Imperial College London
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ProfessorRobertoTrotta

Faculty of Natural Sciences, Department of Physics

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 7793r.trotta Website CV

 
 
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Assistant

 

Mrs Sheila Ekudo +44 (0)20 7594 2086

 
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Location

 

1009Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Johannesson:2016:1/16,
author = {Johannesson, G and de, Austri RR and Vincent, AC and Moskalenko, IV and Orlando, E and Porter, TA and Strong, AW and Trotta, R and Feroz, F and Graff, P and Hobson, MP},
doi = {1/16},
journal = {Astrophysical Journal},
title = {Bayesian analysis of cosmic ray propagation: evidence against homogeneous diffusion},
url = {http://dx.doi.org/10.3847/0004-637X/824/1/16},
volume = {824},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The American Astronomical Society, find out moreThe American Astronomical Society, find out moreThe Institute of Physics, find out moreThe Institute of Physics, find out moreBAYESIAN ANALYSIS OF COSMIC RAY PROPAGATION: EVIDENCE AGAINST HOMOGENEOUS DIFFUSIONG. Jóhannesson1, R. Ruiz de Austri2, A. C. Vincent3, I. V. Moskalenko4,5, E. Orlando4,5, T. A. Porter4,5, A. W. Strong6, R. Trotta7,8, F. Feroz9, P. Graff10,11Show full author listPublished 2016 June 3 • © 2016. The American Astronomical Society. All rights reserved.The Astrophysical Journal, Volume 824, Number 1 Citation G. Jóhannesson et al 2016 ApJ 824 16Download Article PDFFiguresTablesReferencesDownload PDF1482 Total downloads7070 total citations on Dimensions.Turn on MathJaxGet permission to re-use this articleShare this article    Share this content via email    Share on Facebook    Share on Twitter    Share on Google+    Share on MendeleyArticle informationAbstractWe 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, $\bar{p}$, and He) from the usual light elements (Be, B, C, N, and O). We find that the propagation parameters that best-fit $p,\bar{p}$, and He data are significantly different from those that fit light elements, including the B/C and 10Be/9Be 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
AU  - Johannesson,G
AU  - de,Austri RR
AU  - Vincent,AC
AU  - Moskalenko,IV
AU  - Orlando,E
AU  - Porter,TA
AU  - Strong,AW
AU  - Trotta,R
AU  - Feroz,F
AU  - Graff,P
AU  - Hobson,MP
DO  - 1/16
PY  - 2016///
SN  - 1538-4357
TI  - Bayesian analysis of cosmic ray propagation: evidence against homogeneous diffusion
T2  - Astrophysical Journal
UR  - http://dx.doi.org/10.3847/0004-637X/824/1/16
UR  - http://hdl.handle.net/10044/1/38503
VL  - 824
ER  -
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