Semi-analytic forecasts for JWST-IV. Implications for cosmic reionization and LyC escape fraction

L. Y. Aaron Yung, Rachel S. Somerville, Steven L. Finkelstein, Gergö Popping, Romeel Davé, Aparna Venkatesan, Peter Behroozi, Harry C. Ferguson

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Galaxies forming in low-mass haloes are thought to be primarily responsible for reionizing the Universe during the first billion years after the big bang. Yet, these haloes are extremely inefficient at forming stars in the nearby Universe. In this work, we address this apparent tension, and ask whether a physically motivated model of galaxy formation that reproduces the observed abundance of faint galaxies in the nearby Universe is also consistent with available observational constraints on the reionization history. By interfacing the Santa Cruz semi-analytic model for galaxy formation with an analytic reionization model, we constructed a computationally efficient pipeline that connects 'ground-level' galaxy formation physics to 'top-level' cosmological-scale observables. Based on photometric properties of the galaxy populations predicted up to z = 15, we compute the reionization history of intergalactic hydrogen. We quantify the three degenerate quantities that influence the total ionizing photon budget, including the abundance of galaxies, the intrinsic production rate of ionizing photons, and the LyC escape fraction. We explore covariances between these quantities using a Markov chain Monte Carlo method. We find that our locally calibrated model is consistent with all currently available constraints on the reionization history, under reasonable assumptions about the LyC escape fraction. We quantify the fraction of ionizing photons produced by galaxies of different luminosities and find that the galaxies expected to be detected in James Webb Space Telescope Near-Infrared Camera (NIRCam) wide and deep surveys are responsible for producing ∼40-80 per cent of ionizing photons throughout the Epoch of Reionization. All results presented in this work are available at https://www.simonsfoundation.org/semi-analytic-forecasts-for-jwst/.

Original languageEnglish (US)
Pages (from-to)4574-4592
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number4
DOIs
StatePublished - Aug 1 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmology: theory
  • Dark ages, reioniza-tion, first stars
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: high-redshifts
  • Galaxies: star formation

Fingerprint

Dive into the research topics of 'Semi-analytic forecasts for JWST-IV. Implications for cosmic reionization and LyC escape fraction'. Together they form a unique fingerprint.

Cite this