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An Improved Model of Diffuse Galactic Radio Emission from 10 MHz to 5 THz
Name
1605.04920.pdf
Description
Accepted version
Size
2.89 MB
Format
Adobe PDF
Checksum (MD5)
380399692bad5f7ef240042a6ea53fc9
Author(s)
Zheng, H
Tegmark, M
Dillon, JS
Kim, DA
Liu, A
Neben, AR
Jonas, J
Reich, P
Reich, W
Date Issued
2017
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Citation
Zheng, H., et al. "An Improved Model of Diffuse Galactic Radio Emission from 10 Mhz to 5 Thz." Monthly Notices of the Royal Astronomical Society 464 3 (2017): 3486-97.
Version
Author's final manuscript
Abstract
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society We present an improved Global Sky Model (GSM) of diffuse Galactic radio emission from 10 MHz to 5 THz, whose uses include foreground modelling for cosmic microwave background (CMB) and 21 cm cosmology. Our model improves on past work both algorithmically and by adding new data sets such as the Planck maps and the enhanced Haslam map. Our method generalizes the principal component analysis approach to handle non-overlapping regions, enabling the inclusion of 29 sky maps with no region of the sky common to all. We also perform a blind separation of our GSM into physical components with a method that makes no assumptions about physical emission mechanisms (synchrotron, free-free, dust, etc). Remarkably, this blind method automatically finds five components that have previously only been found 'by hand', which we identify with synchrotron, free-free, cold dust, warm dust, and the CMB anisotropy. Computing the cross-power spectrum between these blindly extracted components and Planck component maps, we find a strong correlation at all angular scales. The improved GSM is available online at http://github.com/jeffzhen/gsm2016.
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
10.1093/MNRAS/STW2525
