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Galactic neutral hydrogen and the magnetic ISM foreground

Published online by Cambridge University Press:  08 May 2018

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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