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The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers

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The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers. / Thomas, J.; Jesseit, R.; Saglia, R.; Bender, R.; Burkert, A.; Corsini, E.; Gebhardt, K.; Magorrian, J.; Naab, T.; Thomas, Daniel; Wegner, G.

In: Monthly Notices of the Royal Astronomical Society, Vol. 393, No. 2, 2009, p. 641-652.

Research output: Contribution to journalArticle

Harvard

Thomas, J, Jesseit, R, Saglia, R, Bender, R, Burkert, A, Corsini, E, Gebhardt, K, Magorrian, J, Naab, T, Thomas, D & Wegner, G 2009, 'The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers', Monthly Notices of the Royal Astronomical Society, vol. 393, no. 2, pp. 641-652. https://doi.org/10.1111/j.1365-2966.2008.14238.x

APA

Thomas, J., Jesseit, R., Saglia, R., Bender, R., Burkert, A., Corsini, E., ... Wegner, G. (2009). The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers. Monthly Notices of the Royal Astronomical Society, 393(2), 641-652. https://doi.org/10.1111/j.1365-2966.2008.14238.x

Vancouver

Thomas J, Jesseit R, Saglia R, Bender R, Burkert A, Corsini E et al. The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers. Monthly Notices of the Royal Astronomical Society. 2009;393(2):641-652. https://doi.org/10.1111/j.1365-2966.2008.14238.x

Author

Thomas, J. ; Jesseit, R. ; Saglia, R. ; Bender, R. ; Burkert, A. ; Corsini, E. ; Gebhardt, K. ; Magorrian, J. ; Naab, T. ; Thomas, Daniel ; Wegner, G. / The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 393, No. 2. pp. 641-652.

Bibtex

@article{c86e58a667844c01837a61555e51ba92,
title = "The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers",
abstract = "We use oblate axisymmetric dynamical models including dark haloes to determine the orbital structure of intermediate mass to massive early-type galaxies in the Coma galaxy cluster. We find a large variety of orbital compositions. Averaged over all sample galaxies the unordered stellar kinetic energy in the azimuthal and the radial direction are of the same order, but they can differ by up to 40 per cent in individual systems. In contrast, both for rotating and non-rotating galaxies the vertical kinetic energy is on average smaller than in the other two directions. This implies that even most of the rotating ellipticals are flattened by an anisotropy in the stellar velocity dispersions. Using three-integral axisymmetric toy models, we show that flattening by stellar anisotropy maximizes the entropy for a given density distribution. Collisionless disc merger remnants are radially anisotropic. The apparent lack of strong radial anisotropy in observed early-type galaxies implies that they may not have formed from mergers of discs unless the influence of dissipational processes was significant.",
author = "J. Thomas and R. Jesseit and R. Saglia and R. Bender and A. Burkert and E. Corsini and K. Gebhardt and J. Magorrian and T. Naab and Daniel Thomas and G. Wegner",
note = "Copyright 2009 The Authors. Journal compilation Copyright 2009 RAS,",
year = "2009",
doi = "10.1111/j.1365-2966.2008.14238.x",
language = "English",
volume = "393",
pages = "641--652",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

RIS

TY - JOUR

T1 - The flattening and the orbital structure of early-type galaxies and collisionless N-body binary disc mergers

AU - Thomas, J.

AU - Jesseit, R.

AU - Saglia, R.

AU - Bender, R.

AU - Burkert, A.

AU - Corsini, E.

AU - Gebhardt, K.

AU - Magorrian, J.

AU - Naab, T.

AU - Thomas, Daniel

AU - Wegner, G.

N1 - Copyright 2009 The Authors. Journal compilation Copyright 2009 RAS,

PY - 2009

Y1 - 2009

N2 - We use oblate axisymmetric dynamical models including dark haloes to determine the orbital structure of intermediate mass to massive early-type galaxies in the Coma galaxy cluster. We find a large variety of orbital compositions. Averaged over all sample galaxies the unordered stellar kinetic energy in the azimuthal and the radial direction are of the same order, but they can differ by up to 40 per cent in individual systems. In contrast, both for rotating and non-rotating galaxies the vertical kinetic energy is on average smaller than in the other two directions. This implies that even most of the rotating ellipticals are flattened by an anisotropy in the stellar velocity dispersions. Using three-integral axisymmetric toy models, we show that flattening by stellar anisotropy maximizes the entropy for a given density distribution. Collisionless disc merger remnants are radially anisotropic. The apparent lack of strong radial anisotropy in observed early-type galaxies implies that they may not have formed from mergers of discs unless the influence of dissipational processes was significant.

AB - We use oblate axisymmetric dynamical models including dark haloes to determine the orbital structure of intermediate mass to massive early-type galaxies in the Coma galaxy cluster. We find a large variety of orbital compositions. Averaged over all sample galaxies the unordered stellar kinetic energy in the azimuthal and the radial direction are of the same order, but they can differ by up to 40 per cent in individual systems. In contrast, both for rotating and non-rotating galaxies the vertical kinetic energy is on average smaller than in the other two directions. This implies that even most of the rotating ellipticals are flattened by an anisotropy in the stellar velocity dispersions. Using three-integral axisymmetric toy models, we show that flattening by stellar anisotropy maximizes the entropy for a given density distribution. Collisionless disc merger remnants are radially anisotropic. The apparent lack of strong radial anisotropy in observed early-type galaxies implies that they may not have formed from mergers of discs unless the influence of dissipational processes was significant.

U2 - 10.1111/j.1365-2966.2008.14238.x

DO - 10.1111/j.1365-2966.2008.14238.x

M3 - Article

VL - 393

SP - 641

EP - 652

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 2

ER -

ID: 67516