A New Model For Vela Jr. Supernova Remnant

TL;DR

This paper models Vela Jr. as an old supernova remnant outside Vela SNR, explaining its broadband spectrum and gamma-ray flux through a hydrodynamical approach that aligns with observational data.

Contribution

It introduces a new hydrodynamical model for Vela Jr., positioning it outside Vela SNR and explaining its high-energy emissions without requiring extreme cosmic ray energy fractions.

Findings

Vela Jr. is located 600 pc away and is approximately 17,500 years old.

The model successfully reproduces radio, X-ray, and gamma-ray observations.

The gamma-ray flux is explained by a hadronic mechanism within a low-density environment.

Abstract

We consider Vela Jr. as being the old Supernova Remnant (SNR) at the beginning of the transition from adiabatic to radiative stage of evolution. According to our model, Vela Jr. is situated outside Vela SNR at the distance of 600 pc and its age is 17500 yr. We model the high energy fluxes from Vela Jr. and its broadband spectrum. We find our results compatible with experimental data in radio waves, X- and gamma-rays. Our hydrodynamical model of Vela Jr. explains the observed TeV gamma-ray flux by hadronic mechanism. The proposed model does not contradict to the low density environment of the SNR and does not need extreme fraction of the explosion energy to be transferred to Cosmic Rays.