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We derived constraints on parameters of a radiatively decaying warm darkmatter particle, e.g., the mass and mixing angle for a sterile neutrino, usingChandra X-ray spectra of a galaxy cluster 1E0657-56 (the ``bullet'' cluster).The constraints are based on nondetection of the sterile neutrino decayemission line. This cluster exhibits spatial separation between the hotintergalactic gas and the dark matter, helping to disentangle their X-raysignals. It also has a very long X-ray observation and a total mass measuredvia gravitational lensing. This makes the resulting constraints on sterileneutrino complementary to earlier results that used different cluster massestimates. Our limits are comparable to the best existing constraints.Comment: 6p

Constraints on Parameters of Radiatively Decaying Dark Matter from the Galaxy Cluster 1E 0657−56