NE2025: An Updated Electron Density Model for the Galactic Interstellar Medium
Stella Koch Ocker; J. M. Cordes · 2026 · The Astrophysical Journal
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Abstract
Abstract Free electrons in the Galactic interstellar medium (ISM) disperse and scatter coherent radio waves, by amounts that depend on the distance to the radio source. Models of the Galactic electron density are thus widely used to predict distances and scattering of compact radio sources (including pulsars, fast radio bursts, and long-period transients), in addition to mitigating ISM foregrounds in Galactic and extragalactic studies. We use a sample of 171 precise pulsar distances, based entirely on parallaxes and globular cluster associations, as well as scattering measurements of 568 pulsa
Abstract by Stella Koch Ocker; J. M. Cordes, The Astrophysical Journal (2026) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/1538-4357/ae5825