A radiocontinuum study of the supernova remnant MSH 11-61A

Abstract

We present a high-resolution radio-continuum study of Galactic supernova remnant MSH11-61A. We combine moderate resolution X-ray, radio-continuum and CO data to study the morphology and kinematics of MSH 11-61A. We estimate the radio-continuum spectral index to be α843−4850=- 0.33±0.07 based on our flux density measurements and also note that this SNR has significant 'turn­over' spectra at lower (29.9843 MHz) frequencies. The diameter of MSH1161A is estimated to be 12.5' with 'ear' extensions of 41 to the northwest and southeast. The striking anticorrelation between X-ray and radio-continuum images confirms a mixed-morphology classification of this remnant. The CO images are consistent with a distance reported by Rosado et al.(1996) of about 7 kpc. .

Keywords

• ISM: individual objects: (MSH 1161A
• G290.10.8)
• ISM: supernova remnants
• radio continuum: ISM