科研之友
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摘要
We present radio maps of the historical supernova remnant G11.2-0.3 in the frequency range from 4.85 GHz to 32 GHz. The integrated spectrum with alpha = 0.50 (S similar to v(alpha)) is dominated by its steep spectrum shell emission (alpha similar to -0.57), although a at spectrum core structure classifies G11.2-0.3 as a composite supernova remnant. A radial magnetic field structure is observed. An analysis of the multi-frequency polarization data results in highly varying rotation measures along the shell. The percentage polarization is rather low (similar to2%) and we conclude that G11.2-0.3 is in the transient phase from free to adiabatic expansion. The central at spectrum component is partly resolved. A compact radio source with an inverted spectrum likely coincides with the previously detected X-ray pulsar (Torii et al. 1997). Two symmetric structures with at radio spectra possibly indicate a bipolar outflow. Combining available X-ray and radio data we conclude that G11.2-0.3 is likely the remnant of a type II supernova explosion with an early type B progenitor star.
- 出版日期2001-6
