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We perform a detailed study of the stacked Suzaku observations of 47 galaxyclusters, spanning a redshift range of 0.01-0.45, to search for theunidentified 3.5 keV line. This sample provides an independent test for thepreviously detected line. We detect only a 2sigma-significant spectral featureat 3.5 keV in the spectrum of the full sample. When the sample is divided intotwo subsamples (cool-core and non-cool core clusters), cool-core subsampleshows no statistically significant positive residuals at the line energy. Avery weak (2sigma-confidence) spectral feature at 3.5 keV is permitted by thedata from the non-cool core clusters sample. The upper limit on a neutrinodecay mixing angle from the full Suzaku sample is consistent with the previousdetections in the stacked XMM-Newton sample of galaxy clusters (which had ahigher statistical sensitivity to faint lines), M31, and Galactic Center at a90% confidence level. However, the constraint from the present sample, whichdoes not include the Perseus cluster, is in tension with previously reportedline flux observed in the core of the Perseus cluster with XMM-Newton andSuzaku.

Searching for the 3.5 keV Line in the Stacked Suzaku Observations of Galaxy Clusters