Journal Article

The origin of the Hubble sequence in ΛCDM cosmology

Andrew J. Benson and Nick Devereux

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 4, pages 2321-2334
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16089.x
The origin of the Hubble sequence in ΛCDM cosmology

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The galform semi-analytic model of galaxy formation is used to explore the mechanisms primarily responsible for the three types of galaxies seen in the local universe: bulge, bulge+disc and disc, identified with the visual morphological types E, S0/a-Sbc and Sc-Scd, respectively. With a suitable choice of parameters the galform model can accurately reproduce the observed local Ks-band luminosity function (LF) for galaxies split by visual morphological type. The successful set of model parameters is used to populate the Millennium Simulation with 9.4 million galaxies and their dark matter haloes. The resulting catalogue is then used to explore the evolution of galaxies through cosmic history. The model predictions concur with recent observational results including the galaxy merger rate, the star formation rate and the seemingly antihierarchical evolution of ellipticals. However, the model also predicts significant evolution of the elliptical galaxy LF that is not observed. The discrepancy raises the possibility that samples of z∼ 1 galaxies which have been selected using colour and morphological criteria may be contaminated with galaxies that are not actually ellipticals.

Keywords: galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: formation; galaxies: luminosity function, mass function; galaxies: spiral; galaxies: structure

Journal Article.  8999 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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