Discriminating local sources of high-energy cosmic electrons and positrons by current and future anisotropy measurements

Fang, Kun; Bi, Xiao-Jun; Yin, Peng-Fei

doi:10.1093/mnras/sty1463

Cited by 12 publications

(7 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pulsars represent the leading candidate as primary sources of positrons due to their capability to inject pairs of ± in the medium. Contributions from Geminga and Monogem are commonly used to explain the observed excess and predict anisotropies of amplitude 10 −2 − 10 −3 [3][4][5][6]. Therefore, the measurement of a dipole anisotropy in the positron flux would favor the pulsar origin whereas their absence would favor the more exotic dark matter scenario.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of Positron and Electron Fluxes Measured with the Alpha Magnetic Spectrometer on the ISS

Gonzalez¹,

Casaus²,

Mañá³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

A measurement of the cosmic ray anisotropy on the arrival directions of elementary particles electrons and positrons has been performed in galactic coordinates by the Alpha Magnetic Spectrometer onboard the International Space Station. The analysis is based on the sample of events collected in the first 9 years of data taking. Results are consistent with isotropy and upper limits at the 95% C.I. on the dipole amplitude have been established. In particular, for energies above 16 GeV limits of < 0.36% and < 1.65% are obtained for electrons and positrons respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Anisotropy of Positron and Electron Fluxes Measured with the Alpha Magnetic Spectrometer on the ISS

Gonzalez¹,

Casaus²,

Mañá³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

show abstract

“…The outstanding, yet finite capabilities of AMS-02 in terms of gathering power and bending power will hardly enable the possibility to disentangle which is the dominant source for the positron excess, and only a second-generation spectrometric mission will feature the requirements to precisely profile the spectral features of e + excess in the TeV energies. Additional measurements on the presence of a preferred direction in the arrival direction of high-energy e +/− would provide independent hints towards the identification of localized, nearby astrophysical objects as possible dominating sources of the observed antimatter excess [77,78], providing further information to finally solve this long-standing puzzle.…”

Section: Frontier Physics In Charged Cosmic Raysmentioning

confidence: 99%

Design of an Antimatter Large Acceptance Detector In Orbit (ALADInO)

et al. 2022

View full text Add to dashboard Cite

A new generation magnetic spectrometer in space will open the opportunity to investigate the frontiers in direct high-energy cosmic ray measurements and to precisely measure the amount of the rare antimatter component in cosmic rays beyond the reach of current missions. We propose the concept for an Antimatter Large Acceptance Detector In Orbit (ALADInO), designed to take over the legacy of direct measurements of cosmic rays in space performed by PAMELA and AMS-02. ALADInO features technological solutions conceived to overcome the current limitations of magnetic spectrometers in space with a layout that provides an acceptance larger than 10 m2 sr. A superconducting magnet coupled to precision tracking and time-of-flight systems can provide the required matter–antimatter separation capabilities and rigidity measurement resolution with a Maximum Detectable Rigidity better than 20 TV. The inner 3D-imaging deep calorimeter, designed to maximize the isotropic acceptance of particles, allows for the measurement of cosmic rays up to PeV energies with accurate energy resolution to precisely measure features in the cosmic ray spectra. The operations of ALADInO in the Sun–Earth L2 Lagrangian point for at least 5 years would enable unique revolutionary observations with groundbreaking discovery potentials in the field of astroparticle physics by precision measurements of electrons, positrons, and antiprotons up to 10 TeV and of nuclear cosmic rays up to PeV energies, and by the possible unambiguous detection and measurement of low-energy antideuteron and antihelium components in cosmic rays.

show abstract

“…Extra components above 100 GeV/n may be needed and may be located within relatively short distances, as electrons have a much shorter lifetime with strong energy losses. Young and nearby SNRs may produce a much harder component that gives rise to the excess [71,72].…”

Section: B Electrons and Positronsmentioning

confidence: 99%

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

Zhao,

Fang,

2021

Preprint

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Discriminating local sources of high-energy cosmic electrons and positrons by current and future anisotropy measurements

Cited by 12 publications

References 43 publications

Anisotropy of Positron and Electron Fluxes Measured with the Alpha Magnetic Spectrometer on the ISS

Anisotropy of Positron and Electron Fluxes Measured with the Alpha Magnetic Spectrometer on the ISS

Design of an Antimatter Large Acceptance Detector In Orbit (ALADInO)

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

Contact Info

Product

Resources

About