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Journal Articles The Astrophysical Journal Supplement Series Year : 2022

The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters

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Sophia R Flury
Anne E Jaskot
Harry C Ferguson
John Chisholm
Stephan Mccandliss
Bingjie Wang
N M Ford
Timothy Heckman
Zhiyuan Ji
Mauro Giavalisco
Ricardo Amorin
Sanchayeeta Borthakur
Cody Carr
Marco Castellano
Stephane de Barros
Brian Fleming
Fabio Fontanot
Thibault Garel
  • Function : Author
Andrea Grazian
  • Function : Author
Matthew Hayes
Alaina Henry
Valentin Mauerhofer
  • Function : Author
Genoveva Micheva
M S Oey
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
Xinfeng Xu

Abstract

Abstract The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics to infer the rate at which galaxies contribute LyC photons to reionize the universe by studying lower-redshift analogs. We present the Low-redshift Lyman Continuum Survey (LzLCS) comprising measurements made with the Hubble Space Telescope Cosmic Origins Spectrograph for a z = 0.2–0.4 sample of 66 galaxies. After careful processing of the far-UV spectra, we obtain a total of 35 Lyman continuum emitters (LCEs) detected with 97.725% confidence, nearly tripling the number of known local LCEs. We estimate escape fractions from the detected LyC flux and upper limits on the undetected LyC flux, finding a range of LyC escape fractions up to 50%. Of the 35 LzLCS LCEs, 12 have LyC escape fractions greater than 5%, more than doubling the number of known local LCEs with cosmologically relevant LyC escape.
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Dates and versions

hal-03817541 , 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. I. New, Diverse Local Lyman Continuum Emitters. The Astrophysical Journal Supplement Series, 2022, 260 (1), pp.1. ⟨10.3847/1538-4365/ac5331⟩. ⟨hal-03817541⟩
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