Axisymmetric dynamical models for SAURON and OASIS observations of NGC 3377

¹ Institut de Physique Nucléaire de Lyon, 69222 Villeurbanne, France
² Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
³ European Southern Observatory, Karl-Schwarzschild Strasse 2, 85748 Garching bei München, Germany
⁴ Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
⁵ CRAL-Observatoire, 9 Avenue Charles-André, 69230 Saint-Genis-Laval, France

Corresponding author: Y. Copin, y.copin@ipnl.in2p3.fr

Received: 15 July 2003
Accepted: 1 November 2003

Abstract

We present a unique set of nested stellar kinematical maps of NGC 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 (99.7% confidence level), with a best-fit stellar mass-to-light ratio (for an assumed edge-on inclination).