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The radio expansion and brightening of the very young supernova remnant G1.9 + 0.3
Article first published online: 15 MAY 2008
DOI: 10.1111/j.1745-3933.2008.00484.x
© 2008 The Authors. Journal compilation © 2008 RAS
Issue
Monthly Notices of the Royal Astronomical Society: Letters
Volume 387, Issue 1, pages L54–L58, June 2008
Additional Information
How to Cite
Green, D. A., Reynolds, S. P., Borkowski, K. J., Hwang, U., Harrus, I. and Petre, R. (2008), The radio expansion and brightening of the very young supernova remnant G1.9 + 0.3. Monthly Notices of the Royal Astronomical Society: Letters, 387: L54–L58. doi: 10.1111/j.1745-3933.2008.00484.x
Publication History
- Issue published online: 15 MAY 2008
- Article first published online: 15 MAY 2008
- Accepted 2008 April 14. Received 2008 April 10
- Abstract
- Article
- References
- Cited By
Keywords:
- ISM: individual: G1.9 + 0.3;
- supernova remnants;
- radio continuum: ISM
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.