Identification and confirmation of NGC 3344 SNRs

Using high spectral and spatial resolution data, obtained with the CFHT imaging Fourier transform spectrograph SITELLE, we identified about 2200 emission line regions, many of which are HII regions, diffuse ionized gas regions, and also SNRs. Considering the stellar population and diffuse ionized gas background, which are quite important in NGC 3344, we have selected 129 SNR candidates based on four criteria for regions where the emission lines flux ratio [SII]/H{alpha}>=0.4.

Emission lines of [OII]{lambda}3727, H{beta}, [OIII]{lambda}{lambda}4959,5007, H{alpha}, [NII]{lambda}{lambda}6548,6583, and [SII]{lambda}{lambda}6716,6731 have been measured to study the ionized gas properties of the SNR candidates. We adopted a self-consistent spectroscopic analysis, based on Sabbadin plots and Baldwin, Phillips & Terlevich diagrams, to confirm the shock-heated nature of the ionization mechanism in the candidates sample.