2001A&A...372..627K -
Astronomy and Astrophysics, volume 372, 627-635 (2001/6-3)
A high frequency radio study of G11.2-0.3, a historical supernova remnant with a flat spectrum core.
KOTHES R. and REICH W.
Abstract (from CDS):
We present radio maps of the historical supernova remnant G11.2-0.3 in the frequency range from 4.85GHz to 32GHz. The integrated spectrum with α=-0.50 (S~ν
α) is dominated by its steep spectrum shell emission (α~-0.57), although a flat 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 (∼2%) and we conclude that G11.2-0.3 is in the transient phase from free to adiabatic expansion. The central flat 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.,
1997ApJ...489L.145T). Two symmetric structures with flat 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.
Abstract Copyright:
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Journal keyword(s):
supernova remnant - magnetic field - radio continuum: ISM
Simbad objects:
5
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