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arXiv:astro-ph/9807150 (astro-ph)
[Submitted on 15 Jul 1998 (v1), last revised 10 Aug 1998 (this version, v2)]

Title:Propagation of cosmic-ray nucleons in the Galaxy

Authors:A. W. Strong, I. V. Moskalenko (MPE, Garching)
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Abstract: We describe a method for the numerical computation of the propagation of primary and secondary nucleons, primary electrons, and secondary positrons and electrons. Fragmentation and energy losses are computed using realistic distributions for the interstellar gas and radiation fields, and diffusive reacceleration is also incorporated. The models are adjusted to agree with the observed cosmic-ray B/C and 10Be/9Be ratios. Models with diffusion and convection do not account well for the observed energy dependence of B/C, while models with reacceleration reproduce this easily. The height of the halo propagation region is determined, using recent 10Be/9Be measurements, as >4 kpc for diffusion/convection models and 4-12 kpc for reacceleration models. For convection models we set an upper limit on the velocity gradient of dV/dz < 7 km/s/kpc. The radial distribution of cosmic-ray sources required is broader than current estimates of the SNR distribution for all halo sizes. Full details of the numerical method used to solve the cosmic-ray propagation equation are given.
Comments: 15 pages including 23 ps-figures and 3 tables, latex2e, uses this http URL (ver. of 11 May 1998, enclosed), this http URL, this http URL. To be published in ApJ 1998, v.509 (December 10 issue). More details can be found at this http URL Some references are corrected
Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:astro-ph/9807150
  (or arXiv:astro-ph/9807150v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9807150
Journal reference: Astrophys.J.509:212-228,1998
Related DOI: https://doi.org/10.1086/306470

Submission history

From: Igor Moskalenko [view email]
[v1] Wed, 15 Jul 1998 11:10:18 UTC (370 KB)
[v2] Mon, 10 Aug 1998 14:54:26 UTC (370 KB)
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