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

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We present the analysis of an unpublished VLA archive observation made at 1.49 GHz in 1989 toward the supernova remnant G1.9+0.3, the youngest such Galactic object known.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±70₄₅ 45 yr for the remnant by comparing the 1985 and 1989 images.