Formation of Elliptical and S0 Galaxies by Close Encounters

Details Formation of Elliptical and S0 Galaxies by Close Encounters Formation of Elliptical and S0 Galaxies by Close Encounters

1999-07-29

arxiv.org/abs/astro-ph/9907417v1

Astronomy and Astrophysics

Astrophysics

4 Latex pages, 2 Postscript figures, uses paspconf.sty. To appear in ASP Conference Series, Vol. 182, Galaxy Dynamics, ed. D.M

Scientific paper

We study a possible formation mechanism for elliptical/S0 galaxies using N-body simulations with GRAPE. A close galaxy encounter which does not lead to a merger can induce a strong bar in an initially axisymmetric disk. This bar is unstable against bending oscillations and loses angular momentum to the dark halo. After 6 Gyrs the remnant is spheroidal with a de Vaucouleurs-type surface profile and has ellipticities and rotation properties comparable to observed elliptical/S0 galaxies: the system rotates fast (v/sigma \approx 1) and has disky isophotes.

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