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Tracing Lyα and LyC...
Tracing Lyα and LyC Escape in Galaxies with Mg ıı Emission
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Xu, Xinfeng (author)
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Henry, Alaina (author)
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Heckman, Timothy (author)
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Chisholm, John (author)
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Worseck, Gábor (author)
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Gronke, Max (author)
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Jaskot, Anne (author)
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McCandliss, Stephan R. (author)
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Flury, Sophia R. (author)
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Giavalisco, Mauro (author)
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Ji, Zhiyuan (author)
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Amorín, Ricardo O. (author)
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Berg, Danielle A. (author)
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Borthakur, Sanchayeeta (author)
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Bouche, Nicolas (author)
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Carr, Cody (author)
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Erb, Dawn K. (author)
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Ferguson, Harry (author)
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Garel, Thibault (author)
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- Hayes, Matthew J. (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Makan, Kirill (author)
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Marques-Chaves, Rui (author)
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Rutkowski, Michael (author)
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- Östlin, Göran (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Rafelski, Marc (author)
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Saldana-Lopez, Alberto (author)
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Scarlata, Claudia (author)
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Schaerer, Daniel (author)
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Trebitsch, Maxime (author)
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Tremonti, Christy (author)
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Verhamme, Anne (author)
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Wang, Bingjie (author)
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(creator_code:org_t)
- 2022-07-14
- 2022
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 933:2
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https://doi.org/10.3...
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Abstract
Subject headings
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- Star-forming galaxies are considered the likeliest source of the H i ionizing Lyman continuum (LyC) photons that reionized the intergalactic medium at high redshifts. However, above z ≳ 6, the neutral intergalactic medium prevents direct observations of LyC. Therefore, recent years have seen the development of indirect indicators for LyC that can be calibrated at lower redshifts and applied in the epoch of reionization. Emission from the Mg ıı λλ2796, 2803 doublet has been proposed as a promising LyC proxy. In this paper, we present new Hubble Space Telescope/Cosmic Origins Spectrograph observations for eight LyC emitter candidates, selected to have strong Mg ii emission lines. We securely detect LyC emission in 50% (4/8) of the galaxies with 2σ significance. This high detection rate suggests that strong Mg ii emitters might be more likely to leak LyC than similar galaxies without strong Mg ıı. Using photoionization models, we constrain the escape fraction of Mg ii as ∼15%–60%. We confirm that the escape fraction of Mg ıı correlates tightly with that of Lyα, which we interpret as an indication that the escape fraction of both species is controlled by resonant scattering in the same low column density gas. Furthermore, we show that the combination of the Mg ıı emission and dust attenuation can be used to estimate the escape fraction of LyC statistically. These findings confirm that Mg ıı emission can be adopted to estimate the escape fraction of Lyα and LyC in local star-forming galaxies and may serve as a useful indirect indicator at the epoch of reionization.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Ultraviolet astronomy
- Starburst galaxies
- Interstellar dust
- Reionization
- Emission line galaxies
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Xu, Xinfeng
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Henry, Alaina
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Heckman, Timothy
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Chisholm, John
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Worseck, Gábor
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Gronke, Max
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show more...
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Jaskot, Anne
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McCandliss, Step ...
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Flury, Sophia R.
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Giavalisco, Maur ...
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Ji, Zhiyuan
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Amorín, Ricardo ...
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Berg, Danielle A ...
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Borthakur, Sanch ...
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Bouche, Nicolas
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Carr, Cody
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Erb, Dawn K.
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Ferguson, Harry
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Garel, Thibault
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Hayes, Matthew J ...
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Makan, Kirill
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Marques-Chaves, ...
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Rutkowski, Micha ...
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Östlin, Göran
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Rafelski, Marc
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Saldana-Lopez, A ...
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Scarlata, Claudi ...
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Schaerer, Daniel
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Trebitsch, Maxim ...
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Tremonti, Christ ...
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Verhamme, Anne
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Wang, Bingjie
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
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Stockholm University