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The Three-dimensional Spatial Distribution of Interstellar Gas in the Milky Way: Implications for Cosmic Rays and High-energy Gamma-ray Emissions
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland..
Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA.;Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA..
Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA.;Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA..
2018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 856, no 1, article id 45Article in journal (Refereed) Published
Abstract [en]

Direct measurements of cosmic ray (CR) species combined with observations of their associated gamma-ray emissions can be used to constrain models of CR propagation, trace the structure of the Galaxy, and search for signatures of new physics. The spatial density distribution of interstellar gas is a vital element for all these studies. So far, models have employed the 2D cylindrically symmetric geometry, but their accuracy is well behind that of the available data. In this paper, 3D spatial density models for neutral and molecular hydrogen are constructed based on empirical model fitting to gas line-survey data. The developed density models incorporate spiral arms and account for the warping of the disk, and the increasing gas scale height with radial distance from the Galactic center. They are employed together with the GALPROP CR propagation code to investigate how the new 3D gas models affect calculations of CR propagation and high-energy gamma-ray intensity maps. The calculations reveal non-trivial features that are directly related to the new gas models. The best-fit values for propagation model parameters employing 3D gas models are presented and they differ significantly from those derived with the 2D gas density models that have been widely used. The combination of 3D CR and gas density models provide a more realistic basis for the interpretation of non-thermal emissions from the Galaxy.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 856, no 1, article id 45
Keywords [en]
astroparticle physics, cosmic rays, diffusion, Galaxy: structure, gamma rays: ISM, ISM: structure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-225715DOI: 10.3847/1538-4357/aab26eISI: 000428306500002Scopus ID: 2-s2.0-85044777196OAI: oai:DiVA.org:kth-225715DiVA, id: diva2:1196740
Note

QC 20180411

Available from: 2018-04-11 Created: 2018-04-11 Last updated: 2018-04-11Bibliographically approved

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