CaltechAUTHORS
  A Caltech Library Service

The nature and descendants of Lyman-break galaxies in the Λ cold dark matter cosmology

González, Juan E. and Lacey, C. G. and Baugh, C. M. and Frenk, C. S. and Benson, A. J. (2012) The nature and descendants of Lyman-break galaxies in the Λ cold dark matter cosmology. Monthly Notices of the Royal Astronomical Society, 423 (4). pp. 3709-3726. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20120807-100755260

[img]
Preview
PDF - Published Version
See Usage Policy.

2168Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20120807-100755260

Abstract

We predict the formation histories, properties and descendants of Lyman-break galaxies (LBGs) in the Λ cold dark matter cosmology. In our model, which incorporates a top-heavy initial mass function in starbursts, we find that most LBGs are starbursts triggered by minor mergers of galaxies. The duration of the LBG phase is predicted to be quite short, ∼20–60 Myr. We investigate the distributions of stellar and halo masses and morphologies for bright (L_(UV) > L^*_(UV)) and faint (L_UV > 0.1L^*_(UV)) LBGs at z= 3, 6 and 10 [where we classify LBGs according to their rest-frame ultraviolet (UV) luminosities relative the observed characteristic luminosity L^*_(UV) at z≈3]. Bright LBGs at z=3 are predicted to have median stellar masses ∼ 1 × 10^9 h^(−1) M_⊙ and host halo masses ∼ 3 × 10^(11) h^(−1) M_⊙, and be typically mildly disc dominated in stellar mass. On the other hand, faint LBGs at z=10 are predicted to have median stellar masses of only ∼ 1 × 10^7 h^(−1) M_⊙ and host halo masses ∼ 2 × 10^(10) h^(−1) M_⊙, and be generally bulge dominated. Bright LBGs at z=3 evolve to present-day galaxies with median stellar mass ∼ 5 × 10^(10) h^(−1) M_⊙ (comparable to the Milky Way), consisting of roughly equal numbers of disc- and bulge-dominated systems, and hosted by haloes with median mass ∼ 2 × 10^(13) h^(−1) M_⊙ (corresponding to medium-size galaxy groups). The model predicts that 40 per cent of Milky Way mass galaxies at the present day have a bright LBG progenitor in the redshift range 3 < z < 4, while 95 per cent have a faint LBG progenitor in the same redshift range and 7 per cent have a faint LBG progenitor at 10 < z < 11. With our multiwavelength model, we also investigate the overlap between the LBG population and that of selected submillimetre galaxies (SMGs); at z=3, only ∼ 1 per cent of bright LBGs are also predicted to be bright SMGs (with an inline imagem flux in excess of 5 mJy).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2012.21167.xDOIArticle
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2012.21167.x/abstractPublisherArticle
ORCID:
AuthorORCID
Benson, A. J.0000-0001-5501-6008
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 April 23. Received 2012 March 16; in original form 2011 May 17. We thank the referee for providing a helpful and insightful report. JEG acknowledges receipt of a fellowship funded by the European Commission’s Framework Programme 6, through the Marie Curie Early Stage Training project MEST-CT-2005-021074. This work was supported in part by the Science and Technology Facilities Council rolling grant to the ICC, and by the Austrian Science Foundation FWF under grant I164. CSF acknowledges a Royal Society Wolfson Research Grant Award. AJB acknowledges the support of the Gordon and Betty Moore Foundation.
Group:Moore Center for Theoretical Cosmology and Physics
Funders:
Funding AgencyGrant Number
European Commission Framework Programme 6UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
FWF Der WissenschaftsfondsI164
Royal SocietyUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Marie Curie FellowshipMEST-CT-2005-021074
Subject Keywords:galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: starburst; cosmology: theory
Record Number:CaltechAUTHORS:20120807-100755260
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120807-100755260
Official Citation:González, J. E., Lacey, C. G., Baugh, C. M., Frenk, C. S. and Benson, A. J. (2012), The nature and descendants of Lyman-break galaxies in the Λ cold dark matter cosmology. Monthly Notices of the Royal Astronomical Society, 423: 3709–3726. doi: 10.1111/j.1365-2966.2012.21167.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32973
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:07 Aug 2012 17:40
Last Modified:09 Nov 2016 21:31

Repository Staff Only: item control page