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

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 ( $\Delta v=101_{-19}^{+38} (\pm 48)\, \rm km\, \rm s^{-1}$ ) suggests an extremely high escape fraction of ionizing photons $ 59(51){{\ \rm per\ cent}} (2\sigma)$ . The spectral energy distribution indicates a young (50 Myr), star-forming ( $12\pm 6 \, \rm {M}_\odot \rm {yr}^{-1}$ ) 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.
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Submitted on : Friday, July 1, 2022 - 1:59:27 PM
Last modification on : Saturday, July 2, 2022 - 3:40:15 AM

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Romain A. Meyer, Nicolas Laporte, Richard S. Ellis, Anne Verhamme, Thibault Garel. 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, 2021, 500, pp.558-564. ⟨10.1093/mnras/staa3216⟩. ⟨insu-03711509⟩

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