G106.3+2.7: A supernova remnant in a late stage of evolution

We report on observations of the candidate supernova remnant (SNR) G106.3 2.7 with the Dominion Radio Astrophysical Observatory's Synthesis Telescope in the continuum at both 408 and 1420 MHz and in the 21 cm line of neutral hydrogen. The general morphology of the object and its spectral index (alp ha approximate to 0.57 +/- 0.04, where S-nu proportional to nu (-alpha)) co nfirm it as an SNR. The object consists of two distinct components, the hea d and the tail. The tail component is of lower surface brightness and has a marginally steeper spectral index than the head component. A deficiency of neutral hydrogen at an LSR velocity of about -105 km s(-1) is most likely due to the effect of the SNR, suggesting that the SNR is expanding at a vel ocity of about 15 km s(-1), it is at a kinematic distance of 12 kpc, and it s largest angular extent is of the order of 200 pc. These parameters are sh own to be consistent with a dynamical model in which the SNR is in a very l ate stage of its isothermal evolution, where the pressure inside the SNR is approaching the pressure of the ambient interstellar medium. We also descr ibe the H II region Sh 141, which is about 20' north of G106.3 + 2.7.