Discovery of a new faint radio SNR G108.2-0.6

A new faint and large shell-type radio Supernova Remnant (SNR) G108.2-0.6 has been discovered in the Canadian Galactic Plane Survey (CGPS). The SNR shows an elliptical shell-type structure at 1420 MHz, and has a 408-1420 MHz TT-plot spectral index of alpha = -0.5 +/- 0.1 (S-v proportional to v(alpha)), typical of a shell-type SNR. The remnant's flux density at 1420 MHz is 6.6 +/- 0.7 Jy, and at 408 MHz is 11.5 +/- 1.2 Jy. Both of these are corrected for compact sources. An integrated spectral index of -0.45 +/- 0.13 is determined. This new SNR has among the lowest surface brightness of any known remnants (Sigma(1 GHz) = 2.4 x 10(-22) W m(-2) Hz(-1) sr(-1)). 21 cm Stokes Q and U CGPS data (plus preliminary Effelsberg Q and U maps) show some suggestive features that correlate with total power. HI observations show structures associated with G108.2-0.6 in the radial velocity range -53 to -58 km s(-1), and indicate it is located in the Perseus arm shock at a distance of 3.2 +/- 0.6 kpc. At this distance the diameter of G108.2-0.6 is 58 pc. IRAS maps (12, 25, 60 and 100 mu m) of the new SNR show rich infrared emission surrounding G108.2-0.6.