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Galactic neutral hydrogen and the magnetic ISM foreground

Published online by Cambridge University Press:  08 May 2018

S.E. Clark Open the ORCID record for S.E. Clark [Opens in a new window]
S.E. Clark*
Affiliation:
Institute for Advanced Study, 1 Einstein Drive, Princeton, New Jersey, USA email: seclark@ias.edu Hubble Fellow
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Abstract

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The interstellar medium is suffused with magnetic fields, which inform the shape of structures in the diffuse gas. Recent high-dynamic range observations of Galactic neutral hydrogen, combined with novel data analysis techniques, have revealed a deep link between the morphology of neutral gas and the ambient magnetic field. At the same time, an observational revolution is underway in low-frequency radio polarimetry, driven in part by the need to characterize foregrounds to the cosmological 21-cm signal. A new generation of experiments, capable of high angular and Faraday depth resolution, are revealing complex filamentary structures in diffuse polarization. The relationship between filamentary structures observed in radio-polarimetric data and those observed in atomic hydrogen is not yet well understood. Multiwavelength observations will enable new insights into the magnetic interstellar medium across phases.

Keywords

magnetic fieldspolarizationISM: structureISM: magnetic fieldscosmology: observations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 146 - 150
Copyright
Copyright © International Astronomical Union 2018 

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