description G1.9+0.3 Overview
G1.9+0.3 is a supernova remnant located near the center of the Milky Way galaxy in the constellation Sagittarius. Discovered through combined radio and X-ray observations, it was identified in 2008 as the youngest known supernova remnant in our galaxy, with an estimated age of around 100 years at the time of discovery. The remnant was first detected in radio observations, but its youth was only recognized when X-ray observations showed significant expansion over a relatively short period. Due to heavy obscuration by interstellar dust along the line of sight, the supernova explosion that created G1.9+0.3 was not observed directly from Earth, making it unusual among known galactic supernovae.
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What is G1.9+0.3?
G1.9+0.3 is a supernova remnant near the center of the Milky Way in Sagittarius. It is known for being the youngest known supernova remnant identified in our galaxy.
How old is G1.9+0.3?
Expansion measurements indicate that the remnant is roughly a century to a century and a half old. The estimate comes from comparing its changing size in radio and X-ray observations.
How was G1.9+0.3 identified as a young supernova remnant?
Astronomers combined observations from NASA's Chandra X-ray Observatory and the Very Large Array radio telescope. Radio images from 1985 and 2008 showed measurable expansion, supporting its unusually young age.
Why was the supernova that created G1.9+0.3 not seen from Earth?
The remnant lies close to the Milky Way's crowded, dusty central region, which can obscure visible light. Radio and X-ray observations were therefore especially important for studying it.
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