Papers › Empirical estimates of the Galactic halo contribution to the dispersion measures of...
Empirical estimates of the Galactic halo contribution to the dispersion measures of extragalactic fast radio bursts using X-ray absorption
Sanskriti Das, Smita Mathur, Anjali Gupta, Fabrizio Nicastro, Yair Krongold
The archive published only this paper's code-link row. Authors, date and abstract are from arXiv's metadata (CC0), read from the Kaggle arXiv metadata snapshot of 2026-09-12 where its title matched the archive's; the title is the archive's.
We provide an empirical list of the Galactic dispersion measure (DM_(Gal)) contribution to the extragalactic fast radio bursts along 72 sightlines. It is independent of any model of the Galaxy, i.e., we do not assume the density of the disk or the halo, spatial extent of the halo, baryonic mass content, or any such external constraints to measure DM_(Gal). We use 21-cm, UV, EUV and X-ray data to account for different phases, and find that DM_(Gal) is dominated by the hot phase probed by X-ray absorption. We improve upon the measurements of N(\oviin) and f_(OVII) compared to previous studies, thus providing a better estimate of the hot phase contribution. The median DM_(Gal)=64⁺²⁰₋₂₃ cm⁻³ pc, with a 68% (90%) confidence interval of 33--172 (23--660) cm⁻³ pc. The DM_(Gal) does not appear to follow any trend with the galactic longitude or latitude, and there is a large scatter around the values predicted by simple disk+spherical halo models. Our measurements provide more complete and accurate estimates of DM_(Gal) independent from the previous studies. We provide a table and a code to retrieve DM_(Gal) for any FRB localized in the sky.
Code
Repository list and official/mentioned flags are the archive's, frozen 2025-07-28. Reachability, where shown, is from one Syntology probe window (2026-09-16 to 2026-09-18); repositories not probed show nothing. GitHub stars are not tracked.
Code Syntology ran Syntology
Not run by Syntology. Nothing on this page verifies that the listed code works.
Results from the paper archive 2025-07-28
No leaderboard rows for this paper in the archive.
Report a problem or propose a change · a person checks every report against the paper or source before anything changes; decisions are listed on /corrections