TY  - JOUR
AU  - Trotta, R.
AU  - Johannesson, G.
AU  - Moskalenko, I. V.
AU  - Porter, T. A.
AU  - Ruiz de Austri, R.
AU  - Strong, A. W.
PY  - 2011
DA  - 2011//
TI  - Constraints on Cosmic-Ray Propagation Models from a Global Bayesian Analysis
T2  - Astrophys. J.
JO  - Astrophysical Journal
SP  - 106
EP  - 16pp
VL  - 729
IS  - 2
PB  - Iop Publishing Ltd
KW  - astroparticle physics
KW  - cosmic rays
KW  - diffusion
KW  - Galaxy: general
KW  - ISM: general
KW  - methods: statistical
AB  - Research in many areas of modern physics such as, e. g., indirect searches for dark matter and particle acceleration in supernova remnant shocks rely heavily on studies of cosmic rays (CRs) and associated diffuse emissions (radio, microwave, X-rays, gamma-rays). While very detailed numerical models of CR propagation exist, a quantitative statistical analysis of such models has been so far hampered by the large computational effort that those models require. Although statistical analyses have been carried out before using semi-analytical models (where the computation is much faster), the evaluation of the results obtained from such models is difficult, as they necessarily suffer from many simplifying assumptions. The main objective of this paper is to present a working method for a full Bayesian parameter estimation for a numerical CR propagation model. For this study, we use the GALPROP code, the most advanced of its kind, which uses astrophysical information, and nuclear and particle data as inputs to self-consistently predict CRs, gamma-rays, synchrotron, and other observables. We demonstrate that a full Bayesian analysis is possible using nested sampling and Markov Chain Monte Carlo methods (implemented in the SuperBayeS code) despite the heavy computational demands of a numerical propagation code. The best-fit values of parameters found in this analysis are in agreement with previous, significantly simpler, studies also based on GALPROP.
SN  - 0004-637x
UR  - http://arxiv.org/abs/arXiv:1011.0037
UR  - https://doi.org/10.1088/0004-637X/729/2/106
DO  - 10.1088/0004-637X/729/2/106
LA  - English
N1  - ISI:000288608700029
ID  - Trotta_etal2011
ER  -