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We study the prospects for studying line features in gamma-ray spectra withupcoming gamma-ray experiments, such as HESS-II, the Cherenkov Telescope Array(CTA), and the GAMMA-400 satellite. As an example we use the narrow feature at130 GeV seen in public data from the Fermi-LAT satellite. We found that allthree experiments should be able to confidently confirm or rule out thepresence of this 130 GeV feature. If it is real, it should be confirmed with aconfidence level higher than 5 sigma. Assuming it to be a spectral signature ofdark matter origin, GAMMA-400, thanks to a projected energy resolution of about1.5% at 100 GeV, should also be able to resolve both the \gamma\gamma-line anda corresponding Z\gamma- or H\gamma-feature, if the corresponding branchingratio is comparable to that into two photons. It will also allow to distinguishbetween a gamma-ray line and the similar feature resulting from internalbremsstrahlung photons.

Investigating Gamma-Ray Lines from Dark Matter with Future Observatories