The radio expansion and brightening of the very young supernova remnant G1.9+0.3
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- June 2008
- DOI:
- 10.1111/j.1745-3933.2008.00484.x
- arXiv:
- arXiv:0804.2317
- Bibcode:
- 2008MNRAS.387L..54G
- Keywords:
-
- ISM: individual: G1.9+0.3;
- supernova remnants;
- radio continuum: ISM;
- Astrophysics
- E-Print:
- 5 pages, 3 figures, accepted by MNRAS Letters