Nonthermal properties of supernova remnant G1.9+0.3

TL;DR

This paper models the nonthermal emission of the young supernova remnant G1.9+0.3 using nonlinear kinetic theory, predicting its gamma-ray flux and physical parameters based on observed data.

Contribution

It provides a detailed theoretical analysis of G1.9+0.3's nonthermal properties, including gamma-ray emission predictions, assuming a Type Ia supernova origin near the Galactic center.

Findings

Predicted TeV gamma-ray flux is very low (~5×10⁻¹⁵ erg cm⁻² s⁻¹).

Gamma-ray flux strongly depends on the source distance (∝ d⁻¹¹).

Physical parameters consistent with a young Type Ia supernova remnant.

Abstract

The properties of the - presumably - youngest Galactic supernova remnant (SNR) G1.9+0.3 are investigated within the framework of nonlinear kinetic theory of cosmic ray acceleration in SNRs. The observed angular size and expansion speed as well as the radio and X-ray emission measurements are used to determine relevant physical parameters of this SNR. Under the assumption that SNR G1.9+0.3 is the result of a Type Ia supernova near the Galactic center (at the distance d=8.5 kpc) the nonthermal properties are calculated. In particular, the expected TeV gamma-ray spectral energy density is predicted to be as low as $\epsilon_{\gamma}F_{\gamma} \approx 5\times 10^{-15}$ erg cm$^{-2}$ s$^{-1}$, strongly dependent ($F_{\gamma}\propto d^{-11}$) upon the source distance d.