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NGC 4608 and NGC 5701: Barred Galaxies without Disks?

By SpaceRef Editor
January 7, 2003
Filed under , ,

Astrophysics, abstract
astro-ph/0301072


From: Dimitri Alexei Gadotti <[email protected]>
Date: Mon, 6 Jan 2003 12:38:33 GMT (558kb)

NGC 4608 and NGC 5701: Barred Galaxies without Disks?


Authors:
D. A. Gadotti (1),
R. E. de Souza (1) ((1) Astronomy Department – University of Sao Paulo)

Comments: 6 pages, 5 figures; accepted for publication in The Astrophysical
Journal Letters


We have performed for the first time in the literature a 2D structural
analysis on the barred lenticular and face–on galaxies NGC 4608 and NGC 5701.
The results indicate that these galaxies either have never had large disks or
their disks were almost completely destroyed by their strong bars, due to
secular evolution processes. We discuss these surprising conclusions checking
for signs of secular evolution, considering bar forming instabilities, and
suggesting, based on N-body simulations, a new mechanism to form bars in
spheroids, which includes non-spherical halos. Quantitative predictions from
our new mechanism are compared with those from other recent models for bar
formation and evolution.

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