Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Yuan, Qiang

doi:10.1007/s11433-018-9300-0

Cited by 37 publications

(49 citation statements)

References 47 publications

(82 reference statements)

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“…3 is described by a convection gradient dv c /d|z| which may lie anywhere from 0 (no convection) up to 200 km/s/kpc. By comparison, the AMS-02 data gives a local convection gradient < ∼ 10 km/s (in agreement with [130,[134][135][136]), although some works [59] have given values for the local convection velocity of up to 45 km/s, suggesting a substantial uncertainty on the convection gradient.…”

Section: B Template Modeling: Including Astrophysical Uncertaintiessupporting

confidence: 73%

“…By comparison, locally measured cosmic rays suggest values in the range of 20 − 30 km/s, as we show in our Table I. Similarly [134] constrain v A from cosmic ray observations to be locally within 26−32 km/s, while [131] give two ranges for v A , to be between 0 and 22 km/s when using only light nuclei cosmic-ray species and between 16 and 44 km/s when using more massive nuclei. Instead, [130] and [137] get values for v A as high as 67 km/s and 63 km/s respectively.…”

Section: B Template Modeling: Including Astrophysical Uncertaintiessupporting

confidence: 69%

“…1). Our prior range is significantly wider than the range D 0 (2 − 8) × 10 28 cm 2 /s based only on local ISM cosmic-ray measurements [131,134].…”

Section: B Template Modeling: Including Astrophysical Uncertaintiesmentioning

confidence: 86%

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The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations

Cholis,

Zhong,

McDermott

et al. 2021

Preprint

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The Galactic center excess (GCE) remains one of the most intriguing discoveries from the Fermi Large Area Telescope (LAT) observations. We revisit the characteristics of the GCE by first producing a new set of high-resolution galactic diffuse gamma-ray emission templates. This diffuse emission, which accounts for the bulk of the observed gamma rays, is ultimately due to cosmic-ray interactions with the interstellar medium. Using recent high-precision cosmic-ray observations, in addition to the continuing Fermi-LAT observations and observations from lower energy photons, we constrain the properties of the galactic diffuse emission. We describe a large set of diffuse gammaray emission templates which account for a very wide range of initial assumptions on the physical conditions in the inner galaxy. The broad properties of the GCE that we find in this work are qualitatively unchanged despite the introduction of this new set of templates, though its quantitative features appear mildly different than those obtained in previous analyses. In particular, we find a high-energy tail at higher significance than previously reported. This tail is very prominent in the northern hemisphere, and less so in the southern hemisphere. This strongly affects one prominent interpretation of the excess: known millisecond pulsars are incapable of producing this high-energy emission, even in the relatively softer southern hemisphere, and are therefore disfavored as the sole explanation of the GCE. The annihilation of dark matter particles of mass 40 +10 −7 GeV (95% CL) to b quarks with a cross-section of σAv = 1.4 +0.6 −0.3 × 10 −26 cm 3 s −1 provides a good fit to the excess especially in the relatively cleaner southern sky. Dark matter of the same mass range annihilating to b quarks or heavier dark matter particles annihilating to heavier Standard Model bosons can combine with millisecond pulsars to provide a good fit to the southern hemisphere emission as well, as can a broken power-law spectrum which would be related to recent cosmic-ray burst activity. As part of this paper, we make publicly available all of our templates and the data covariance matrix we have generated to account for systematic uncertainties.

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Section: B Template Modeling: Including Astrophysical Uncertaintiessupporting

confidence: 73%

Section: B Template Modeling: Including Astrophysical Uncertaintiessupporting

confidence: 69%

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The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations

Cholis,

Zhong,

McDermott

et al. 2021

Preprint

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“…Besides the precise measurements of carbon flux, B/C, and Be/B ratios from AMS-02 [15,16], other data are also included for better parameter constraints, which are listed in Table I. For the carbon flux, we use the CALET [19], NUCLEON [28], and CREAM-II [46] measurements to cover the multi-TeV energy region and the ACE-CRIS measurements [47] to cover the MeV energy region. The low-energy B/C ratio is constrained by the ACE-CRIS data [47].…”

Section: B Data Setsmentioning

confidence: 99%

Constraints on the spatially dependent cosmic-ray propagation model from Bayesian Analysis

Zhao,

Fang,

2021

Preprint

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The energy spectra of primary and secondary cosmic rays (CR) generally harden at several hundreds of GeV, which can be naturally interpreted by propagation effects. We adopt a spatially dependent CR propagation model to fit the spectral hardening, where a slow-diffusion disk (SDD) is assumed near the Galactic plane. We aim to constrain the propagation parameters with the Bayesian parameter estimation based on a Markov chain Monte Carlo sampling algorithm. The latest precise measurements of carbon spectrum and B/C ratio are adopted in the Bayesian analysis. The 10 Be/ 9 Be and Be/B ratios are also included to break parameter degeneracies. The fitting result shows that all the parameters are well constrained. Especially, the thickness of the SDD is limited to 0.4-0.5 kpc above and below the Galactic plane, which could be the best constraint for the slow-diffusion region among similar works. The p/p ratio and amplitude of CR anisotropy predicted by the SDD model are consistent with the observations, while the predicted high-energy electron and positron fluxes are slightly and significantly lower than the observations, respectively, indicating the necessity of extra sources.

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“…In this work, we adopt the diffusion-reacceleration model to calculate the propagation process of CREs in the Milky Way [76,77]. The propagation parameters we use are summarized in Table 1, which follow Ref.…”

Section: Cosmic Ray Propagationmentioning

confidence: 99%

Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

Liu

Kang

Yuan

et al. 2020

J. Cosmol. Astropart. Phys.

Self Cite

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The precise measurements of energy spectra of cosmic ray positrons and/or electrons by recent experiments show clear excesses above 10 GeV. Moreover, a potential sharp spectral feature was suggested by the Dark Matter Particle Explorer (DAMPE) data. These results inspire quite a number of discussions on the connection with either the annihilation/decay of dark matter (DM) or the astrophysical origins. Here we discuss a dark matter (DM) scenario in which DM particles could annihilate and decay into standard model particle pairs simultaneously. In this model, the peak structure is due to the DM annihilation in a nearby subhalo and the broad positron/electron excesses are due to the decay of DM in the Milky Way. This model can reasonably fit the DAMPE and AMS-02 data of the total e + e − spectra and the positron fraction, with model parameters being consistent with existing constraints. A simple realization of such a DM model is the spin-1 vector DM model.

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Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Cited by 37 publications

References 47 publications

The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations

The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations

Constraints on the spatially dependent cosmic-ray propagation model from Bayesian Analysis

Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

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