RRATs number up to 400000 in the Galaxy with a birth rate of at most 1.4 per century, comparable in size to pulsars at high luminosities and consistent with supernova rates.
NE2025: An Updated Electron Density Model for the Galactic Interstellar Medium
4 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
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 (FRBs), 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 pulsars, active galactic nuclei, and masers, to update the NE2001 Galactic electron density model. We refit the thick and thin disks and three of the spiral arms. The new parameters for these large-scale components significantly repartition free electrons between the thick disk and spiral arms, thereby correcting NE2001's systematic underestimation of pulsar distance and scattering. Sightlines with excessive dispersion and scattering are used to identify new clumps that are added to the model, in addition to refining clumps that were already included (e.g., Cygnus, Vela, and Gum). The Galactic Center component is revised, yielding scattering time predictions that are $10^3$ times smaller than the Galactic Center in NE2001. The updated model, NE2025, provides a factor of $20\times$ improvement in median distance prediction accuracy and $100\%$ median improvement in scattering predictions based on DM, relative to NE2001. There is a $15\times$ improvement in median distance prediction accuracy relative to YMW16. NE2025 is available on Github and the Python Package Interface.
years
2026 4verdicts
UNVERDICTED 4representative citing papers
FRB dispersion measures reveal a large-scale excess of ionized gas in the northern sky spatially aligned with the Ursa Major supercluster.
A polarization catalog of 6,131 bursts from FRB 20240114A reveals linearly decreasing rotation measure, stable dispersion measure, high linear polarization fractions, low circular polarization, and a broad distribution of intrinsic polarization angles, indicating a dynamically evolving magneto-ionic
A phase-coherent 20-year timing solution for PSR J1905+0154A yields precise spin, orbital and astrometric parameters, identifies a helium white dwarf companion of 0.17-0.19 solar masses, and indicates the system may be unbound from NGC 6749.
citing papers explorer
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The RRATalog: a Galactic census of rotating radio transients
RRATs number up to 400000 in the Galaxy with a birth rate of at most 1.4 per century, comparable in size to pulsars at high luminosities and consistent with supernova rates.
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Great Walls of Cosmic Baryons in the Northern Sky
FRB dispersion measures reveal a large-scale excess of ionized gas in the northern sky spatially aligned with the Ursa Major supercluster.
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FAST Polarization Catalog of FRB 20240114A
A polarization catalog of 6,131 bursts from FRB 20240114A reveals linearly decreasing rotation measure, stable dispersion measure, high linear polarization fractions, low circular polarization, and a broad distribution of intrinsic polarization angles, indicating a dynamically evolving magneto-ionic
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The one and the only: the pulsar - white dwarf system in NGC 6749
A phase-coherent 20-year timing solution for PSR J1905+0154A yields precise spin, orbital and astrometric parameters, identifies a helium white dwarf companion of 0.17-0.19 solar masses, and indicates the system may be unbound from NGC 6749.