2008/04/15 by David A. Green, D. A. Green, S. P. Reynolds +8 · 3 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.1111/j.1745-3933.2008.00484.x
published as 2008, MNRAS (Letters), 387, L54-L58. · 5 pages, 3 figures, accepted by MNRAS Letters
arxiv created 2008/04/15 · openalex publication_date 2008/05/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abstract Recent radio observations of the small Galactic supernova remnant G1.9+0.3 made at 4.86 GHz with the Very Large Array are presented, and compared with earlier observations at 1.49 GHz which have a comparable resolution (10 × 4 arcsec2). These show that the radio emission from this remnant has expanded significantly, by about 15 per cent over 23 yr, with a current outer diameter of ≈92 arcsec. This expansion confirms that G1.9+0.3 is the youngest Galactic remnant yet identified, only about 150 yr old at most. Recent, lower resolution, 1.43-GHz observations are also discussed, and the integrated flux densities from these and the 4.86-GHz observations are compared with earlier results. This shows that the integrated flux density of G1.9+0.3 has been increasing recently.