Weighing the Local Interstellar Medium Using Gamma Rays and Dust

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Cold gas forms a significant mass fraction of the Milky Way disk, but is its most uncertain baryonic component. The density and distribution of cold gas is of critical importance for Milky Way dynamics, as well as models of stellar and galactic evolution. Previous studies have used correlations between gas and dust to obtain high-resolution measurements of cold gas, but with large normalization uncertainties. We present a novel approach that uses Fermi-LAT γ-ray data to measure the total gas density, achieving a similar precision as previous works, but with independent systematic uncertainties. Notably, our results have sufficient precision to probe the range of results obtained by current world-leading experiments.
OriginalsprogEngelsk
Artikelnummer161002
TidsskriftPhysical Review Letters
Vol/bind13
Udgave nummer16
Antal sider7
ISSN0031-9007
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
We thank Adam Leroy, John Beacom, and Martin Rey for useful discussions. A. W. is supported by the Carlsberg Foundation via a Semper Ardens grant (CF15-0384). M. K. and T. L. are supported by the Swedish Research Council under Contract No. 2019-05135 and the European Research Council under Grant No. 742104. T. L. is also supported by the Swedish National Space Agency under Contract No. 117/19. This project used computing resources from the Swedish National Infrastructure for Computing (SNIC) under Projects No. 2021/3-42, No. 2021/6-326, and No. 2021-1-24 partially funded by the Swedish Research Council through Grant No. 2018-05973. This work made use of a HPC facility funded by a grant from VILLUM FONDEN (Project No. 16599). This work has made use of the following Python packages: numpy ; scipy ; tensorflow ; pymultinest ; iminuit ; mpi 4 py .

Publisher Copyright:
© 2023 American Physical Society.

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