Radio observations of the X-ray supernova remnant G272.2-3.2

Details Radio observations of the X-ray supernova remnant G272.2-3.2 Radio observations of the X-ray supernova remnant G272.2-3.2

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289...97d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 1, pp. 97-104.

Astronomy and Astrophysics

Astronomy

6

Polarization, Ism: Individual: G272.2-3.2, Supernova Remnants, Radio Continuum: Ism

Scientific paper

Radio continuum observations are presented for the recently discovered X-ray supernova remnant (SNR) G272.2-3.2. Radio emission from this SNR has never before been detected. We find this remnant to have a non-thermal radio spectral index of 0.55+/-0.15 (S~lambda^alpha), and an almost circular appearance with a diameter of approximately 15 arcmin (in agreement with the X-ray size). High-resolution observations with the Australia Telescope Compact Array (ATCA) reveal the remnant to consist of a series of faint filaments and patches of emission, with a maximum surface brightness of 10 mJy beam area^-1 at 1.4 GHz, and a diffuse emisson component. This diffuse emission appears to be produced by shock-accelerated electrons. Modest spectral index variations are seen across the SNR, indicating that G272.2-3.2 contains no significant thermal or plerionic component. Optical filaments in the region appear to align well with the radio `blobs', whilst the X-ray enhancements show no correlation with the `blobs'. These correlations are consistent with a somewhat higher age for the remnant than is derived from the X-ray data; perhaps 6x10^3 yr or so. Within the sensitivity of the observations no polarized emission was detected from G272.2-3.2, which is possibly indicative of a highly twisted magnetic field.

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