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Title:
The radio expansion and brightening of the very young supernova remnant G1.9+0.3
Authors:
Green, D. A.; Reynolds, S. P.; Borkowski, K. J.; Hwang, U.; Harrus, I.; Petre, R.
Affiliation:
AA(Astrophysics Group, Cavendish Laboratory, 19 J. J. Thomson Avenue, Cambridge CB3 0HE), AB(Department of Physics, North Carolina State University, Raleigh NC 27695-8202, USA), AC(Department of Physics, North Carolina State University, Raleigh NC 27695-8202, USA), AD(NASA/GSFC, Code 660, Greenbelt, MD 2077, USA), AE(NASA/GSFC, Code 660, Greenbelt, MD 2077, USA), AF(NASA/GSFC, Code 660, Greenbelt, MD 2077, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 387, Issue 1, pp. L54-L58. (MNRAS Homepage)
Publication Date:
06/2008
Origin:
MNRAS
MNRAS Keywords:
ISM: individual: G1.9+0.3, supernova remnants, radio continuum: ISM
DOI:
10.1111/j.1745-3933.2008.00484.x
Bibliographic Code:
2008MNRAS.387L..54G

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.
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