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Cosmic CARNage II: the evolution of the galaxy stellar mass function in observations and galaxy formation models

Asquith, Rachel; Pearce, Frazer R.; Almaini, Omar; Knebe, Alexander; Gonzalez-Perez, Violeta; Benson, Andrew; Blaizot, Jeremy; Carretero, Jorge; Castander, Francisco J.; Cattaneo, Andrea; Cora, Sofía A.; Croton, Darren J.; Devriendt, Julien E.; Fontanot, Fabio; Gargiulo, Ignacio D.; Hartley, Will; Henriques, Bruno; Lee, Jaehyun; Mamon, Gary A.; Onions, Julian; Padilla, Nelson D.; Power, Chris; Srisawat, Chaichalit; Stevens, Adam R.H.; Thomas, Peter A.; Vega-Martínez, Cristian A.; Yi, Sukyoung K.

Authors

Rachel Asquith rachel.asquith@nottingham.ac.uk

Frazer R. Pearce

Omar Almaini

Alexander Knebe

Violeta Gonzalez-Perez

Andrew Benson

Jeremy Blaizot

Jorge Carretero

Francisco J. Castander

Andrea Cattaneo

Sofía A. Cora

Darren J. Croton

Julien E. Devriendt

Fabio Fontanot

Ignacio D. Gargiulo

Will Hartley

Bruno Henriques

Jaehyun Lee

Gary A. Mamon

Julian Onions julian.onions@nottingham.ac.uk

Nelson D. Padilla

Chris Power

Chaichalit Srisawat

Adam R.H. Stevens

Peter A. Thomas

Cristian A. Vega-Martínez

Sukyoung K. Yi



Abstract

We present a comparison of the observed evolving galaxy stellar mass functions with the predictions of eight semi-analytic models and one halo occupation distribution model. While most models are able to fit the data at low redshift, some of them struggle to simultaneously fit observations at high redshift. We separate the galaxies into ‘passive’ and ‘star-forming’ classes and find that several of the models produce too many low-mass star-forming galaxies at high redshift compared to observations, in some cases by nearly a factor of 10 in the redshift range 2.5 < z < 3.0. We also find important differences in the implied mass of the dark matter haloes the galaxies inhabit, by comparing with halo masses inferred from observations. Galaxies at high redshift in the models are in lower mass haloes than suggested by observations, and the star formation efficiency in low-mass haloes is higher than observed. We conclude that many of the models require a physical prescription that acts to dissociate the growth of low-mass galaxies from the growth of their dark matter haloes at high redshift.

Journal Article Type Article
Publication Date Oct 11, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 0035-8711
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 480
Issue 1
Pages 1197–1210
APA6 Citation Asquith, R., Pearce, F. R., Almaini, O., Knebe, A., Gonzalez-Perez, V., Benson, A., …Yi, S. K. (2018). Cosmic CARNage II: the evolution of the galaxy stellar mass function in observations and galaxy formation models. Monthly Notices of the Royal Astronomical Society, 480(1), (1197–1210). doi:10.1093/mnras/sty1870. ISSN 0035-8711
DOI https://doi.org/10.1093/mnras/sty1870
Keywords methods:numerical, galaxies:haloes, galaxies: evolution, cosmology:theory, dark matter
Publisher URL https://academic.oup.com/mnras/article/480/1/1197/5054051
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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