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A sufficiently long lived warm dark matter could be a source of X-raysobserved by satellite based X-ray telescopes. We consider axinos and gravitinoswith masses between 1 keV and 100 keV in supersymmetric models with smallR-parity violation. We show that axino dark matter receives significantconstraints from X-ray observations of Chandra and SPI, especially for thelower end of the allowed range of the axino decay constant $f_{a}$, while thegravitino dark matter remains unconstrained.

Constraints on axino warm dark matter from X-ray observation at the Chandra telescope and SPI