A possibility of interpretation of the cosmic ray kneenear 10 TV as a contribution of a single close source

Karmanov, D.; Kovalev, I.; Kudryashov, I.; Kurganov, A.; Latonov, V. V.; Panov, A.; Podorozhnyy, D.; Turundaevskiy, A.

doi:10.48550/arxiv.1907.05987

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…chance one or a few nearby sources whose contributions are different from the sum of the other background sources, spectral structures may also be produced [52][53][54][55][56][57][58]. In light of the new measurements of the CR spectra, in particular, by the DAMPE, we revisit the modeling of CR sources from TeV to 100 PeV in a phenomenological way.…”

Section: Introductionmentioning

confidence: 99%

Implications on the origin of cosmic rays in light of 10 TV spectral softenings

Yue

Yuan

et al. 2019

Front. Phys.

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Precise measurements of the energy spectra of cosmic rays (CRs) show various kinds of features deviating from single power-laws, which give very interesting and important implications on their origin and propagation. Previous measurements from a few balloon and space experiments indicate the existence of spectral softenings around 10 TV for protons (and probably also for Helium nuclei). Very recently, the DArk Matter Particle Explorer (DAMPE) measurement about the proton spectrum clearly reveals such a softening with a high significance. Here we study the implications of these new measurements, as well as the groundbased indirect measurements, on the origin of CRs. We find that a single component of CRs fails to fit the spectral softening and the air shower experiment data simultaneously. In the framework of multiple components, we discuss two possible scenarios, the multiple source population scenario and the background plus nearby source scenario. Both scenarios give reasonable fits to the wide-band data from TeV to 100 PeV energies. Considering the anisotropy observations, the nearby source model is favored.

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Section: Introductionmentioning

confidence: 99%

Implications on the origin of cosmic rays in light of 10 TV spectral softenings

Yue

Yuan

et al. 2019

Front. Phys.

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“…Several new features of the CR spectra have been revealed recently, including the hundred-GV hardenings [1-8] and ∼ 10 TV softenings [8][9][10]. These new results challenge our traditional understanding about the framework of CR production and propagation, imposing new processes or ingredients of the CR problems (e.g., [11][12][13][14][15][16][17][18][19][20]).…”

Section: Introductionmentioning

confidence: 99%

Nearby source interpretation of differences among light and medium composition spectra in cosmic rays

Yuan,

Qiao,

Guo

et al. 2020

Preprint

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Recently the AMS-02 reported the precise measurements of the energy spectra of medium-mass compositions (Neon, Magnesium, Silicon) of primary cosmic rays, which reveal different properties from those of light compositions (Helium, Carbon, Oxygen). Here we propose a nearby source scenario, together with the background source contribution, to explain the newly measured spectra of cosmic ray Ne, Mg, Si, and particularly their differences from that of He, C, O. Their differences at high energies can be naturally accounted for by the element abundance of the nearby source. Specifically, the abundance ratio of the nearby source to the background of the Ne, Mg, Si elements is lower by a factor of ∼ 1.7 than that of the He, C, O elements. Such a difference could be due to the abundance difference of the stellar evolution of the progenitor star or the acceleration process/environment, of the nearby source. This scenario can simultaneously explain the high-energy spectral softening features of cosmic ray spectra revealed recently by CREAM/NUCLEON/DAMPE, as well as the energy-dependent behaviors of the large-scale anisotropies. It is predicted that the dipole anisotropy amplitudes below PeV energies of the Ne, Mg, Si group are smaller than that of the He, C, O group, which can be tested with future measurements.

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A possibility of interpretation of the cosmic ray kneenear 10 TV as a contribution of a single close source

Cited by 2 publications

References 14 publications

Implications on the origin of cosmic rays in light of 10 TV spectral softenings

Implications on the origin of cosmic rays in light of 10 TV spectral softenings

Nearby source interpretation of differences among light and medium composition spectra in cosmic rays

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