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NGC1300 dynamics - II. The response models
Kalapotharakos, C.; Patsis, P. A.; Grosbøl, P.
AA(Research Centre for Astronomy, Academy of Athens, Soranou Efessiou 4, GR-115 27 Athens, Greece), AB(Research Centre for Astronomy, Academy of Athens, Soranou Efessiou 4, GR-115 27 Athens, Greece; Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France; European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany), AC(European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany)
Monthly Notices of the Royal Astronomical Society, Volume 408, Issue 1, pp. 9-21. (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
ISM: kinematics and dynamics, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure
Abstract Copyright:
(c) Journal compilation © 2010 RAS
Bibliographic Code:


We study the stellar response in a spectrum of potentials describing the barred spiral galaxy NGC1300. These potentials have been presented in a previous paper and correspond to three different assumptions as regards the geometry of the galaxy. For each potential we consider a wide range of Omegap pattern speed values. Our goal is to discover the geometries and the Omegap supporting specific morphological features of NGC1300. For this purpose we use the method of response models. In order to compare the images of NGC1300 with the density maps of our models, we define a new index which is a generalization of the Hausdorff distance. This index helps us to find out quantitatively which cases reproduce specific features of NGC1300 in an objective way. Furthermore, we construct alternative models following a Schwarzschild-type technique. By this method we vary the weights of the various energy levels, and thus the orbital contribution of each energy, in order to minimize the differences between the response density and that deduced from the surface density of the galaxy, under certain assumptions. We find that the models corresponding to Omegap ~ 16 and 22 kms-1kpc-1 are able to reproduce efficiently certain morphological features of NGC1300, with each one having its advantages and drawbacks.

Based on observations collected at the European Southern Observatory, Chile: programme ESO 69.A-0021.

E-mail: (CK); (PAP); (PG)

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