Global Sky Model: A Model of Diffuse Galactic Radio Emission

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Global Sky Model (GSM): A Model of Diffuse Galactic Radio Emission from 10 MHz to 100 GHz

Post by owlice » Sat Nov 06, 2010 1:59 pm

[c]Global Sky Model (GSM): A Model of Diffuse Galactic Radio Emission from 10 MHz to 100 GHz[/c][/b]
Abstract: 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 1.4 GHz map to the entire sky. We quantify statistical and systematic uncertainties in these surveys by comparing them with various global multi-frequency 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 & 408 MHz and 1.4, 2.3, 23, 33, 41, 61, 94 GHz) to an accuracy around 1%-10% depending on frequency and sky region. The data compilation and software returning a predicted all-sky map at any frequency from 10 MHz to 100 GHz are publicly available in the archive file at the link below.

Credit: de Oliveira-Costa, Angelica; Tegmark, Max; Gaensler, B. M.; Jonas, Justin; Landecker, T. L.; Reich, Patricia

Site: https://doi.org/10.20356/C4MH2Q
http://adsabs.harvard.edu/abs/2008MNRAS.388..247D

Bibcode: 2010ascl.soft11010D

Preferred citation method: http://adsabs.harvard.edu/abs/2008MNRAS.388..247D

ID: ascl:1011.010
Last edited by Ada Coda on Thu Nov 29, 2018 6:05 pm, edited 1 time in total.
Reason: Updated code entry.
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