Abstract
X-ray images and spectra of 5 cataloged supernova remnants (SNRs: G12.0$-$0.1, G346.6$-$0.2, G348.5$+$0.1, G348.7$+$0.3, and G355.6$-$0.0) observed in the ASCA galactic plane survey are presented. The sizes of X-ray emission from G12.0$-$0.1, G348.5$+$0.1, G348.7$+$0.3, and G355.6$-$0.0 are comparable to their radio structures, while that of G346.6$-$0.2 is smaller. The X-ray spectra of all the SNRs were heavily absorbed by interstellar matter with $N_{\rm H}/gt10^{22}$cm$^{-2}$. The spectrum of G355.6$-$0.0 exhibited emission lines, indicating that the X-ray emission has a thin thermal plasma origin, and was well represented by a two-temperature thin thermal emission model. On the other hand, no clear emission-line features were found in the spectra of the others, and the spectra could be represented by either a thin thermal emission model or a power-law model.
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