds2_nside32.tar | 4044ee34228683778a6735cf95c94906 |
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