2001A&A...372..627K


Query : 2001A&A...372..627K

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~να) 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:

Journal keyword(s): supernova remnant - magnetic field - radio continuum: ISM

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1137 1
2 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1275 1
3 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           ~ 757 4
4 SNR G011.2-00.3 SNR 18 11 28.9 -19 25 29           ~ 270 1
5 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2621 1

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2022.08.16-00:39:28

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