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26 April 2024 |
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Article overview
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Constraints on the Star Formation Efficiency of Galaxies During the Epoch of Reionization | | Guochao Sun
; Steven R. Furlanetto
; | | Date: |
19 Dec 2015 | | Abstract: | Reionization is thought to have occurred in the redshift range of $6 < z <
9$, which is now being probed by both deep galaxy surveys and CMB observations.
Using halo abundance matching over the redshift range $5<z<8$ and an analytic
description of gas accretion, we develop a model for the star formation
efficiency $f_*$ of dark matter halos at $z>6$ that matches the measured galaxy
luminosity functions at these redshifts. We find that $f_*$ peaks at $sim
10\%$ at halo masses $M sim 10^{11}$--$10^{12}$~M$_odot$, in qualitative
agreement with its behavior at lower redshifts. We then investigate the cosmic
star formation histories and the corresponding models of reionization for a
range of extrapolations to small halo masses. We compare these to a variety of
observations, using them to further constrain the characteristics of the galaxy
populations. Our approach provides an empirically-calibrated,
physically-motivated model for the properties of star-forming galaxies sourcing
the epoch of reionization. In the case where star formation in low-mass halos
is maximally efficient, an average escape fraction $sim0.1$ can reproduce the
optical depth reported by Planck, whereas inefficient star formation in these
halos requires either about twice as many UV photons to escape, or an escape
fraction that increases towards higher redshifts. Our models also predict how
future observations with JWST can improve our understanding of these galaxy
populations. | | Source: | arXiv, 1512.6219 | | Services: | Forum | Review | PDF | Favorites | |
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