Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies
By M. Trebitsch, Jérémy Blaizot, J. Rosdahl, J. Devriendt, A. Slyz. 2017
142 citations recorded by the source corpus.
Low mass galaxies are thought to provide the bulk of the ionizing radiation necessary to reionize the Universe. The amount of photons escaping the galaxies is poorly constrained theoretically, and difficult to measure observationally. Yet it is an essential parameter of reionization models. We study in detail how ionizing radiation can leak from high redshift galaxies. For this purpose, we use a series of high resolution radiation hydrodynamics simulations, zooming on three dwarf galaxies in a cosmological context. We find that the energy and momentum input from the supernova explosions has a pivotal role in regulating the escape fraction, by disrupting dense star forming clumps, and clearing sight lines in the halo. In the absence of supernovae, photons are absorbed very locally, within the birth clouds of massive stars. We follow the time evolution of the escape fraction, and find that it can vary by more than six orders of magnitude. This explains the large scatter in the value of the escape fraction found by previous studies. This fast variability also impacts the observability of the sources of reionization: a survey even as deep as $M_{\rm UV} = -14$ would miss about half of the underlying population of Lyman-continuum emitters.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/705a5d1cd338a82ca462fbb97f6a22228efb84b6
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Citations in the corpus
- Large Ly α opacity fluctuations and low CMB τ in models of late reionization with large islands of neutral hydrogen extending to z < 5.5 (2018, background): “…to the evolution of the escape fraction of ionizing photons from galaxies, possibly due to changes in morphology, stellar populations, and dust con- tent of these galaxies (Rosdahl et al. 2018; Trebitsch et al. 2017; Kimm et al. 2017; Paardekooper et al. 2015; Kimm & Cen 2014; Yajima et al. 2011).”
- Inferences on the timeline of reionization at z ∼ 8 from the KMOS Lens-Amplified Spectroscopic Survey (2019, background): “…many degeneracies between these reionization parameters, and certainly the escape fraction is unlikely to be constant for all galaxies at all times (Trebitsch et al. 2017), but non-detections of high-redshift GRB host galaxies, and observations of lensed high-redshift galaxies, and local dwarfs,…”
- Rapid Reionization by the Oligarchs: The Case for Massive, UV-bright, Star-forming Galaxies with High Escape Fractions (2019, background): “…turbulence, and feedback carving out channels in the ISM through which LyC photons can stream out of the galaxy (e.g., Ma et al. 2016; Safarzadeh & Scannapieco 2016; Sharma et al. 2016; Trebitsch et al. 2017; Katz et al. 2018; Rosdahl et al. 2018; Kakiichi & Gronke 2019; Kimm et al. 2019).”
- Low-redshift Lyman continuum leaking galaxies with high [O iii]/[O ii] ratios (2018, background): “It has also been suggested that fesc(LyC) tends to be higher in low-mass galaxies (Wise et al. 2014; Trebitsch et al. 2017).”
- The SPHINX Cosmological Simulations of the First Billion Years: the Impact of Binary Stars on Reionization★ (2018, methodology): “We use the mechanical SN model for momentum injection from Kimm et al. (2015, see also Kimm et al. 2016, 2017; Rosdahl et al. 2017; Trebitsch et al. 2017a, and a similar model described in Hopkins et al. 2014).”
- The Universe Is Reionizing at z ∼ 7: Bayesian Inference of the IGM Neutral Fraction Using Lyα Emission from Galaxies (2017, background): “…mass in complementary ways (i.e. low mass halos host galaxies with a low stellar mass fraction and high escape fraction, e.g., Kimm et al. 2017; Trebitsch et al. 2017), over the relevant range of halo masses which host galaxies which dominate reionization (Mh∼< 1011M , e.g., Kimm et al. 2017),…”