How to create Sgr A East: Where did the supernova explode?
S. Ehlerov\'a, J. Palou\v{s}, M. R. Morris, R. W\" unsch, B. Barna, P., Vermot

TL;DR
This paper models the supernova remnant Sgr A East using hydrodynamical simulations to estimate its age and explosion site, suggesting it is about 10,000 years old and exploded near the Galactic centre.
Contribution
It introduces a simplified hydrodynamical model that reproduces Sgr A East's shape, size, and location, providing new estimates for its age and explosion site.
Findings
Sgr A East is likely around 10 kyr old.
The supernova exploded approximately 3.5 pc from the Galactic centre.
Suitable models exclude ages younger than 5 kyr.
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…
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Taxonomy
TopicsHigh-pressure geophysics and materials · Astrophysical Phenomena and Observations · Astro and Planetary Science
