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[0802.1525] A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
Authors:Angelica de Oliveira-Costa (MIT), Max Tegmark (MIT), B. M. Gaensler (Sydney), Justin Jonas (Rhodes), T. L. Landecker (DRAO), Patricia Reich (MPIfR)
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Andy Strong

Joined: 17 Jun 2007
Posts: 5
Affiliation: Max-Planck-Institut für extraterrestrische Physik

PostPosted: November 13 2008  Reply with quote

I have a question about 0802.1525

My concern is isotropic backgrounds: they state that they subtracted the CMB,
but what about

(i) the background from radio galaxies etc, which has a steeper spectral
index than the Galactic synchrotron

(ii) instrumental offsets of the surveys.

Both of these are well documented in the literature but are not mentioned in this paper as far as I can make out.

Their PCA Component 1 contains as they say 'total stuff' but this is then a combination of Galactic and extragalactic emission ?
Would it not be advantageous to add an isotropic component to their PCA analysis.?

Is it because a PCA analysis is concerned only with variations ?
But how can it then claim to predict the actual sky at each frequency ?

Mabye I just overlooked something in the paper.
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