Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications

Abstract

A multichannel analysis of cosmic ray electron and positron spectra and of the diffuse synchrotron emission of the Galaxy is performed by using the DRAGON code. This study is aimed at probing the interstellar electron source spectrum down to E ~ 1 GeV and at constraining several propagation parameters. We find that above 4 GeV the electron source spectrum is compatible with a power-law of index -2.5. Below 4 GeV instead it must be significantly suppressed and the total lepton spectrum is dominated by secondary particles. The positron spectrum and fraction measured below a few GeV are consistently reproduced only within low reacceleration models. We also constrain the scale-height zt of the cosmic-ray distribution using three independent (and, in two cases, original) arguments, showing that values of z_t < 2 kpc are excluded. This result may have strong implications for particle dark matter searches.

arXiv comment21 pages, 9 figures, 3 tables; accepted for publication in JCAP

References in corpus (40)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Observation of an anomalous positron abundance in the cosmic radiation
• Cosmic-ray propagation and interactions in the Galaxy
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Production and propagation of cosmic-ray positrons and electrons
• A New Model of the Galactic Magnetic Field
• Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• Cosmic Rays below Z=30 in a diffusion model: new constraints on propagation parameters
• Parameterization of Gamma, e^+/- and Neutrino Spectra Produced by p-p Interaction in Astronomical Environment
• The cosmic-ray electron flux measured by the PAMELA experiment between 1 and 625 GeV
• Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
• Constraints on cosmic-ray propagation models from a global Bayesian analysis
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Deriving global structure of the Galactic Magnetic Field from Faraday Rotation Measures of extragalactic sources
• Global cosmic-ray related luminosity and energy budget of the Milky Way
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• The interstellar cosmic-ray electron spectrum from synchrotron radiation and direct measurements
• Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. II: anisotropy
• Galactic electrons and positrons at the Earth:new estimate of the primary and secondary fluxes
• A Markov Chain Monte Carlo technique to sample transport and source parameters of Galactic cosmic rays: II. Results for the diffusion model combining B/C and radioactive nuclei
• Unified interpretation of cosmic-ray nuclei and antiproton recent measurements
• Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties
• The spatial energy spectrum of magnetic fields in our Galaxy
• A common solution to the cosmic ray anisotropy and gradient problems
• $\beta$--Radioactive Cosmic Rays in a diffusion model: test for a local bubble?
• Low-energy break in the spectrum of Galactic cosmic rays
• Spatial Origin of Galactic Cosmic Rays in Diffusion Models: I- Standard sources in the Galactic disk
• Radio data and synchrotron emission in consistent cosmic ray models
• Numerical propagation of high energy cosmic rays in the Galaxy I: technical issues
• Implications of the Cosmic Ray Electron Spectrum and Anisotropy measured with Fermi-LAT
• Deriving the cosmic ray spectrum from gamma-ray observations
• Magnetic structure of our Galaxy: A review of observations
• Diffuse Galactic Gamma Rays at intermediate and high latitudes. I. Constraints on the ISM properties
• Diffuse Galactic Gamma Rays from Shock-Accelerated Cosmic Rays
• Production of Neutrinos and Secondary Electrons in Cosmic Sources
• Cosmic ray models compared to Fermi-LAT positron and electron separate spectra

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• Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
• The origin of Galactic cosmic rays: challenges to the standard paradigm
• Dark Matter and Pulsar Origins of the Rising Cosmic Ray Positron Fraction in Light of New Data From AMS
• A Precision Search for WIMPs with Charged Cosmic Rays
• Galactic cosmic rays after the AMS-02 observations
• Model-Independent Indirect Detection Constraints on Hidden Sector Dark Matter
• Propagation of cosmic rays in the AMS-02 era
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• The Fermi-LAT GeV Excess Traces Stellar Mass in the Galactic Bulge
• Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station
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• Lessons from HAWC PWNe observations: the diffusion constant is not a constant; Pulsars remain the likeliest sources of the anomalous positron fraction; Cosmic rays are trapped for long periods of time in pockets of inefficient diffusion
• Antiprotons from Dark Matter: Current constraints and future sensitivities
• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• Multimessenger constraints on the dark matter interpretation of the Fermi-LAT Galactic center excess
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• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• Galactic factories of cosmic-ray electrons and positrons
• The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations
• Galactic halo size in the light of recent AMS-02 data
• Time dependence of the electron and positron components of the cosmic radiation measured by the PAMELA experiment between July 2006 and December 2015
• Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• First Predicted Cosmic Ray Spectra, Primary-to-Secondary Ratios, and Ionization Rates from MHD Galaxy Formation Simulations
• Secondary antiprotons as a Galactic Dark Matter probe
• Dark matter searches with cosmic antideuterons: status and perspectives
• Cosmic ray propagation and dark matter in light of the latest AMS-02 data
• PAMELA and AMS-02 positron and electron spectra are reproduced by three-dimensional cosmic-ray modeling
• Cosmic-Ray Diffusion Suppression in Star-forming Regions Inhibits Clump Formation in Gas-rich Galaxies
• Implications of current nuclear cross sections on secondary cosmic rays with the upcoming DRAGON2 code
• Signals of a Light Dark Force in the Galactic Center
• Low energy cosmic rays
• Composite Dark Matter and LHC Interplay
• SkyFACT: High-dimensional modeling of gamma-ray emission with adaptive templates and penalized likelihoods
• Direct constraints on diffusion models from cosmic-ray positron data: Excluding the Minimal model for dark matter searches
• The theory of cosmic-ray scattering on pre-existing MHD modes meets data
• Loops and spurs: The angular power spectrum of the Galactic synchrotron background
• The pinching method for Galactic cosmic ray positrons: implications in the light of precision measurements
• Breaks in interstellar spectra of positrons and electrons derived from time-dependent AMS data
• The isotropic radio background revisited
• Production of secondary particles and nuclei in cosmic rays collisions with the interstellar gas using the FLUKA code
• Cosmic ray propagation in galactic turbulence
• Simulating the Galactic Multi-messenger Emissions with HERMES
• Features in cosmic-ray lepton data unveil the properties of nearby cosmic accelerators
• On the progressive hardening of the cosmic-ray proton spectrum in the inner Galaxy
• FLUKA cross sections for cosmic-ray interactions with the DRAGON2 code
• p-wave Annihilating Dark Matter from a Decaying Predecessor and the Galactic Center Excess
• The 130 GeV gamma-ray line and generic dark matter model building constraints from continuum gamma rays, radio and antiproton data
• Constraining the halo size from possible density profiles of hydrogen gas of Milky Way Galaxy
• Anti-Deuterons and Anti-Helium Nuclei from Annihilating Dark Matter
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• Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess
• Updated galactic radio constraints on Dark Matter
• Pulsar interpretation of the lepton spectra measured by AMS-02
• Theoretical interpretation of Pass 8 Fermi-LAT $e^{+}+e^{-}$ data
• Robustness of dark matter constraints and interplay with collider searches for New Physics
• Multimessenger search for electrophilic feebly interacting particles from supernovae
• Implications on Spatial Models of Interstellar Gamma-Ray Inverse-Compton Emission from Synchrotron Emission Studies in Radio and Microwaves
• Turbulent Reacceleration of Streaming Cosmic Rays
• Robust constraints on feebly interacting particles using XMM-Newton
• Cosmic-ray electrons released by supernova remnants
• Contribution of the Galactic center to the local cosmic-ray flux
• Positron Excess from Cosmic Ray Interactions in Galactic Molecular Clouds
• Hints of a Charge Asymmetry in the Electron and Positron Cosmic-Ray Excesses
• LHAASO J2226+6057 as a pulsar wind nebula
• TeV cosmic-ray proton and helium spectra in the myriad model II
• One-point fluctuation analysis of IceCube neutrino events outlines a significant unassociated isotropic component and constrains the Galactic contribution
• Diffuse Synchrotron Emission from Galactic Cosmic Ray Electrons
• The lifetime of cosmic rays in the Milky Way
• Determination of Acceleration Mechanism Characteristics Directly and Non-Parametrically from Observations: Application to Supernova Remnants
• Examining the secondary product origin of cosmic ray positrons with the latest AMS-02 data
• Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess
• Constraining the Higgs portal with antiprotons
• Dark Matter constraints from Planck observations of the Galactic polarized synchrotron emission
• Radio signals from early direct collapse black holes
• Galactic Gamma Ray Background from Interactions of Cosmic Rays
• Polarized synchrotron data and the structure of the Galactic magnetic field
• Constraining the cosmic ray propagation halo thickness using Fermi-LAT observations of high-latitude clouds