Abstract. This paper reports the results of the analysis of the second ROSAT PSPC survey of M 31 performed in summer 1992. We compare our results with those of the first survey, already published in Supper et al. (1997). , distributed approximately equally between the bulge and disk. Within the bulge region, the luminosity of a possible diffuse component combined with faint sources below the detection threshold is (2.0 ± 0.5) × 10 38 erg s −1 . An explanation in terms of hot gaseous emission leads to a maximum total gas mass of (1.0 ± 0.3) × 10 6 M .

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