Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

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

References (94)

Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope journal April 2017
Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data journal March 2017
High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500 GeV with the Alpha Magnetic Spectrometer on the International Space Station journal September 2014
Cosmic-Ray Positron Energy Spectrum Measured by PAMELA journal August 2013
Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station journal September 2014
Precision Measurement of the ( e + + e − ) Flux in Primary Cosmic Rays from 0.5 GeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station journal November 2014
Evidence for TeV gamma ray emission from Cassiopeia A journal April 2001
Energy Spectrum of Cosmic-Ray Electrons at TeV Energies journal December 2008
The radio spectral index of the Vela supernova remnant journal June 2001
Positron propagation and fluxes from neutralino annihilation in the halo journal December 1998
Recovering the Observed b/c Ratio in a Dynamic Spiral-Armed Cosmic ray Model journal January 2014
New Limits on Dark Matter Annihilation from Alpha Magnetic Spectrometer Cosmic Ray Positron Data journal October 2013
Observation of the 60Fe nucleosynthesis-clock isotope in galactic cosmic rays journal April 2016
AMS-02 Results Support the Secondary Origin of Cosmic Ray Positrons journal November 2013
A new look at the cosmic ray positron fraction journal February 2015
Non-linear diffusive acceleration of heavy nuclei in supernova remnant shocks journal January 2011
Current flow in pulsar magnetospheres journal January 1976
Energetic radiation from rapidly spinning pulsars. I - Outer magnetosphere gaps. II - VELA and Crab journal January 1986
Galactic secondary positron flux at the Earth journal May 2009
Galactic electrons and positrons at the Earth: new estimate of the primary and secondary fluxes journal November 2010
Cosmic ray electrons, positrons and the synchrotron emission of the Galaxy: consistent analysis and implications journal March 2013
Interpretation of AMS-02 electrons and positrons data journal April 2014
Dark matter vs. astrophysics in the interpretation of AMS-02 electron and positron data journal May 2016
The Vela Pulsar’s Proper Motion and Parallax Derived from VLBI Observations journal October 2003
Antiprotons in cosmic rays from neutralino annihilation journal March 2004
Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution journal November 2012
Antiprotons from dark matter annihilation in the Galaxy: Astrophysical uncertainties journal June 2012
Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients journal February 2017
Cosmic ray nuclei, antiprotons and gamma rays in the galaxy: a new diffusion model journal October 2008
Birth and Evolution of Isolated Radio Pulsars journal May 2006
Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station journal July 2013
PAMELA and AMS-02 e + and e − spectra are reproduced by three-dimensional cosmic-ray modeling journal April 2014
Theoretical uncertainties in extracting cosmic-ray diffusion parameters: the boron-to-carbon ratio journal July 2015
Monitoring Stellar Orbits Around the Massive Black hole in the Galactic Center journal February 2009
Constraints on the distribution of supernova remnants with Galactocentric radius journal October 2015
Pulsars as the sources of high energy cosmic ray positrons journal January 2009
Dark matter annihilations and decays after the AMS-02 positron measurements journal March 2014
Parameterization of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\gamma ,\, e^{\pm }$ \end{document} , and Neutrino Spectra Produced by p‐p Interaction in Astronomical Environments journal August 2006
AMS-02 antiprotons reloaded journal October 2015
Galactic cosmic ray propagation models using Picard journal May 2017
Clumpiness of dark matter and the positron annihilation signal journal October 2006
Quantitative study of the AMS-02 electron/positron spectra: Implications for pulsars and dark matter properties journal March 2015
Interpretation of the cosmic ray positron and antiproton fluxes journal March 2017
Dipole anisotropy in cosmic electrons and positrons: inspection on local sources journal January 2017
AMS-02 data confront acceleration of cosmic ray secondaries in nearby sources journal September 2014
Production and Propagation of Cosmic‐Ray Positrons and Electrons journal February 1998
Galactic synchrotron emission with cosmic ray propagation models journal October 2013
Planck intermediate results : XLII. Large-scale Galactic magnetic fields journal December 2016
Maximum Energies of Shock‐accelerated Electrons in Young Shell Supernova Remnants journal November 1999
Theory of pulsars - Polar caps, sparks, and coherent microwave radiation journal February 1975
Indirect dark matter detection with cosmic antimatter book January 2010
Pulsars and Very High-Energy Cosmic-Ray Electrons journal November 1970
Propagation of Cosmic‐Ray Nucleons in the Galaxy journal December 1998
Modelling of the radio emission from the Vela supernova remnant journal January 2014
The Connection Between the Positron Fraction Anomaly and the Spectral Features in Galactic Cosmic-Ray Hadrons journal April 2015
GALPROP WebRun: An internet-based service for calculating galactic cosmic ray propagation and associated photon emissions journal May 2011
A model of the 8-25 micron point source infrared sky journal November 1992
Spiral arms as cosmic ray source distributions journal April 2015
Implications of the AMS-02 positron fraction in cosmic rays journal January 2015
Cosmic-ray positrons from mature gamma-ray pulsars journal March 2001
Pulsars as Gamma Ray Sources: Nebular Shocks and Magnetospheric Gaps book January 1996
Planck intermediate results: VI. The dynamical structure of PLCKG214.6+37.0, a Planck discovered triple system of galaxy clusters journal February 2013
A new look at the cosmic ray positron fraction conference August 2016
Planck intermediate results : XXIV. Constraints on variations in fundamental constants⋆ journal July 2015
Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope collection January 2017
Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station conference March 2016
Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model text January 2008
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
Indirect Dark Matter Detection with Cosmic Antimatter preprint January 2010
Non-linear diffusive acceleration of heavy nuclei in supernova remnant shocks text January 2010
Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant text January 2011
Anisotropic diffusion of galactic cosmic ray protons and their steady-state azimuthal distribution text January 2012
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
Propagation of cosmic-ray nucleons in the Galaxy text January 1998

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

Similar Records

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS