Radio Spectral Index and Expansion of 3C58

Details Radio Spectral Index and Expansion of 3C58 Radio Spectral Index and Expansion of 3C58

2001-06-19

arxiv.org/abs/astro-ph/0106334v1

Astronomy and Astrophysics

Astrophysics

18 pages, 7 Figures, Latex, Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/323066

We present new observations of the plerionic supernova remnant 3C58 with the VLA at 74 and 327 MHz. In addition, we re-reduced earlier observations at 1.4 and 4.9 GHz taken in 1973 and 1984. Comparing these various images, we find that: 1. the remnant has a flat and relatively uniform spectral index distribution, 2. any expansion of the remnant with time is significantly less than that expected for uniform, undecelerated expansion since the generally accepted explosion date in 1181 A.D., and 3. there is no evidence for a non-thermal synchrotron emission shell generated by a supernova shock wave, with any such emission having a surface brightness of <1 x 10^(-21) W / (m^2 Hz sr) at 327 MHz.

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