G55.0+0.3: A Highly Evolved Supernova Remnant

Details G55.0+0.3: A Highly Evolved Supernova Remnant G55.0+0.3: A Highly Evolved Supernova Remnant

1997-09-30

arxiv.org/abs/astro-ph/9709304v1

Astronomy and Astrophysics

Astrophysics

27 pages, 7 figures in 9 files (figures 1 and 2 require 2 files each), Accepted for publication in The Astrophysical Journal (

Scientific paper

10.1086/305112

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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