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Dwarf spheroidal galaxies are excellent targets in gamma-ray searches fordark matter. We consider dark matter searches in dwarf spheroidal galaxies(dSphs) with the Cherenkov Telescope Array (CTA). The aim of this work is toreveal a quantitative and precise dependence of the accessible dark matterannihilation cross-sections on the dark matter density profiles of dSphs and onthe distance to them. In most data analyses, researchers have assumedpoint-like signals from dSphs because it is difficult to resolve the expectedemission profiles with current gamma-ray observatories. In future however, CTAwill be able to resolve the peak emission profiles in dSphs. We take severalvariations of the dark matter density profile of Draco dSph as examples andanalyze the simulated observations of with CTA. We derive the accessible regionof the dark matter annihilation cross-section with each dark matter densityprofile. The accessible region of the annihilation cross-section can differ bya factor of 10 among plausible profiles. We also examine the dependence on thedistance to the target dSphs by assuming the same profiles of dSphs atdifferent distances. Closer targets are better due to the higher J-factor,while their spatial extension significantly degrades our reach to theannihilation cross-section compared to the value expected from a simpledistance-scaling of the J-factor. Spatial extension of the source affects theprobable parameter region in energy-dependent ways. In some gamma-ray energyranges, this behaviour becomes moderately dependent on the properties of theobservation facility.

physical review. d/physical review. d.

Dependence of accessible dark matter annihilation cross-sections on the  density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope  Array