A local fading accelerator and the origin of TeV cosmic ray electrons

Abstract

The total cosmic ray electron spectrum (electrons plus positrons) exhibits a break at a particle energy of $\sim 1\mathrm{TeV}$ and extends without any attenuation up to $\sim 20\mathrm{TeV}$. Synchrotron and inverse Compton energy losses strongly constrain both the age and the distance of the potential sources of TeV and multi-TeV electrons to $\approx 10^5\mathrm{yr}$ and $\approx 100-500\mathrm{pc}$, depending on both the absolute value and energy dependence of the cosmic ray diffusion coefficient. This suggests that only a few, or just one nearby discrete source may explain the observed spectrum of high energy electrons. On the other hand the measured positron fraction, after initially increasing with particle energy, saturates at a level well below 0.5 and likely drops above $\sim 400-500$ GeV. This means that the local source(s) of TeV electrons should not produce positrons in equal amount, ruling out scenarios involving pulsars/pulsar winds as the main sources of high energy leptons. In this paper we show that a single, local, and fading source can naturally account for the entire spectrum of cosmic ray electrons in the TeV domain. Even though the nature of such source remains unclear, we discuss known cosmic ray accelerators, such as supernova remnant and stellar wind shocks, which are believed to accelerate preferentially electrons rather than positrons.

References in corpus (23)

• Cosmic-ray propagation and interactions in the Galaxy
• Physical Properties of Wolf-Rayet Stars
• The energy spectrum of cosmic-ray electrons at TeV energies
• Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Pulsars as the Sources of High Energy Cosmic Ray Positrons
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• The cosmic-ray electron flux measured by the PAMELA experiment between 1 and 625 GeV
• Constraints on cosmic-ray propagation models from a global Bayesian analysis
• The origin of the positron excess in cosmic rays
• The cosmic-ray positron energy spectrum measured by PAMELA
• Cosmic-ray electron+positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
• Energy Spectrum of Cosmic-ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station
• Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
• Imprints of Cosmic Rays in Multifrequency Observations of the Interstellar Emission
• Measurement of Cosmic-ray Electrons at TeV Energies by VERITAS
• Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
• Modeling of the Vela complex including the Vela supernova remnant, the binary system gamma2 Velorum, and the Gum nebula
• Measuring the Local Diffusion Coefficient with H.E.S.S. Observations of Very High-Energy Electrons
• Undiscovered pulsar in the Local Bubble as an explanation of the local high energy cosmic ray all-electron spectrum
• Time Evolution of Gamma Rays from Supernova Remnants
• Multi-messenger constraints to the local emission of cosmic-ray electrons

Cited by in corpus (19)

• Galactic factories of cosmic-ray electrons and positrons
• Gamma-ray halos around pulsars as the key to understanding cosmic ray transport in the Galaxy
• Does the Geminga, Monogem and PSR J0622+3749 $\gamma$-ray halos imply slow diffusion around pulsars?
• Stochastic Fluctuations of Low-Energy Cosmic Rays and the Interpretation of Voyager Data
• Features in cosmic-ray lepton data unveil the properties of nearby cosmic accelerators
• Signature of Energy Losses on the Cosmic Ray Electron Spectrum
• On particle acceleration and transport in plasmas in the Galaxy: theory and observations
• Constraining positron emission from pulsar populations with AMS-02 data
• Interpretation of the excess of antiparticles within a modified paradigm of galactic cosmic rays
• A diffusive origin for the cosmic-ray spectral hardening reveals signatures of a nearbysource in the leptons and protons data
• High-Statistics Measurement of the Cosmic-Ray Electron Spectrum with H.E.S.S
• Electron and positron spectra in the three dimensional spatial-dependent propagation model
• Gamma-ray halos around pulsars: impact on pulsar wind physics and galactic cosmic ray transport
• Cosmic ray driven galactic winds
• Cosmic-ray electrons released by supernova remnants
• Monte Carlo Study of Electron and Positron Cosmic-Ray Propagation with the CALET Spectrum
• Search for galactic Pevatron candidates in a population of unidentified gamma-ray sources
• Disclosing the catalog pulsars dominating the Galactic positron flux
• SECRET: Stochasticity Emulator for Cosmic Ray Electrons