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Studying the magnetized ISM with all-sky polarimetric radio maps

Lonsdale, Colin J. and Orlando, Elena and Hallinan, Gregg and Taylor, Greg and Dickinson, Clive (2019) Studying the magnetized ISM with all-sky polarimetric radio maps. Astro2020 Science White Paper, . (Unpublished)

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Synchrotron radiation from the interstellar medium (ISM) of our galaxy dominates the sky brightness at low radio frequencies, and carries information about relativistic and thermal electron distributions across a range of astrophysical environments. The polarization of the radiation, as modified by Faraday rotation effects in the ISM, also contains extensive information about the magnetic field. Comprehensive all-sky broadband mapping of this radiation, when combined with high frequency radio data, gamma ray data, cosmic ray (CR) measurements and sophisticated modeling, can revolutionize our understanding of the ISM and the processes that influence its evolution. Current widefield imagery of the galactic synchrotron emission is heterogeneous in frequency coverage, sky coverage, angular resolution and calibration accuracy, limiting utility for ISM studies. A new generation of all-digital low frequency array technologies is opening a path to matched resolution, high fidelity polarimetric imaging across a fully sampled swath of radio frequencies from a few tens to many hundreds of MHz, generating a transformational dataset for a broad range of scientific applications.

Item Type:Report or Paper (White Paper)
Related URLs:
URLURL TypeDescription Paper
Lonsdale, Colin J.0000-0003-4062-4654
Orlando, Elena0000-0001-6406-9910
Hallinan, Gregg0000-0002-7083-4049
Taylor, Greg0000-0001-6495-7731
Dickinson, Clive0000-0002-0045-442X
Group:Astronomy Department
Series Name:Astro2020 Science White Paper
Record Number:CaltechAUTHORS:20190401-162900858
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94339
Deposited By: George Porter
Deposited On:02 Apr 2019 14:42
Last Modified:30 Sep 2020 17:49

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