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arXiv · astro-ph/9709304

G55.0+0.3: A Highly Evolved Supernova Remnant

B. C. Matthews·B. J. Wallace·A. R. Taylor
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Abstract

Multi-frequency analysis has revealed the presence of a new supernova remnant, G55.0+0.3, in the Galactic plane. A kinematic distance of 14 kpc has been measured from HI spectral line data. The faint, clumpy half-shell is non-thermal and has a physical radius of 70 pc. Using an evolutionary model, the age of the remnant is estimated to be on the order of one million years, which exceeds conventional limits by a factor of five. The remnant may be associated with the nearby pulsar J1932+2020, which has a spin-down age of 1.1 million years. This work implies that the radiative lifetimes of remnants could be much longer than previously suggested.

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B. C. Matthews, B. J. Wallace, A. R. Taylor. 1997-09-30. G55.0+0.3: A Highly Evolved Supernova Remnant. https://doi.org/10.1086/305112

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