Journal
ASTROPHYSICAL JOURNAL
Volume 824, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/824/1/16
Keywords
astroparticle physics; cosmic rays; diffusion; Galaxy: general; ISM: general; methods: statistical
Categories
Funding
- Royal Society [IE120221]
- STFC grant [ST/N000838/1]
- NASA [NNX13AC47G, NNX16AF27G, NNX15AU79G, NNX10AE78G]
- Ramon y Cajal program of the Spanish MICINN
- Spanish MICINN's Consolider-Ingenio Programme [MULTIDARK CSD2209-00064]
- Invisibles European ITN project (FP7-PEOPLE-ITN) [PITN-GA-2011-289442-INVISIBLES]
- SOM Sabor y origen de la Materia [2014-57816]
- Fenomenologia y Cosmologia de la Fisica mas alla del Modelo Estandar e Implicaciones Experimentales en la era del LHC MEC projects [FPA2013-44773]
- Severo Ochoa del MINECO [SEV-2014-0398]
- FQRNT (Quebec)
- Invisibles
- STFC [ST/N000838/1, ST/K001051/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N000838/1, ST/K001051/1] Funding Source: researchfish
- NASA [NNX16AF27G, 905866, NNX15AU79G, 796975, 134566, NNX10AE78G] Funding Source: Federal RePORTER
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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.
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