Bibcode
Kalinova, Veselina; van de Ven, G.; Lyubenova, M.; Falcón-Barroso, J.; van den Bosch, R.
Referencia bibliográfica
American Astronomical Society, AAS Meeting #221, #241.05
Fecha de publicación:
1
2013
Número de citas
1
Número de citas referidas
1
Descripción
The mass of a galaxy is the most important parameter to understand its
structure and evolution. The total mass we can infer by constructing
dynamical models that fit the motion of the stars and gas in the galaxy.
The dark matter content then follows after subtracting the luminous
matter inferred from colors and/or spectra. Here, we present the mass
distribution of a sample of 18 late-type spiral (Sb-Sd) galaxies, using
two-dimensional stellar kinematics obtained with the integral-field
spectrograph SAURON. The observed second order velocity moments of these
galaxies are fitted with solutions of the Axisymmetric Jeans equations
and give us an accurate estimation of the mass-to-light ratio profiles
and rotational curves. The rotation curves of the galaxies are obtained
by the Asymmetric Drift Correction (ADC) and Multi-Gaussian Expansion
(MGE) methods, corresponding to one- and two-dimensional mass
distribution. Their comparison shows that the mass distribution based on
the 2D stellar kinematics is much more reliable than 1D one. SAURON
integral field of view looks at the inner parts of the galaxies in
contrast with CALIFA survey. CALIFA survey provides PMAS/PPAK
integral-field spectroscopic data of ~ 600 nearby galaxies as part of
the Calar Alto Legacy Integral Field Area. We show the first CALIFA
dynamical models of different morphological type of galaxies, giving the
clue about the mass distribution of galaxies through the whole Hubble
sequence and their evolution from the blue cloud to the red sequence.