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The Green Peas: Searching for LyC Emitters at Low Redshift

Published online by Cambridge University Press:  17 August 2016

Anne Jaskot
Affiliation:
Dept. of Astronomy, Smith College, Northampton, MA 01063, USA email: [email protected]
Sally Oey
Affiliation:
Dept. of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
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Abstract

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The escape fraction of Lyman continuum (LyC) radiation from galaxies remains one of the primary uncertainties in studies of reionization. However, few LyC-emitting galaxies are known. The recently identified, low-redshift “Green Pea” (GP) galaxies exhibit a number of similarities with high-redshift galaxies, and their optical emission lines suggest they may be some of the elusive LyC emitters. Recent HST COS and ACS observations of four GPs suggest further evidence for LyC escape and give new insights into the origins of Lyα and low-ionization UV lines in high-redshift galaxies. The Lyα emission and low-ionization emission and absorption lines provide a coherent physical picture of the neutral gas distribution in the GPs and may identify LyC emitters at high redshift. The rare, low-redshift GPs hint at possible factors that may enable LyC and Lyα escape from high-redshift galaxies.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016