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THE SPECTRAL EVOLUTION OF THE FIRST GALAXIES. II. SPECTRAL SIGNATURES OF LYMAN CONTINUUM LEAKAGE FROM GALAXIES IN THE REIONIZATION EPOCH
Open accessAbstract
The fraction of ionizing photons that escape ( f esc ) from z ≳ 6 galaxies is an important parameter for assessing the role of these objects in the reionization of the universe, but the opacity of the intergalactic medium precludes a direct measurement of f esc for individual galaxies at these epochs. We argue that since f esc regulates the impact of nebular emission on the spectra of galaxies, it should nonetheless be possible to indirectly probe f esc well into the reionization epoch. As a first step, we demonstrate that by combining measurements of the rest-frame UV slope β with the equivalent width of the Hβ emission line, galaxies with very high Lyman continuum escape fractions ( f esc ⩾ 0.5) should be identifiable up to z ≈ 9 through spectroscopy with the upcoming James Webb Space Telescope ( JWST ). By targeting strongly lensed galaxies behind low-redshift galaxy clusters, JWST spectra of sufficiently good quality can be obtained for M 1500 ≲ −16.0 galaxies at z ≈ 7 and for M 1500 ≲ −17.5 galaxies at z ≈ 9. Dust-obscured star formation may complicate the analysis, but supporting observations with ALMA or the planned SPICA mission may provide useful constraints on this effect.
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Cites
Starburst99: Synthesis Models for Galaxies with Active Star Formation
Leitherer, C., Schaerer, D., Goldader, J. D., Delgado, R. M. G., Robert, C., Kune, D. F., de Mello, D. F., Devost, D., & Heckman, T. M. (1999) · The Astrophysical Journal Supplement Series · doi:10.1086/313233 · Cited by 4,126
Cited by
Hydrogen Epoch of Reionization Array (HERA)
DeBoer, D. R., Parsons, A. R., Aguirre, J. E., Alexander, P., Ali, Z. S., Beardsley, A. P., Bernardi, G., Bowman, J. D., Bradley, R. F., Carilli, C. L., et al. (2017) · Publications of the Astronomical Society of the Pacific · doi:10.1088/1538-3873/129/974/045001 · Cited by 658
Early galaxy formation and its large-scale effects
Dayal, P., & Ferrara, A. (2018) · Physics Reports · doi:10.1016/j.physrep.2018.10.002 · Cited by 403
Nakajima, K., & Ouchi, M. (2014) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stu902 · Cited by 351
Metadata
- Authors
- Zackrisson, E., Inoue, A. K., & Jensen, H.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2013-10-11
- Volume
- 777
- Issue
- 1
- Pages
- 39
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2092066132
- Cited by
- 189
- References
- 1
- FWCI
- 4.92
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: THE SPECTRAL EVOLUTION OF THE FIRST GALAXIES. II. SPECTRAL SIGNATURES OF LYMAN CONTINUUM LEAKAGE FROM GALAXIES IN THE REIONIZATION EPOCH. https://app.cochat.ai/papers/10.1088/0004-637x/777/1/39
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- Zackrisson, E., Inoue, A. K., & Jensen, H. (2013). THE SPECTRAL EVOLUTION OF THE FIRST GALAXIES. II. SPECTRAL SIGNATURES OF LYMAN CONTINUUM LEAKAGE FROM GALAXIES IN THE REIONIZATION EPOCH. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/777/1/39
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