EDP Sciences
Free access
Volume 490, Number 3, November II 2008
Page(s) L43 - L47
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200810819
Published online 03 October 2008

A&A 490, L43-L47 (2008)
DOI: 10.1051/0004-6361:200810819


Merger as intermittent accretion

M. Le Delliou1, 2

1  Instituto de Física Teórica, Módulo C-XI Facultad de Ciencias Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
    e-mail: Morgan.LeDelliou@uam.es
2  Centro de Física Teórica e Computacional, Universidade de Lisboa, Av. Gama Pinto 2, 1649-003 Lisboa, Portugal
    e-mail: delliou@cii.fc.ul.pt

Received 18 August 2008 / Accepted 29 September 2008

Aims. The self-similar secondary infall model (SSIM) is modified to simulate a merger event.
Methods. The model encompasses spherical versions of tidal stripping and dynamical friction that agrees with the Syer & White merger paradigm's behaviour.
Results. The SSIM shows robustness in absorbing even comparable mass perturbations and returning to its original state.
Conclusions. It suggests that the approach is invertible and allows considering accretion as smooth mass-inflow merging and considering mergers as intermittent mass-inflow accretion.

Key words: cosmology: theory -- cosmology: dark matter -- galaxies: formation -- galaxies: halos -- gravitation

© ESO 2008