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We present the results from ASCA observations of the centrally enhancedsupernova remnant 3C 391 (G31.9+0.0). We use the ASCA SIS data to carry out aninvestigation of the spatial and spectral properties of the X-ray emission fromthis remnant. The collisional equilibrium ionization and non-equilibriumionization spectral fits indicate that the hot gas within the remnant hasbasically reached ionization equilibrium. The variation of the hydrogen columndensity across the remnant is in agreement with the presence of a molecularcloud to the northwest. The comparisons of hydrogen column and X-ray hardnessbetween the NW and SE portions of the remnant support a scenario in which theSNR has broken out of a dense region into an adjacent region of lower density.The mean density within the SNR is observed to be much lower than the immediateambient cloud density. This and the centrally brightened X-ray morphology canbe explained either by the evaporation of engulfed cloudlets or by a radiativestage of evolution for the remnant.Comment: 23 pages, 3 figures, accepted for the v563 ApJ 12/10/01 issu

ASCAObservations of the Thermal Composite Supernova Remnant 3C 391