Journal Article

A model of diffuse Galactic radio emission from 10 MHz to 100 GHz

Angélica De Oliveira-Costa, Max Tegmark, B. M. Gaensler, Justin Jonas, T. L. Landecker and Patricia Reich

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 1, pages 247-260
Published in print July 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI:
A model of diffuse Galactic radio emission from 10 MHz to 100 GHz

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Understanding diffuse Galactic radio emission is interesting both in its own right and for minimizing foreground contamination of cosmological measurements. cosmic microwave background experiments have focused on frequencies ≳10 GHz, whereas 21-cm tomography of the high-redshift universe will mainly focus on ≲0.2 GHz, for which less is currently known about Galactic emission. Motivated by this, we present a global sky model derived from all publicly available total power large-area radio surveys, digitized with optical character recognition when necessary and compiled into a uniform format, as well as the new Villa Elisa data extending the 1.42-GHz map to the entire sky. We quantify statistical and systematic uncertainties in these surveys by comparing them with various global multifrequency model fits. We find that a principal component based model with only three components can fit the 11 most accurate data sets (at 10, 22, 45 and 408 MHz and 1.42, 2.326, 23, 33, 41, 61, 94 GHz) to an accuracy around 1–10 per cent depending on frequency and sky region. Both our data compilation and our software returning a predicted all-sky map at any frequency from 10 MHz to 100 GHz are publicly available at

Keywords: methods: data analysis; astronomical data bases: miscellaneous; ISM: structure; diffuse radiation; radio continuum: ISM

Journal Article.  9177 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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