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No correlation of t...
No correlation of the Lyman continuum escape fraction with spectral hardness
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Marques-Chaves, R. (author)
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Schaerer, D. (author)
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Amorín, R. O. (author)
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Atek, H. (author)
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Borthakur, S. (author)
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Chisholm, J. (author)
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Fernández, V. (author)
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Flury, S. R. (author)
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Giavalisco, M. (author)
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Grazian, A. (author)
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- Hayes, Matthew J. (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Heckman, T. M. (author)
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Henry, A. (author)
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Izotov, Y. I. (author)
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Jaskot, A. E. (author)
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Ji, Z. (author)
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McCandliss, S. R. (author)
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Oey, M. S. (author)
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- Östlin, Göran (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Ravindranath, S. (author)
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Rutkowski, M. J. (author)
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Saldana-Lopez, A. (author)
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Teplitz, H. (author)
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Thuan, T. X. (author)
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Verhamme, A. (author)
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Wang, B. (author)
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Worseck, G. (author)
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Xu, X. (author)
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(creator_code:org_t)
- 2022-07-01
- 2022
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 663
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- The properties that govern the production and escape of hydrogen-ionizing photons (Lyman continuum, LyC; with energies > 13.6 eV) in star-forming galaxies are still poorly understood, but they are key to identifying and characterizing the sources that reionized the Universe. Here we empirically explore the relation between the hardness of ionizing radiation and the LyC leakage in a large sample of low-z star-forming galaxies from the recent Hubble Space Telescope Low-z Lyman Continuum Survey. Using Sloan Digital Sky Survey stacks and deep X-shooter observations, we investigate the hardness of the ionizing spectra (QHe+/QH) between 54.4 eV (He+) and 13.6 eV (H) from the optical recombination lines He II 4686 Å and Hβ 4861 Å for galaxies with LyC escape fractions spanning a wide range, fesc(LyC) ≃ 0−90%. We find that the observed intensity of He II/Hβ is primarily driven by variations in the metallicity, but is not correlated with LyC leakage. Both very strong (esc(LyC)> ≃ 0.5) and nonleakers (esc(LyC)> ≃ 0) present similar observed intensities of He II and Hβ at comparable metallicity, between ≃0.01 and ≃0.02 for 12 + log(O/H)> 8.0 and < 8.0, respectively. Our results demonstrate that QHe+/QH does not correlate with fesc(LyC), which implies that strong LyC emitters do not show harder ionizing spectra than nonleakers at similar metallicity.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: starburst
- galaxies: high-redshift
- dark ages
- reionization
- first stars
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Marques-Chaves, ...
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Schaerer, D.
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Amorín, R. O.
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Atek, H.
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Borthakur, S.
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Chisholm, J.
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show more...
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Fernández, V.
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Flury, S. R.
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Giavalisco, M.
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Grazian, A.
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Hayes, Matthew J ...
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Heckman, T. M.
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Henry, A.
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Izotov, Y. I.
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Jaskot, A. E.
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Ji, Z.
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McCandliss, S. R ...
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Oey, M. S.
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Östlin, Göran
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Ravindranath, S.
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Rutkowski, M. J.
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Saldana-Lopez, A ...
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Teplitz, H.
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Thuan, T. X.
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Verhamme, A.
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Wang, B.
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Worseck, G.
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Xu, X.
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show less...
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- NATURAL SCIENCES
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Astronomy and As ...
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Stockholm University