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We present an orbit-based method of combining stellar and cold gas kinematicsto constrain the dark matter profile of early-type galaxies. We apply thismethod to early-type galaxy NGC 2974, using Pan-STARRS imaging and SAURONstellar kinematics to model the stellar orbits, and introducing HI kinematicsfrom VLA observation as a tracer of the gravitational potential. Theintroduction of the cold gas kinematics shows a significant effect on theconfidence limits of especially the dark halo properties: we exclude more than$95\%$ of models within the $1-\sigma$ confidence level of Schwarzschildmodelling with only stellar kinematics, and reduce the relative uncertainty ofthe dark matter fraction significantly to $10\%$ within $5 R_\mathrm{e}$.Adopting a generalized-NFW dark matter profile, we measure a shallow cuspyinner slope of $0.6^{+0.2}_{-0.3}$ when including the cold gas kinematics inour model. We cannot constrain the inner slope with the stellar kinematicsalone.

Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics