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We report on the discovery of two supernova remnants (SNRs) designatedG152.4-2.1 and G190.9-2.2, using Canadian Galactic Plane Survey data. The aimsof this paper are, first, to present evidence that favours the classificationof both sources as SNRs, and, second, to describe basic parameters (integratedflux density, spectrum, and polarization) as well as properties (morphology,line-of-sight velocity, distance and physical size) to facilitate and motivatefuture observations. Spectral and polarization parameters are derived frommultiwavelength data from existing radio surveys carried out at wavelengthsbetween 6 and 92cm. In particular for the source G152.4-2.1 we also use newobservations at 11cm done with the Effelsberg 100m telescope. The interstellarmedium around the discovered sources is analyzed using 1-arcminute line datafrom neutral hydrogen (HI) and 45-arcsecond 12CO(J=1-0). G152.4-2.1 is a barrelshaped SNR with two opposed radio-bright polarized flanks on the North andSouth. The remnant, which is elongated along the Galactic plane is evolving ina more-or-less uniform medium. G190.9-2.2 is also a shell-type remnant withEast and West halves elongated perpendicular to the plane, and is evolvingwithin a low-density region bounded by dense neutral hydrogen in the North andSouth, and molecular (12CO) clouds in the East and West. The integrated radiocontinuum spectral indices are -0.65+/-0.05 and -0.66+/-0.05 for G152.4-2.1 andG190.9-2.2 respectively. Both SNRs are approximately 1 kpc distant, withG152.4-2.1 being larger (32x30 pc in diameter) than G190.9-2.2 (18x16 pc).These two remnants are the lowest surface brightness SNRs yet catalogued at5x10^-23 W m^-2 Hz^-1 sr^-1.

Two Radio Supernova Remnants Discovered in the Outer Galaxy