A limit on the dark matter and baryons interaction cross-section in galaxy clusters

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  • 10 August 2004
Abstract
We re-examine the consequences of collisional energy exchange between the baryonic and the dark matter in the cores of galaxy clusters and derive a new upper limit on the cross section. If the dark matter particle mass m_x is greater than the proton mass m_p, then consistency with the observed temperature profiles in clusters constrains the cross section to be sigma_{xp}<10^{-25} cm^2 (m_x/m_p). For m_x/m_p~0.2-0.3 the dark matter-baryon interaction may, however, explain the absence of cooling flows.

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