The SRoll 2.0 data set is made of 28 FITS files each containing the I, Q and U Stokes parameters of a single frequency, multi-bolometer, full-sky observation in KCMB, as well as its hit count and covariance matrix elements (II, IQ, IU, QQ, QU, UU, in KCMB2). These maps are generated using only the 8 polarised HFI bolometers ("PSB") of each polarised HFI frequency (100 GHz, 143 GHz, 217 GHz and 353 GHz) to obtain the best possible polarised maps. The maps are stored in HEALPix format at Nside=2,048 (50,331,648 pixels per map). They are named and formatted in the same way as the Planck HFI 2018 products (see the Planck Legacy Archive (PLA)):
Click on a filename to download it
| filename | unset pixels (1) | total hit count (2) | monopole [KCMB] (3) |
|---|---|---|---|
| SRoll20_SkyMap_100psb_full.fits | 1 | 73,610,049,461 | 1.084146e-04 |
| SRoll20_SkyMap_100psb_halfmission-1.fits | 2,528 | 35,159,616,608 | 1.084146e-04 |
| SRoll20_SkyMap_100psb_halfmission-2.fits | 50,976 | 38,445,797,009 | 1.084147e-04 |
| SRoll20_SkyMap_100psb_full-oddring.fits | 245,997 | 36,813,155,142 | 1.084146e-04 |
| SRoll20_SkyMap_100psb_full-evenring.fits | 250,726 | 36,763,865,185 | 1.084151e-04 |
| SRoll20_SkyMap_100ds1_full.fits | 506 | 37,361,828,313 | 1.084146e-04 |
| SRoll20_SkyMap_100ds2_full.fits | 14 | 36,248,157,754 | 1.084146e-04 |
| SRoll20_SkyMap_143psb_full.fits | 0 | 68,843,796,891 | 1.572528e-04 |
| SRoll20_SkyMap_143psb_halfmission-1.fits | 7,163 | 32,872,886,255 | 1.572528e-04 |
| SRoll20_SkyMap_143psb_halfmission-2.fits | 67,297 | 35,966,598,664 | 1.572539e-04 |
| SRoll20_SkyMap_143psb_full-oddring.fits | 6,360 | 34,365,731,398 | 1.572529e-04 |
| SRoll20_SkyMap_143psb_full-evenring.fits | 4,866 | 34,476,945,981 | 1.572529e-04 |
| SRoll20_SkyMap_143ds1_full.fits | 8,963 | 34,020,139,934 | 1.572528e-04 |
| SRoll20_SkyMap_143ds2_full.fits | 1 | 34,822,520,382 | 1.572528e-04 |
| SRoll20_SkyMap_217psb_full.fits | 1 | 66,504,719,750 | 5.400523e-04 |
| SRoll20_SkyMap_217psb_halfmission-1.fits | 13,618 | 31,516,161,239 | 5.400523e-04 |
| SRoll20_SkyMap_217psb_halfmission-2.fits | 116,377 | 34,980,457,031 | 5.400522e-04 |
| SRoll20_SkyMap_217psb_full-oddring.fits | 23,361 | 33,123,866,721 | 5.400523e-04 |
| SRoll20_SkyMap_217psb_full-evenring.fits | 20,931 | 33,377,208,031 | 5.400525e-04 |
| SRoll20_SkyMap_217ds1_full.fits | 9,716 | 33,394,633,451 | 5.400523e-04 |
| SRoll20_SkyMap_217ds2_full.fits | 21,624 | 33,107,556,356 | 5.400525e-04 |
| SRoll20_SkyMap_353psb_full.fits | 0 | 67,059,476,595 | 3.783446e-03 |
| SRoll20_SkyMap_353psb_halfmission-1.fits | 1,403 | 31,840,611,619 | 3.783446e-03 |
| SRoll20_SkyMap_353psb_halfmission-2.fits | 39,832 | 35,216,695,886 | 3.783447e-03 |
| SRoll20_SkyMap_353psb_full-oddring.fits | 3,102 | 33,480,025,683 | 3.783446e-03 |
| SRoll20_SkyMap_353psb_full-evenring.fits | 2,483 | 33,578,820,901 | 3.783446e-03 |
| SRoll20_SkyMap_353ds1_full.fits | 5,029 | 33,521,826,342 | 3.783446e-03 |
| SRoll20_SkyMap_353ds2_full.fits | 1 | 33,536,882,370 | 3.783446e-03 |
1. unset pixels are pixels either not seen by any bolometer of the detector set, or with an ill-conditioned covariance matrix due to the insufficient detector polarisation orientation distribution related to the Planck pointing. Unset pixels in SRoll 2.0 maps are set to HEALPix UNSEEN value (-1.6375e+30) in I_STOKES, Q_STOKES and U_STOKES maps, and to 0.0 in the covariance matrix elements (II, IQ, IU, QQ, QU, UU). Pixels with ill-conditioned covariance matrix still have a valid hit count in the HIT map.
2. total hit count is the the sum of HIT map valid pixel values. In Python, this is:
numpy.sum(HIT[II!=0])3. monopoles of the intensity maps are set to the same values as in Planck Legacy HFI2018 maps with the same frequency. The values given in the table are the results of the fit_monopole() function of the HEALPix library.
The dipole removed from the SRoll 2.0 intensity maps is the same one as for Planck Legacy Release:
The SRoll 2.0 data files use the same FITS file format as the Planck Legacy Archive (PLA). More details can be found in the FITS file format description page.