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Journal Articles The Astrophysical Journal Year : 2022

The Low-redshift Lyman Continuum Survey. II. New Insights into LyC Diagnostics

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Sophia R Flury
Anne E Jaskot
Harry C Ferguson
John Chisholm
Stephan R Mccandliss
Xinfeng Xu
Bingjie Wang
M S Oey
N M Ford
Timothy Heckman
Zhiyuan Ji
Mauro Giavalisco
Ricardo Amorín
Sanchayeeta Borthakur
Cody Carr
Marco Castellano
Stephane De Barros
Mark Dickinson
Steven L Finkelstein
Brian Fleming
Fabio Fontanot
Thibault Garel
  • Function : Author
Andrea Grazian
Matthew Hayes
Alaina Henry
Valentin Mauerhofer
  • Function : Author
Genoveva Micheva
Goran Ostlin
Casey Papovich
Laura Pentericci
Swara Ravindranath
  • Function : Author
Joakim A Rosdahl
Michael Rutkowski
Paola Santini
Claudia Scarlata
Harry Teplitz
Trinh Thuan
  • Function : Author
Maxime Trebitsch
Eros Vanzella
Anne Verhamme
  • Function : Author

Abstract

The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z  6) owing to intergalactic H I absorption. To identify LyC emitters (LCEs) and infer the fraction of escaping LyC, astronomers have developed various indirect diagnostics of LyC escape. Using measurements of the LyC from the Low-redshift Lyman Continuum Survey (LzLCS), we present the first statistical test of these diagnostics. While optical depth indicators based on Lyα, such as peak velocity separation and equivalent width, perform well, we also find that other diagnostics, such as the [O III]/[O II] flux ratio and star formation rate surface density, predict whether a galaxy is an LCE. The relationship between these galaxy properties and the fraction of escaping LyC flux suggests that LyC escape depends strongly on H I column density, ionization parameter, and stellar feedback. We find that LCEs occupy a range of stellar masses, metallicities, star formation histories, and ionization parameters, which may indicate episodic and/or different physical causes of LyC escape.
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Dates and versions

hal-03817556 , version 1 (17-10-2022)

Licence

Attribution - CC BY 4.0

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Cite

Sophia R Flury, Anne E Jaskot, Harry C Ferguson, Gábor Worseck, Kirill Makan, et al.. The Low-redshift Lyman Continuum Survey. II. New Insights into LyC Diagnostics. The Astrophysical Journal, 2022, 930 (2), pp.126. ⟨10.3847/1538-4357/ac61e4⟩. ⟨hal-03817556⟩
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