Low-mass galaxy assembly in simulations: Regulation of early star formation by radiation from massive stars
Entity
UAM. Departamento de Física TeóricaPublisher
Oxford University Press on behalf of the Royal Astronomical SocietyDate
2015-01-11Citation
10.1093/mnras/stu2037
Monthly Notices of Royal Astronomical Society 446.2 (2015): 1140-1162
ISSN
0035-8711 (print); 1365-2966 (online)DOI
10.1093/mnras/stu2037Editor's Version
http://dx.doi.org/10.1093/mnras/stu2037Subjects
Cosmology: theory; Dark matter; Galaxies: formation; Galaxies: evolution; Galaxies: dwarfs; Galaxies: haloes; Stars: formation; FísicaNote
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reservedRights
© 2015 The Authors: Published by Oxford University Press on behalf of the Royal Astronomical SocietyAbstract
One major problem of current theoretical models of galaxy formation is given by their inability to reproduce the apparently 'anti-hierarchical' evolution of galaxy assembly: massive galaxies appear to be in place since z ~ 3, while a significant increase of the number densities of low-mass galaxies is measured with decreasing redshift. In this work, we perform a systematic analysis of the influence of different stellar feedback schemes, carried out in the framework of gaea, a new semi-analytic model of galaxy formation. It includes a self-consistent treatment for the timings of gas, metal and energy recycling, and for the chemical yields. We show this to be crucial to use observational measurements of the metallicity as independent and powerful constraints for the adopted feedback schemes. The observed trends can be reproduced in the framework of either a strong ejective or preventive feedback model. In the former case, the gas ejection rate must decrease significantly with cosmic time (as suggested by parametrizations of the cosmological 'FIRE' simulations). Irrespective of the feedback scheme used, our successful models always imply that up to 60-70 per cent of the baryons reside in an 'ejected' reservoir and are unavailable for cooling at high redshift. The same schemes predict physical properties of model galaxies (e.g. gas content, colour, age, and metallicity) that are in much better agreement with observational data than our fiducial model. The overall fraction of passive galaxies is found to be primarily determined by internal physical processes, with environment playing a secondary role.
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Google Scholar:Trujillo-Gómez, S.
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Klypin, A.
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Colín, P.
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Ceverino Rodríguez, Daniel
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Arraki, K.
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Primack, J.
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