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We assess Galactic Dark Matter (DM) sensitivities to photons fromannihilation and decay using the spatial and kinematic information determinedby state-of-the-art simulations in the Latte suite of Feedback In RealisticEnvironments (FIRE-2). For kinematic information, we study the energy shiftpattern of DM narrow emission lines predicted in FIRE-2 and discuss itspotential as DM-signal diagnosis, showing for the first time the power ofsymmetric observations around $l=0^{\circ}$. We find that the exposures neededto resolve the line separation of DM to gas by XRISM at $5\sigma$ to be large,$\gtrsim 4$ Ms, while exposures are smaller for Athena ($\lesssim 50$ ks) andLynx ($\lesssim 100$ ks). We find that large field-of-view exposures remain themost sensitive methods for detection of DM annihilation or decay by theluminosity of signals in the field of view dominating velocity information. The$\sim$4 sr view of the Galactic Center region by the Wide Field Monitor (WFM)aboard the eXTP mission will be highly sensitive to DM signals, with a prospectof $\sim 10^5$ to $10^6$ events from the 3.5 keV line in a 100 ks exposure,with the range dependent on photon acceptance in WFM's field of view. We alsoinvestigate detailed all-sky luminosity maps for both DM annihilation and decaysignals - evaluating the signal-to-noise for a DM detection with realisticX-ray and gamma-ray backgrounds - as a guideline for what could be aforthcoming era of DM astronomy.

Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands