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Simulation of the Interacting Triplet M81, M82, NGC3077

Published online by Cambridge University Press:  03 August 2017

N. Brouillet ,
F. Combes  and
A. Baudry
N. Brouillet
Affiliation:
Observatoire de Bordeaux, B.P. 89, F-33270 Floirac, France Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-5300 Bonn 1, FRG
F. Combes
Affiliation:
Observatoire de Meudon, F-92190 Meudon, and Ecole Normale Supérieure, 24 rue Lhomond, F-75005 Paris, France
A. Baudry
Affiliation:
Observatoire de Bordeaux, B.P. 89, F-33270 Floirac, France

Abstract

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M81 is clearly interacting with its two neighbouring galaxies M82 and NGC3077. First we simulated the deformation of the atomic gas in the triplet, using a straightforward model (restricted to the 3-body problem), in order to determine the parameters of the trajectories for the three galaxies. The resulting external tidal features satisfactorily resemble the observed HI bridges and tails. We then used a model of cloud collisions to simulate the response of the M81 molecular content. However the 3-body model parameters are not compatible with such a model. Stronger perturbations are needed in a self-consistent gas and stars simulation to produce and amplify a spiral density wave in the inner disk of M81. Preliminary tests show that a strong wave can be amplified both in the stars and gas components, the global structure bearing some resemblance with the observations. The model parameters must now be improved in the light of the most recent observational data.

Type
X- Gas and Star Dynamics (Models and Simulations)
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 347 - 349
Copyright
Copyright © Kluwer 1991 

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