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The size evolution of elliptical galaxies.

Xie, L. and Guo, Q. and Cooper, A. P. and Frenk, C. S. and Li, R. and Gao, L. (2015) 'The size evolution of elliptical galaxies.', Monthly notices of the Royal Astronomical Society., 447 (1). pp. 636-645.


Recent work has suggested that the amplitude of the size–mass relation of massive early-type galaxies (ETGs) evolves with redshift. Here we use a semi-analytical galaxy formation model to study the size evolution of massive ETGs. We find this model is able to reproduce the amplitude and slope of the relation between size and stellar mass for these galaxies, as well as its evolution. The amplitude of this relation reflects the typical compactness of dark haloes at the time when most of the stars are formed. This link between size and star formation epoch is propagated in galaxy mergers. Mergers of high or moderate mass ratio (less than 1:3) become increasingly important with increasing present day stellar mass for galaxies more massive than 1011.4 M⊙. At lower masses, low mass ratio mergers play a more important role. In situ star formation contributes more to the size growth than it does to stellar mass growth. We also find that, for ETGs identified at z = 2, minor mergers dominate subsequent growth both for stellar mass and in size, consistent with earlier theoretical results.

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Publisher statement:This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:24 November 2014
Date deposited:07 April 2016
Date of first online publication:18 December 2014
Date first made open access:No date available

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