Hydrodynamical and radio evolution of young supernova remnant G1.9+0.3 based on the model of diffusive shock acceleration

Abstract

The radio evolution of, so far the youngest known, Galactic supernova remnant (SNR) G1.9+0.3 is investigated by using three-dimensional (3D) hydrodynamic modelling and non-linear kinetic theory of cosmic ray (CR) acceleration in SNRs. We include consistent numerical treatment of magnetic field amplification (MFA) due to resonant streaming instability. Under the assumption that SNR G1.9+0.3 is the result of a Type Ia supernova explosion located near the Galactic Centre, using widely accepted values for explosion energy 10${}^{51}$ erg and ejecta mass 1.4 $M_{\odot }$, the non-thermal continuum radio emission is calculated. The main purpose of this paper is to explain radio flux brightening measured over recent decades and also predict its future temporal evolution. We estimate that the SNR is now $\sim$ 120 yr old, expanding in an ambient density of 0.02 cm${}^{-3}$, and explain its steep radio spectral index only by means of efficient non-linear diffusive shock acceleration (NLDSA). We also make comparison between simulations and observations of this young SNR, in order to test the models and assumptions suggested. Our model prediction of a radio flux density increase of $\sim$ 1.8 per cent yr${}^{-1}$ during the past two decades agrees well with the measured values. We synthesize the synchrotron spectrum from radio to X-ray and it fits well the VLA, MOST, Effelsberg, Chandra and NuSTAR measurements. We also propose a simplified evolutionary model of the SNR in gamma rays and suggest it may be a promising target for gamma-ray observations at TeV energies with the future generation of instruments like Cherenkov Telescope Array. SNR G1.9+0.3 is the only known Galactic SNR with the increasing flux density and we present here the prediction that the flux density will start to decrease approximately 500 yr from now. We conclude that this is a general property of SNRs in free expansion phase.

arXiv comment16 pages, 11 figures, 1 table; corrected typos, updated references

References in corpus (29)

• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• Simulations of Ion Acceleration at Non-relativistic Shocks. I. Acceleration Efficiency
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• Cosmic ray acceleration and escape from supernova remnants
• Simultaneous Acceleration of Protons and Electrons at Nonrelativistic Quasiparallel Collisionless Shocks
• A kinetic approach to cosmic ray induced streaming instability at supernova shocks
• Observational signatures of particle acceleration in supernova remnants
• Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku
• Magnetic fields in supernova remnants and pulsar-wind nebulae
• A semi-analytical approach to non-linear shock acceleration
• Dynamical Feedback of Self-generated Magnetic Fields in Cosmic Ray Modified Shocks
• Gamma ray emission from SNR RX J1713.7-3946 and the origin of galactic cosmic rays
• The maximum momentum of particles accelerated at cosmic ray modified shocks
• Non-linear shock acceleration in the presence of seed particles
• Non-linear diffusive shock acceleration with free escape boundary
• Numerical simulations of diffusive shock acceleration in SNRs
• A Generalized Model of Nonlinear Diffusive Shock Acceleration Coupled to an Evolving Supernova Remnant
• Supernova Remnants in the Local Group I: A model for the radio luminosity function and visibility times of supernova remnants
• Modified equipartition calculation for supernova remnants
• Shock acceleration of electrons in the presence of synchrotron losses: I. test particle theory
• Unified model for the gamma-ray emission of supernova remnants
• The Hard X-Ray View of the Young Supernova Remnant G1.9+0.3
• Nonthermal Radiation from Supernova Remnants: Effects of Magnetic Field Amplification and Particle Escape
• 3D Simulations of the Thermal X-ray Emission from Young Supernova Remnants Including Efficient Particle Acceleration
• TeV γ-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with H.E.S.S
• Young Remnants of Type Ia Supernovae and Their Progenitors: A Study of SNR G1.9+0.3
• Radio-Continuum Emission From The Young Galactic Supernova Remnant G1.9+0.3
• On the continuum radio-spectrum of Cas A: possible evidence of the non-linear particle acceleration
• The orthogonal fitting procedure for determination of the empirical Σ - D relations for supernova remnants: application to starburst galaxy M82

Cited by in corpus (10)

• Radio Evolution of Supernova Remnants Including Non-linear Particle Acceleration: Insights from Hydrodynamic Simulations
• Radio Observations of Supernova Remnant G1.9+0.3
• Thermal radio absorption as a tracer of the interaction of SNRs with their environments
• On the foundation of equipartition in supernova remnants
• Non-linear diffusive shock acceleration: A recipe for injection of electrons
• Radio Emission from Interstellar Shocks: Young Type Ia Supernova Remnants and the Case of N 103B in the Large Magellanic Cloud
• The two most recent thermonuclear supernovae in the Local Group: radio constraints on their progenitors and evolution
• ATCA Study of Small Magellanic Cloud Supernova Remnant 1E 0102.2-7219
• Supernova remnants in clumpy medium: A model of hydrodynamic and radio synchrotron evolution
• Brightening and Fading in the Youngest Galactic Supernova Remnant G1.9+0.3: 13 years of monitoring with the Chandra X-ray Observatory