We present a unique set of nested stellar kinematical maps of NGCÂ 3377 obtained with the integral-field spectrographs OASIS and SAURON .
We then construct general axisymmetric dynamical models for this galaxy , based on the Schwarzschild numerical orbit superposition technique applied to these complementary measurements .
We show how these two datasets constrain the mass of the central massive object and the overall mass-to-light ratio of the galaxy by probing the inner and outer regions respectively .
The simultaneous use of both datasets leads us to confirm the presence of a massive black hole with a mass of M _ { \bullet } = 7 _ { -5 } ^ { +4 } 10 ^ { 7 } Â M _ { \sun } ( 99.7 % confidence level ) , with a best-fit stellar mass-to-light ratio \Upsilon _ { I } = 2.1 \pm 0.2 ( for an assumed edge-on inclination ) .