How to create Sgr A East: Where did the supernova explode?
Abstract
Sgr A East is the supernova remnant closest to the centre of the Milky Way. Its age has been estimated to be either very young, around 1-2 kyr, or about 10 kyr, and its exact origin remains unclear. We aspire to create a simple model of a supernova explosion that reproduces the shape, size, and location of Sgr A East. Using a simplified hydrodynamical code, we simulated the evolution of a supernova remnant in the medium around the Galactic centre. The latter consists of a nearby massive molecular cloud with which Sgr A East is known to be interacting and a wind from the nuclear star cluster. Our preferred models of the Sgr A East remnant are compatible with an age of around 10 kyr. We also find suitable solutions for older ages, but not for ages younger than 5 kyr. Our simulations predict that the supernova exploded at a distance of about 3.5 pc from the Galactic centre, below the Galactic plane, slightly eastwards from the centre and 3 pc behind it.
Cite
@article{arxiv.2211.04232,
title = {How to create Sgr A East: Where did the supernova explode?},
author = {S. Ehlerová and J. Palouš and M. R. Morris and R. W\" unsch and B. Barna and P. Vermot},
journal= {arXiv preprint arXiv:2211.04232},
year = {2022}
}
Comments
13 pages, 15 figures, accepted by A&A