Investigating the CREDIT history of supernova remnants as cosmic-ray sources
arXiv:2409.11012 · doi:10.3847/2041-8213/adaea8
Abstract
Supernova remnants (SNRs) have long been suspected to be the primary sources of Galactic cosmic rays. Over the past decades, great strides have been made in the modelling of particle acceleration, magnetic field amplification, and escape from SNRs. Yet, while many SNRs have been observed in non-thermal emission in radio, X-rays, and gamma-rays, there is no evidence for any individual object contributing to the locally observed flux. Here, we propose a particular spectral signature from individual remnants that is due to the energy-dependent escape from SNRs. For young and nearby sources, we predict fluxes enhanced by tens of percent in narrow rigidity intervals; given the percent-level flux uncertainties of contemporary cosmic-ray data, such features should be readily detectable. We model the spatial and temporal distribution of sources and the resulting distribution of fluxes with a Monte Carlo approach. The decision tree that we have trained on simulated data is able to discriminate with very high significance between the null hypothesis of a smooth distribution of sources and the scenario with a stochastic distribution of individual sources. We suggest that this cosmic-ray energy-dependent injection time (CREDIT) scenario be considered in experimental searches to identify individual SNRs as cosmic-ray sources.
arXiv comment8 pages, 3 figures, 1 table
References in corpus (31)
- Scikit-learn: Machine Learning in Python
- The Interstellar Environment of our Galaxy
- Broad-band nonthermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants
- Cosmic ray acceleration and escape from supernova remnants
- Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite
- The 1st Fermi Lat Supernova Remnant Catalog
- A revised catalogue of 294 Galactic supernova remnants
- The origin of Galactic cosmic rays: challenges to the standard paradigm
- Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. I: spectrum and chemical composition
- Electron acceleration in SNR and diffuse gamma-rays above 1 GeV
- Dynamical Feedback of Self-generated Magnetic Fields in Cosmic Ray Modified Shocks
- On the escape of particles from cosmic ray modified shocks
- Non-linear diffusion of cosmic rays escaping from supernova remnants - I. The effect of neutrals
- Cosmic ray acceleration in young supernova remnants
- Cosmic ray acceleration at oblique shocks
- AMS-100: The Next Generation Magnetic Spectrometer in Space -- An International Science Platform for Physics and Astrophysics at Lagrange Point 2
- Nearby supernova remnants and the cosmic-ray spectral hardening at high energies
- Kinetic Simulations of Cosmic-Ray-Modified Shocks II: Particle Spectra
- The low rate of Galactic pevatrons
- Exploring particle escape in supernova remnants through gamma rays
- Cosmic Ray Models
- Non-linear diffusion of cosmic rays escaping from supernova remnants - II. Hot ionized media
- Diffuse Emission of Galactic High-Energy Neutrinos from a Global Fit of Cosmic Rays
- Cosmic ray electrons and positrons from discrete stochastic sources
- Constraints on leptophilic dark matter from the AMS-02 experiment
- Stochastic cosmic ray sources and the TeV break in the all-electron spectrum
- Stochastic Fluctuations of Low-Energy Cosmic Rays and the Interpretation of Voyager Data
- Stable laws and cosmic ray physics
- Grammage of cosmic rays in the proximity of supernova remnants embedded in a partially ionized medium
- Deciphering Residual Emissions: Time-Dependent Models for the Non-Thermal Interstellar Radiation from the Milky Way
- Measurement of the cosmic p+He energy spectrum from 50 GeV to 0.5 PeV with the DAMPE space mission