scholarly journals Search for dark matter cosmic-ray electrons and positrons from the Sun with the Fermi Large Area Telescope

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
A. Cuoco ◽  
P. De La Torre Luque ◽  
F. Gargano ◽  
M. Gustafsson ◽  
F. Loparco ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
The Sun ◽  
Large Area ◽  
Electrons And Positrons

scholarly journals A possible radio signal of annihilating dark matter in the Abell 4038 cluster

2019 ◽  
Vol 495 (1) ◽  
pp. L124-L128 ◽  
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Radio Signal ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Annihilation Cross Section ◽  
Radio Continuum ◽  
Test Statistic ◽  
Large Area ◽  
Dark Matter Annihilation

ABSTRACT In the past decade, some telescopes [e.g. Fermi-Large Area Telescope (LAT), Alpha Magnetic Spectrometer(AMS), and Dark Matter Particle Explorer(DAMPE)] were launched to detect the signals of annihilating dark matter in our Galaxy. Although some excess of gamma-rays, antiprotons, and electrons/positrons have been reported and claimed as dark matter signals, the uncertainties of Galactic pulsars’ contributions are still too large to confirm the claims. In this Letter, we report a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming the thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we get very large test statistic values >45 for four popular annihilation channels, which correspond to more than 6.5σ statistical preference. This provides a very strong evidence for the existence of annihilating dark matter. In particular, our results also support the recent claims of dark matter mass m ≈ 30–50 GeV annihilating via the bb̄ quark channel with the thermal annihilation cross-section.

scholarly journals Search for dark matter signatures in the gamma-ray emission towards the Sun with the Fermi Large Area Telescope

2020 ◽  
Vol 102 (2) ◽  
Author(s):  
M. N. Mazziotta ◽  
F. Loparco ◽  
D. Serini ◽  
A. Cuoco ◽  
P. De La Torre Luque ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
The Sun ◽  
Large Area ◽  
Gamma Ray Emission

scholarly journals Perspectives for indirect dark matter search with AMS-2 using cosmic-ray electrons and positrons

2009 ◽  
Vol 11 (10) ◽  
pp. 105021 ◽  
Author(s):  
B Beischer ◽  
P von Doetinchem ◽  
H Gast ◽  
T Kirn ◽  
S Schael
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Dark Matter Search ◽  
Electrons And Positrons

scholarly journals The cosmic-ray content of the Orion-Eridanus superbubble

2020 ◽  
Vol 635 ◽  
pp. A96 ◽  
Author(s):  
T. Joubaud ◽  
I. A. Grenier ◽  
J. M. Casandjian ◽  
T. Tolksdorf ◽  
R. Schlickeiser
Keyword(s):  
Cosmic Rays ◽  
Galactic Plane ◽  
Cosmic Ray ◽  
Significant Loss ◽  
Particle Energy ◽  
Stellar Winds ◽  
The Sun ◽  
Large Area ◽  
Average Spectrum ◽  
Cosmic Ray Flux

Aims. The nearby Orion-Eridanus superbubble, which was blown by multiple supernovae several million years ago, has likely produced cosmic rays. Its turbulent medium is still energised by massive stellar winds and it can impact cosmic-ray transport locally. The γ radiation produced in interactions between cosmic rays and interstellar gas can be used to compare the cosmic-ray spectrum in the superbubble and in other regions near the Sun. It can reveal spectral changes induced in GeV to TeV cosmic rays by the past and present stellar activity in the superbubble. Methods. We used ten years of data from the Fermi Large Area Telescope (LAT) in the 0.25–63 GeV energy range to study the closer (Eridanus) end of the superbubble at low Galactic latitudes. We modelled the spatial and spectral distributions of the γ rays produced in the different gas phases (atomic, molecular, dark, and ionised) of the clouds found in this direction. The model included other non-gaseous components to match the data. Results. We found that the γ-ray emissivity spectrum of the gas along the outer rim and in a shell inside the superbubble is consistent with the average spectrum measured in the solar neighbourhood. It is also consistent with the cosmic-ray spectrum directly measured in the Solar System. This homogeneity calls for a detailed assessment of the recent supernova rate and current census of massive stellar winds in the superbubble in order to estimate the epoch and rate of cosmic-ray production and to constrain the transport conditions that can lead to such homogeneity and little re-acceleration. We also found significant evidence that a diffuse atomic cloud lying outside the superbubble, at a height of 200–250 pc below the Galactic plane, is pervaded by a 34% lower cosmic-ray flux, but with the same particle energy distribution as the local one. Super-GeV cosmic rays should freely cross such a light and diffuse cirrus cloud without significant loss or spectral distorsion. We tentatively propose that the cosmic-ray loss relates to the orientation of the magnetic field lines threading the cirrus, which point towards the halo according to the dust polarisation data from Planck. Finally, we gathered the present emissivity measurements with previous estimates obtained around the Sun to show how the local cosmic-ray flux decreases with Galactic height and to compare this trend with model predictions.

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 Observations of Forbush Decreases of Cosmic-Ray Electrons and Positrons with the Dark Matter Particle Explorer

2021 ◽  
Vol 920 (2) ◽  
pp. L43
Author(s):  
Francesca Alemanno ◽  
Qi An ◽  
Philipp Azzarello ◽  
Felicia Carla Tiziana Barbato ◽  
Paolo Bernardini ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Forbush Decreases ◽  
Electrons And Positrons

scholarly journals Neutrinos from Cosmic Ray Interactions in the Sun as background for dark matter searches

2017 ◽  
Author(s):  
Moritz Lotze ◽  
M. Ardid. ◽  
I. Felis ◽  
Christoph Tönnis ◽  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
The Sun ◽  
Cosmic Ray Interactions

scholarly journals Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun

2011 ◽  
Vol 84 (3) ◽  
Author(s):  
M. Ajello ◽  
W. B. Atwood ◽  
L. Baldini ◽  
G. Barbiellini ◽  
D. Bastieri ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
High Energy ◽  
The Sun

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
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