Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-24
Mon.Not.Roy.Astron.Soc. 336 (2002) 97-111
Astronomy and Astrophysics
Astrophysics
16 pages, 13 figures; changed to match version accepted by MNRAS. Version with high-resolution figures available from http:/
Scientific paper
10.1046/j.1365-8711.2002.05683.x
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.
Ashdown Mark A. J.
Hobson Michael P.
Lasenby Anthony N.
Stolyarov Vladislav
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