Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..343a&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
Strong central concentrations in general and black holes in particular have been found in some previous simulations to be incompatible with the robustness of strong bars. Similarly ellipsoids that harbour them tend to become axisymmetric first and then near-circular. Yet both strong central concentrations and black holes are very common in the central parts of galaxies while over two third of disc galaxies are barred. Thus such results if confirmed would have far reaching implications on galaxy evolution and would necessitate bar regeneration mechanisms to conciliate theory and observations.
We test the effect of a black hole on the dynamics of a bar using very high resolution N-body simulations in which we grow a central mass concentration in the center of a disc galaxy. We explore different masses and different central concentrations to find the limits beyond which the bar may not survive. We then compare with the known data on black hole masses and also with the data of other central mass concentrations (e.g. central CO). We discuss the rate at which the strength of the bar can decrease.
Athanassoula Evangelia
Dehnen Walter
Lambert Jean-Charles
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