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Constraining Lyman continuum escape using Machine Learning

Published online by Cambridge University Press:  08 May 2018

Sambit K. Giri Open the ORCID record for Sambit K. Giri [Opens in a new window] ,
Erik Zackrisson ,
Christian Binggeli ,
Kristiaan Pelckmans ,
Rubén Cubo  and
Garrelt Mellema
Sambit K. Giri*
Affiliation:
Department of Astronomy and Oskar Klein Centre, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden
Erik Zackrisson
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Christian Binggeli
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Kristiaan Pelckmans
Affiliation:
Department of Information Technology, Division of Systems and Control (Syscon), Uppsala University, Box 337, SE-751 05 Uppsala, Sweden
Rubén Cubo
Affiliation:
Department of Information Technology, Division of Systems and Control (Syscon), Uppsala University, Box 337, SE-751 05 Uppsala, Sweden
Garrelt Mellema
Affiliation:
Department of Astronomy and Oskar Klein Centre, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden
*
*email: sambit.giri@astro.su.se
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Abstract

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The James Webb Space Telescope (JWST) will observe the rest-frame ultraviolet/optical spectra of galaxies from the epoch of reionization (EoR) in unprecedented detail. While escaping into the intergalactic medium, hydrogen-ionizing (Lyman continuum; LyC) photons from the galaxies will contribute to the bluer end of the UV slope and make nebular emission lines less prominent. We present a method to constrain leakage of the LyC photons using the spectra of high redshift (z ≳ 6) galaxies. We simulate JWST/NIRSpec observations of galaxies at z =6–9 by matching the fluxes of galaxies observed in the Frontier Fields observations of galaxy cluster MACS-J0416. Our method predicts the escape fraction fesc with a mean absolute error Δfesc ≈ 0.14. The method also predicts the redshifts of the galaxies with an error $\left\langle \frac{\Delta z}{(1+z)}\right\rangle \approx 0.0003$.

Keywords

Galaxies: high-redshift – dark agesreionizationfirst stars – gravitational lensing: strong
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 254 - 258
Copyright
Copyright © International Astronomical Union 2018 

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