Low-mass galaxy formation and the ionizing photon budget during reionization
Low-mass galaxy formation and the ionizing photon budget during reionization
复制标题
低质量星系的形成和再电离过程中的电离光子预算
DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
G. Poole
中科院分区:
文献类型:
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作者:
A. Duffy;J. Wyithe;S. Mutch;G. Poole
ABSTRACT We use high resolution simulations of cosmological volumes to model galaxy forma-tion at high redshift, with the goal of studying the photon budget for reionisation. Wedemonstrate that galaxy formation models that include a strong, thermally coupledsupernovae scheme reproduce current observations of star formation rates and speci cstar formation rates, both during and after the reionisation era. These models produceenough UV photons to sustain reionisation at z.8 (z.6) through a signi cant popu-lation of faint, unobserved, galaxies for an assumed escape fraction of 20% (5%). Thispredicted population is consistent with extrapolation of the faint end of observed UVluminosity functions. We nd that heating from a global UV/X-ray background afterreionisation causes a dip in the total global star formation rate density in galaxiesbelow the current observational threshold. Finally, while the currently observed spe-ci c star formation rates are incapable of di erentiating between supernovae feedbackmodels, suciently deep observations will be able to use this diagnostic in the futureto investigate galaxy formation at high redshift.Key words: dark ages, reionisation, hydrodynamical simulations - galaxies: evolution- galaxies: formation
影响因子:
8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者:
Wright, E. L.
影响因子:
6.5
作者:
McCracken, H. J.;Milvang-Jensen, B.;Zabl, J.
通讯作者:
Zabl, J.