A VLA Archive Observation of the Youngest Known Galactic Supernova Remnant G1.9+0.3

TL;DR

This paper analyzes archival VLA data of the youngest known Galactic supernova remnant G1.9+0.3, estimating its expansion rate and age, confirming its rapid growth and recent origin.

Contribution

First analysis of archival VLA data to determine the expansion rate and age of G1.9+0.3, providing new insights into its evolution.

Findings

Expansion rate of 0.46% per year

Estimated age of approximately 220 years

Consistent with previous size evolution studies

Abstract

We present the analysis of an unpublished VLA archive observation made at 1.49 GHz in 1989 toward the supernova remnant G1.9+0.3, the youngest such Galactic object known. This observation agrees with the time evolution in angular size previously reported. We derive an expansion rate of 0.46 +- 0.11 % per year and an age of 220+45-70 yr for the remnant by comparing the 1985 and 1989 images.