scholarly journals Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope

2017 ◽  
Vol 95 (8) ◽  
Author(s):  
S. Abdollahi ◽  
M. Ackermann ◽  
M. Ajello ◽  
W. B. Atwood ◽  
L. Baldini ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Large Area ◽  
Electron Positron ◽  
Positron Spectrum

scholarly journals Search for features in the cosmic-ray electron and positron spectrum measured by the Fermi Large Area Telescope

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
M. N. Mazziotta ◽  
F. Costanza ◽  
A. Cuoco ◽  
F. Gargano ◽  
F. Loparco ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Large Area ◽  
Positron Spectrum

scholarly journals On Possible Interpretations of the High Energy Electron-Positron Spectrum Measured by the Fermi Large Area Telescope

2009 ◽  
Author(s):  
D. Grasso ◽  
S. Profumo ◽  
A.W. Strong ◽  
L. Baldini ◽  
R. Bellazzini ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Large Area ◽  
Electron Positron ◽  
Positron Spectrum

scholarly journals An interpretation of the cosmic ray e+ + e− spectrum from 10GeV to 3TeV measured by CALET on the ISS

2019 ◽  
Vol 28 (02) ◽  
pp. 1950035 ◽  
Author(s):  
Saptashwa Bhattacharyya ◽  
Holger Motz ◽  
Yoichi Asaoka ◽  
Shoji Torii
Keyword(s):  
Dark Matter ◽  
Electron Flux ◽  
Simulated Data ◽  
Flux Measurement ◽  
Cosmic Ray ◽  
Electron Positron ◽  
Positron Spectrum ◽  
Extra Electron ◽  
Electron Positron Pair ◽  
Combined Measurements

A combined interpretation of the Calorimetric Electron Telescope (CALET) [Formula: see text] spectrum up to 3[Formula: see text]TeV and the AMS-02 positron spectrum up to 500[Formula: see text]GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron–positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT [Formula: see text]-ray measurement, we show that 3-body decay of a 800[Formula: see text]GeV DM can be compatible with the [Formula: see text]-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.

scholarly journals TeV cosmic-ray electrons from millisecond pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 419-421
Author(s):  
Shota Kisaka ◽  
Norita Kawanaka
Keyword(s):  
Energy Range ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Millisecond Pulsar ◽  
Space Telescope ◽  
Electron Positron ◽  
Positron Spectrum ◽  
Large Peak ◽  
Γ Ray ◽  
Pulsar Wind

AbstractRecent γ-ray observations by the Fermi Gamma-Ray Space Telescope suggest that the γ-ray millisecond pulsar (MSP) population is separated into two subclasses with respect to pair multiplicity. Here, we calculate the cosmic-ray electron/positron spectra from MSPs. Based on the assumption of equipartition in the pulsar-wind region, the typical energy of electrons/positrons ejected by an MSP with pair multiplicity of the order of unity is ~50 TeV. In this case, we find that a large peak in the 10-50 TeV energy range would be observed in the cosmic-ray electron/positron spectrum. Even if the fraction of pair-starved MSPs is 10%, a large peak would be detectable with future missions such as CALET and CTA.

scholarly journals On possible interpretations of the high energy electron–positron spectrum measured by the Fermi Large Area Telescope

2009 ◽  
Vol 32 (2) ◽  
pp. 140-151 ◽  
Author(s):  
D. Grasso ◽  
S. Profumo ◽  
A.W. Strong ◽  
L. Baldini ◽  
R. Bellazzini ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Large Area ◽  
Electron Positron ◽  
Positron Spectrum

scholarly journals Indirect searches for dark matter with the Fermi LAT instrument

2014 ◽  
Vol 29 (22) ◽  
pp. 1430030 ◽  
Author(s):  
M. N. Mazziotta ◽  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Weakly Interacting Massive Particles ◽  
Current Status ◽  
Large Area ◽  
Weakly Interacting ◽  
Electron Positron ◽  
Massive Particles ◽  
Particle Dark Matter

In this review the current status of several searches for particle dark matter with the Fermi Large Area Telescope instrument is presented. In particular, the current limits on the weakly interacting massive particles, obtained from the analyses of gamma-ray and cosmic ray electron/positron data, will be illustrated.

scholarly journals Search for dark matter signatures in the cosmic-ray electron and positron spectrum measured by the Fermi Large Area Telescope

2019 ◽  
Author(s):  
Mario Nicola Mazziotta ◽  
Alessandro Cuoco ◽  
Pedro De La Torre Luque ◽  
Francesco Loparco ◽  
Davide Serini ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Large Area ◽  
Positron Spectrum

scholarly journals Constraining the annihilation of dark matter via cosmic-ray positrons and electrons

2021 ◽  
Vol 2145 (1) ◽  
pp. 012007
Author(s):  
Suwitchaya Setthahirun ◽  
Maneenate Wechakama
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Observational Data ◽  
Cross Section ◽  
Source Function ◽  
Cosmic Ray ◽  
Electron Channel ◽  
Diffusion Loss ◽  
Electron Positron ◽  
Positron Spectrum

Abstract We aim to constrain the properties of dark matter particles by several measurements of positrons and electrons from cosmic-rays. We assume that collisions of dark matter particles and dark matter anti-particles can produce positrons and electrons. The electron-positron propagation is explained by a diffusion-loss equation including loss rates, diffusion, as well as source function. We use data of cosmic-ray positrons and electrons detected by PAMELA, H.E.S.S., AMS-02 and Fermi-LAT. We compare the observational data with the electron and positron spectrum from five annihilation channels in our model to derive constraining factors regarding the cross-section of the annihilation of dark matter. The tightest constraint is provided by cosmic-ray positrons of AMS-02 for the electron channel. Dark matter with mass below a few GeV gets excluded by the cosmic-ray positrons of AMS-02 for the electron, muon and tau channels.

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