Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..331v&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Physics
Scientific paper
We have developed an orbit-based method for constructing triaxial models of elliptical galaxies, which fit their observed surface brightness and kinematics. We have tested the method against analytical models with general distribution functions. Here, we present models of M32 and NGC4365. The is used to construct triaxial models of elliptical galaxies, based on an extension of the Schwarzschild orbit superposition method. The models fit the observed surface brightness and (two-dimensional) stellar kinematics. The mass distribution and gravitational potential are three-dimensional and point-symmetric and hence include spherical, axisymmetric or triaxial geometries Extensive tests on axisymmetric and triaxial analytical models show that our method is able to recover general three-integral distribution functions We present models of M32 and NGC4365 constructed using both 2D kinematics and imaging. M32 is a nearby axisymmetric elliptical galaxy and NGC4365 is an triaxial elliptical galaxy with a kinematically decoupled core of which the rotation axis is misaligned with respect to that of the main body of the galaxy. The models presented are the first two of a larger sample. They are based on combined Hubble Space Telescope and ground-based imaging and stellar kinematics from the SAURON survey obtained with the integral-field spectrograph SAURON. The models will be used to study intrinsic shape, internal structure, anisotropy, Mass-to-Light ratio (M/L). Such triaxial Schwarzschild models are essential to study the dynamical M/L, super massive black holes, intrinsic shapes, internal dynamical structure and anisotropy of giant elliptical galaxies.
Cappellari Michele
de Zeeuw Tim P.
van de Ven Glenn
van den Bosch Remco C. E.
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