Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope

Ackermann, M.

doi:10.1103/PhysRevLett.108.011103

Title: Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope

Journal Article · Thu Jan 05 00:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.108.011103· OSTI ID:1356772

Ackermann, M. ^[1]

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); et al.

We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting the Earth’s shadow, which is offset in opposite directions for opposite charges due to the Earth’s magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 GeV and 200 GeV. We confirm that the fraction rises with energy in the 20–100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356772

Alternate ID(s):: OSTI ID: 1098536

Journal Information:: Physical Review Letters, Vol. 108, Issue 1; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 436 works

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Planck 2015 results. XIII. Cosmological parameters Collaboration, Planck; Ade, P. A. R.; Aghanim, N. arXiv https://doi.org/10.48550/arxiv.1502.01589	text	January 2015
Constraints on Dark Photon from Neutrino-Electron Scattering Experiments Bilmis, S.; Turan, I.; Aliev, T. M. arXiv https://doi.org/10.48550/arxiv.1502.07763	text	January 2015
Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck Slatyer, Tracy R. arXiv https://doi.org/10.48550/arxiv.1506.03811	text	January 2015
A review of indirect searches for particle dark matter Gaskins, Jennifer M. arXiv https://doi.org/10.48550/arxiv.1604.00014	text	January 2016
Testing the dark matter scenario in the inert doublet model by future precision measurements of the Higgs boson couplings Kanemura, Shinya; Kikuchi, Mariko; Sakurai, Kodai arXiv https://doi.org/10.48550/arxiv.1605.08520	text	January 2016
Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess Buch, Jatan; Ralegankar, Pranjal; Rentala, Vikram arXiv https://doi.org/10.48550/arxiv.1609.04821	text	January 2016
Constraints on the Primordial Black Hole Abundance from the First Advanced LIGO Observation Run Using the Stochastic Gravitational-Wave Background Wang, Sai; Wang, Yi-Fan; Huang, Qing-Guo arXiv https://doi.org/10.48550/arxiv.1610.08725	text	January 2016
HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess Hooper, Dan; Cholis, Ilias; Linden, Tim arXiv https://doi.org/10.48550/arxiv.1702.08436	text	January 2017
WIMP dark matter candidates and searches - current status and future prospects Roszkowski, Leszek; Sessolo, Enrico Maria; Trojanowski, Sebastian arXiv https://doi.org/10.48550/arxiv.1707.06277	text	January 2017
HelMod in the works: from direct observations to the local interstellar spectrum of cosmic-ray electrons Boschini, M. J.; Della Torre, S.; Gervasi, M. arXiv https://doi.org/10.48550/arxiv.1801.04059	text	January 2018
Dark Matter in Anomaly-Free Gauge Extensions Bauer, Martin; Diefenbacher, Sascha; Plehn, Tilman arXiv https://doi.org/10.48550/arxiv.1805.01904	text	January 2018
Positron flux and gamma-ray emission from Geminga pulsar and pulsar wind nebula Tang, Xiaping; Piran, Tsvi arXiv https://doi.org/10.48550/arxiv.1808.02445	text	January 2018
Gamma Ray polarimetry; a new window for the non-thermal Universe Ilie, Cosmin arXiv https://doi.org/10.48550/arxiv.1906.02824	text	January 2019
Towards Understanding the Origin of Cosmic-Ray Positrons Aguilar, M.; Ali Cavasonza, L.; Ambrosi, G. Karlsruhe https://doi.org/10.5445/ir/1000091150	text	January 2019

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