If the universe consisted of domains of matter and antimatter,annihilations of e^(+)-e^(-) at the domain interface in the recombination time would leave an imprint on the x-ray band due to the high redshift.We found five ROSAT sources with the 0.36keV spectral line,especially the source lRXP J005510-3738.8 has a single sharp spectral line almost without a continuous spectrum.It is hard to be produced by any mechanism except the annihilations of e^(+)-e^(-).
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