Overview
We provide new clean maps of the CMB temperature and polarisation anisotropies (as measured by Planck) constructed with a novel internal linear combination (ILC) algorithm using directional, scale-discretised wavelets – Scale-discretised, directional wavelet ILC or SILC.
SILC relies on the S2LET code to compute fast wavelet transforms of signals on the sphere, and the SSHT and SO3 codes to compute fast harmonic transforms on the sphere and rotation group, respectively. Output maps are provided in HEALPix format.
For further details, please see our related papers: Rogers et al. (2016), SILC: a new Planck Internal Linear Combination CMB temperature map using directional wavelets and Rogers et al. (2016), Spin-SILC: CMB polarisation component separation with spin wavelets.
Data products
We make SILC CMB temperature and polarisation data products publicly available, for final CMB maps that are both inpainted and non-inpainted.
SILC temperature data release R1 can be downloaded from Zenodo at DOI:10.5281/zenodo.44373.
SILC polarisation data release R1 can be downloaded from Zenodo at DOI:10.5281/zenodo.50579.
Papers and referencing
If you make use of the SILC data products, please reference this site (http://www.silc-cmb.org) and our related academic papers:
Keir K. Rogers, Hiranya V. Peiris, Boris Leistedt, Jason D. McEwen, Andrew Pontzen, SILC: a new Planck Internal Linear Combination CMB temperature map using directional wavelets, Mon. Not. Roy. Astron. Soc., submitted, 2016 (ArXiv).
Keir K. Rogers, Hiranya V. Peiris, Boris Leistedt, Jason D. McEwen, Andrew Pontzen, Spin-SILC: CMB polarisation component separation with spin wavelets, Mon. Not. Roy. Astron. Soc., submitted, 2016 (ArXiv).
You might also like to peruse our related papers describing the methods employed in creating SILC data products, including, for example:
J. D. McEwen, B. Leistedt, M. Büttner, H. V. Peiris, and Y. Wiaux. Directional spin wavelets on the sphere, IEEE Trans. Sig. Proc., submitted, 2015 (ArXiv).
J. D. McEwen, M. Büttner, B. Leistedt, H. V. Peiris, Y. Wiaux, A novel sampling theorem on the rotation group, IEEE Sig. Proc. Let., 22(12):2425-2429, 2015 (ArXiv | DOI).
B. Leistedt, J. D. McEwen, P. Vandergheynst and Y. Wiaux, S2LET: A code to perform fast wavelet analysis on the sphere, Astron. & Astrophys., 558(A128):1-9, 2013 (ArXiv | DOI).
J. D. McEwen, P. Vandergheynst, and Y. Wiaux. On the computation of directional scale-discretized wavelet transforms on the sphere, in Wavelets and Sparsity XV, SPIE International Symposium on Optics and Photonics, 8858, 2013 (ArXiv | DOI).
J. D. McEwen and Y. Wiaux, A novel sampling theorem on the sphere, IEEE Trans. Signal Proc., 59, 5876-5887, 2011 (ArXiv | DOI).
Y. Wiaux, J. D. McEwen, P. Vandergheynst, O. Blanc, Exact reconstruction with directional wavelets on the sphere, Mon. Not. Roy. Astron. Soc., 388(2):770-788, 2008 (ArXiv | DOI).
License
SILC data products are licensed under a Creative Commons Attribution 4.0 International License.
Authors
The SILC analysis pipeline and the SILC CMB data products have been developed and created by Keir Rogers, Hiranya Peiris, Boris Leistedt, Jason McEwen, and Andrew Pontzen at University College London (UCL).