V. Gonzalez-Perez
Massive, red galaxies in a hierarchical universe – I. Counts of extremely red objects and basic properties
Gonzalez-Perez, V.; Baugh, C.M.; Lacey, C.G.; Almeida, C.
Authors
Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor
Professor Cedric Lacey cedric.lacey@durham.ac.uk
Professor
C. Almeida
Abstract
We present predictions for the abundance and nature of extremely red objects (EROs) in the Λ cold dark matter model. EROs are red, massive galaxies observed at z≥ 1 and their numbers and properties pose a challenge to hierarchical galaxy formation models. We compare the predictions from two published models, one of which invokes a ‘superwind’ to regulate star formation in massive haloes and the other which suppresses gas cooling in haloes through ‘radio-mode’ active galactic nucleus (AGN) feedback. The superwind model underestimates the number counts of EROs by an order of magnitude, whereas the radio-mode AGN feedback model gives excellent agreement with the number counts and redshift distribution of EROs. In the AGN feedback model the ERO population is dominated by old, passively evolving galaxies, whereas observations favour an equal split between old galaxies and dusty starbursts. Also, the model predicts a more extended redshift distribution of passive galaxies than is observed. These comparisons suggest that star formation may be quenched too efficiently in this model.
Citation
Gonzalez-Perez, V., Baugh, C., Lacey, C., & Almeida, C. (2009). Massive, red galaxies in a hierarchical universe – I. Counts of extremely red objects and basic properties. Monthly Notices of the Royal Astronomical Society, 398(2), 497-514. https://doi.org/10.1111/j.1365-2966.2009.14397.x
Journal Article Type | Article |
---|---|
Publication Date | Sep 11, 2009 |
Deposit Date | Jan 31, 2012 |
Publicly Available Date | Mar 29, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 398 |
Issue | 2 |
Pages | 497-514 |
DOI | https://doi.org/10.1111/j.1365-2966.2009.14397.x |
Keywords | Galaxies: evolution, Galaxies: formation, Galaxies: high-redshift, Cosmology: theory. |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
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