Merging of low-mass systems and the origin of the Fundamental Plane

Evstigneeva, E. A., de Carvalho, R. R., Ribeiro, A. L. and Capelato, H. V. (2004) Merging of low-mass systems and the origin of the Fundamental Plane. Monthly Notices of The Royal Astronomical Society, 349 3: 1052-1058. doi:10.1111/j.1365-2966.2004.07583.x

Author Evstigneeva, E. A.
de Carvalho, R. R.
Ribeiro, A. L.
Capelato, H. V.
Title Merging of low-mass systems and the origin of the Fundamental Plane
Journal name Monthly Notices of The Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2004
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2004.07583.x
Open Access Status DOI
Volume 349
Issue 3
Start page 1052
End page 1058
Total pages 7
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2004
Language eng
Abstract We present a new set of dissipationless N-body simulations to examine the feasibility of creating bright ellipticals (following the Kormendy relation, hereafter KR) by hierarchically merging present-day early-type dwarf galaxies, and to study how the encounter parameters affect the location of the end product in the (mu(e))-R-e plane. We investigate the merging of one-component galaxies of both equal and different masses, the merging of two-component galaxy models to explore the effect of dark haloes on the final galaxy characteristics, and the merging of ultracompact dwarf galaxies. We find that the increase of (mu(e)) with R-e is attributable to an increase in the initial orbital energy. The merger remnants shift down in the (mu(e))-R-e plane and fail to reach the KR. Thus, the KR is not reproducible by mergers of dwarf early-type systems, rendering untenable the theory that present-day dwarfs are responsible for even a small fraction of the present-day ellipticals, unless a considerable amount of dissipation is invoked. However, we do find that present-day dwarfs can be formed by the merger of ultracompact dwarfs.
Keyword Astronomy & Astrophysics
Ultracompact Dwarf Galaxies
Elliptic Galaxies
Spheroidal Galaxies
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 04:32:31 EST