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Double-peaked Lyman α emission at z = 6.803: a reionization-era galaxy self-ionizing its local H II bubble

Meyer, RA; Laporte, N; Ellis, RS; Verhamme, A; Garel, T; (2021) Double-peaked Lyman α emission at z = 6.803: a reionization-era galaxy self-ionizing its local H II bubble. Monthly Notices of the Royal Astronomical Society , 500 (1) pp. 558-564. 10.1093/mnras/staa3216. Green open access

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Abstract

We report the discovery of a double-peaked Lyman α profile in a galaxy at z = 6.803, A370p_z1, in the parallel Frontier Field of Abell 370. The velocity separation between the blue and red peaks of the Lyman α profile (⁠Δ v = 101^{+38}_{-19}(±48)km s^{-1}) suggests an extremely high escape fraction of ionizing photons >59(51) per cent (2σ). The spectral energy distribution indicates a young (50 Myr), star-forming (⁠12 ± 6M_{⊙}yr^{-1}) galaxy with an IRAC excess implying strong [O III] + H β emission. On the basis of the high escape fraction measured, we demonstrate that A370p_z1 was solely capable of creating an ionized bubble sufficiently large to account for the blue component of its Lyman α profile. We discuss whether A370p_z1 may be representative of a larger population of luminous z ≃ 7 double-peaked Lyman α emitting sources with high escape fractions that self-ionized their surroundings without contributions from associated ultraviolet-fainter sources.

Type: Article
Title: Double-peaked Lyman α emission at z = 6.803: a reionization-era galaxy self-ionizing its local H II bubble
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/staa3216
Publisher version: http://dx.doi.org/10.1093/mnras/staa3216
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: galaxies: high-redshift, dark ages, reionization, first stars
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10112704
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