Astronomy and Astrophysics, volume 451, 251-257 (2006/5-3)
Radio observations and spectrum of the SNR G127.1+0.5 and its central source 0125+628.
LEAHY D. and TIAN W.
Abstract (from CDS):
We present new images of the Supernova Remnant (SNR) G127.1+0.5 (R5), based on the 408MHz and 1420MHz continuum emission and the HI-line emission data of the Canadian Galactic Plane Survey (CGPS). The radio spectrum of the central compact source (0125+628) is analyzed in the range 178MHz-8.7GHz, indicating a flat spectrum with synchrotron self-absorption below 800MHz. The SNR's flux density at 408MHz is 17.1±1.7Jy and at 1420MHz is 10.0±0.8Jy, corrected for flux densities from compact sources within the SNR. The SNR's integrated flux density based spectral index (Sν∝ν–α) is 0.43±0.10. The respective T-T plot spectral index (derived from the relative size of brightness temperature variations between two frequencies, see text for details) is 0.46±0.01. There is no evidence at 1σ for spatial variations in spectral index within G127.1+0.5. In particular, we compared the northern shell, southern shell and central diffuse region. HI observations show structures associated with the SNR in the radial velocity range of -12 to -16km/s, suggesting G127.1+0.5's distance is 1.15kpc. The estimated Sedov age is 2-3x104yr.