All-sky component separation for the Planck mission
Abstract
An harmonic-space maximum-entropy method (MEM) is presented for separating the emission from different physical components in all-sky observations by the forthcoming Planck satellite. The analysis is performed at full Planck resolution, with a pixel size of 1.7 arcmin, which corresponds to a maximum multipole of around 6000. The simulated Planck data include emission from the CMB, the kinetic and thermal Sunyaev-Zel'dovich (SZ) effects from galaxy clusters, as well as Galactic dust, free-free and synchrotron emission. Our simulations also assume homogeneous, uncorrelated pixel noise, although this is not a requirement of the method. We find that the MEM technique produces faithful reconstructions of the main input components over the whole sky, without the need to perform a Galactic cut. The CMB power spectrum is accurately recovered up to a multipole of around 2000. The algorithm is parallelised so that the entire reconstruction can be performed in around 6 hr using 30 R10000 processors on an SGI Origin 2000 supercomputer and requires 14 Gb of memory.
Cite
@article{arxiv.astro-ph/0105432,
title = {All-sky component separation for the Planck mission},
author = {V. Stolyarov and M. P. Hobson and M. A. J. Ashdown and A. N. Lasenby},
journal= {arXiv preprint arXiv:astro-ph/0105432},
year = {2009}
}
Comments
16 pages, 13 figures; changed to match version accepted by MNRAS. Version with high-resolution figures available from http://www.mrao.cam.ac.uk/projects/cpac/pub.html