BAYESIAN ANALYSIS OF COSMIC RAY PROPAGATION: EVIDENCE AGAINST HOMOGENEOUS DIFFUSION

被引:0
作者
Johannesson, G. [1 ]
de Austri, R. Ruiz [2 ]
Vincent, A. C. [3 ]
Moskalenko, I. V. [4 ,5 ]
Orlando, E. [4 ,5 ]
Porter, T. A. [4 ,5 ]
Strong, A. W. [6 ]
Trotta, R. [7 ,8 ]
Feroz, F. [9 ]
Graff, P. [10 ,11 ]
Hobson, M. P. [9 ]
机构
[1] Univ Iceland, Inst Sci, Dunhaga 3, IS-107 Reykjavik, Iceland
[2] UV, CSIC, IFIC, Inst Fis Corpuscular, Valencia, Spain
[3] Univ Durham, Dept Phys, IPPP, Durham DH1 3LE, England
[4] Stanford Univ, Hansen Expt Phys Lab, Stanford, CA 94305 USA
[5] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA
[6] Max Planck Inst Extraterr Phys, Postfach 1312, D-85741 Garching, Germany
[7] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, Imperial Ctr Inference & Cosmol, Prince Consort Rd, London SW7 2AZ, England
[8] Univ London Imperial Coll Sci Technol & Med, Data Sci Inst, William Penney Lab, London SW7 2AZ, England
[9] Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England
[10] Johns Hopkins Univ, Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA
[11] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
关键词
astroparticle physics; cosmic rays; diffusion; Galaxy: general; ISM: general; methods: statistical; FERMI-LAT OBSERVATIONS; ENERGY-SPECTRA; ELEMENTAL COMPOSITION; SUPERNOVA-REMNANTS; SOLAR MODULATION; NUCLEI; SECONDARY; EMISSION; MODEL; CONSTRAINTS;
D O I
10.3847/0004-637X/824/1/16
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of the most complete scan of the parameter space for cosmic ray (CR) injection and propagation. We perform a Bayesian search of the main GALPROP parameters, using the MultiNest nested sampling algorithm, augmented by the BAMBI neural network machine-learning package. This is the first study to separate out low-mass isotopes (p, (p) over bar and He) from the usual light elements (Be, B, C, N, and O). We find that the propagation parameters that best-fit p, (p) over bar, and He data are significantly different from those that fit light elements, including the B/C and Be-10/Be-9 secondary-to-primary ratios normally used to calibrate propagation parameters. This suggests that each set of species is probing a very different interstellar medium, and that the standard approach of calibrating propagation parameters using B/C can lead to incorrect results. We present posterior distributions and best-fit parameters for propagation of both sets of nuclei, as well as for the injection abundances of elements from H to Si. The input GALDEF files with these new parameters will be included in an upcoming public GALPROP update.
引用
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页数:19
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