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Title: Theoretical Interpretation of Pass 8 Fermi -LAT e + + e - Data

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [4];  [2];  [4];  [5];  [5]; ORCiD logo [4];  [2]; ORCiD logo [6]; ORCiD logo [6];  [6]
  1. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology, Dept. of Physics
  2. Univ. of Torino (Italy). Dept. of Physics; National Inst. of Nuclear Physics, Torino (Italy)
  3. Technical Univ. of Munich, Garching (Germany). Dept. of Physics
  4. Univ. of Pisa (Italy). National Inst. of Nuclear Physics
  5. National Inst. of Nuclear Physics, Torino (Italy)
  6. National Inst. of Nuclear Physics, Pisa (Italy)
+ Show Author Affiliations

The flux of positrons and electrons (e+ + e-) has been measured by the Fermi Large Area Telescope (LAT) in the energy range between 7 GeV and 2 TeV. Here, we discuss a number of interpretations of Pass 8 Fermi-LAT e+ + e- spectrum, combining electron and positron emission from supernova remnants (SNRs) and pulsar wind nebulae (PWNe), or produced by the collision of cosmic rays (CRs) with the interstellar medium. We also found that the Fermi-LAT spectrum is compatible with the sum of electrons from a smooth SNR population, positrons from cataloged PWNe, and a secondary component. If we include in our analysis constraints from the AMS-02 positron spectrum, we obtain a slightly worse fit to the e+ + e- Fermi-LAT spectrum, depending on the propagation model. As an additional scenario, we replace the smooth SNR component within 0.7 kpc with the individual sources found in Green's catalog of Galactic SNRs. We find that separate consideration of far and near sources helps to reproduce the e+ + e- Fermi-LAT spectrum. However, we show that the fit degrades when the radio constraints on the positron emission from Vela SNR (which is the main contributor at high energies) are taken into account. We find that a break in the power-law injection spectrum at about 100 GeV can also reproduce the measured e+ + e-spectrum and, among the CR propagation models that we consider, no reasonable break of the power-law dependence of the diffusion coefficient can modify the electron flux enough to reproduce the observed shape.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1389288
Journal Information:
The Astrophysical Journal (Online), Vol. 845, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Galactic secondary positron flux at the Earth text January 2008
Pulsars as the Sources of High Energy Cosmic Ray Positrons text January 2008
The energy spectrum of cosmic-ray electrons at TeV energies text January 2008
Galactic electrons and positrons at the Earth:new estimate of the primary and secondary fluxes text January 2010
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Non-linear diffusive acceleration of heavy nuclei in supernova remnant shocks text January 2010
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Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications text January 2012
Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station text January 2013
Dark matter annihilations and decays after the AMS-02 positron measurements text January 2013
Galactic synchrotron emission with cosmic ray propagation models text January 2013
Modeling of the Radio Emission from the Vela Supernova Remnant text January 2013
The theory of pulsar wind nebulae text January 2013
Interpretation of AMS-02 electrons and positrons data text January 2014
AMS-02 data confronts acceleration of cosmic ray secondaries in nearby sources text January 2014
Quantitative study of the AMS-02 electron/positron spectra: implications for the pulsar and dark matter properties text January 2014
Spiral Arms as Cosmic Ray Source Distributions text January 2014
Signatures of a two million year old supernova in the spectra of cosmic ray protons, antiprotons and positrons text January 2015
AMS-02 Antiprotons Reloaded text January 2015
Constraints on the distribution of supernova remnants with Galactocentric radius text January 2015
Planck intermediate results. XLII. Large-scale Galactic magnetic fields text January 2016
Interpretation of the cosmic ray positron and antiproton fluxes text January 2016
Dipole anisotropy in cosmic electrons and positrons: inspection on local sources text January 2016
Antiprotons in cosmic rays from neutralino annihilation text January 2003
Production and propagation of cosmic-ray positrons and electrons text January 1997
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Cited By (2)

An interpretation of the cosmic ray e+ + e− spectrum from 10GeV to 3TeV measured by CALET on the ISS journal January 2019
Multimessenger Multi-TeV Dark Matter journal April 2019

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