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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2024

Linking UV spectral properties of MUSE Ly α emitters at z ≳ 3 to Lyman continuum escape

I Kramarenko
J Kerutt
  • Fonction : Auteur
P Oesch
L Barrufet
J Matthee
H Kusakabe
  • Fonction : Auteur
T Thai
  • Fonction : Auteur

Résumé

ABSTRACT The physical conditions giving rise to high escape fractions of ionizing radiation (LyC fesc) in star-forming galaxies – most likely protagonists of cosmic reionization – are not yet fully understood. Using the VLT/MUSE observations of ∼1400 Ly α emitters at 2.9 < z < 6.7, we compare stacked rest-frame UV spectra of candidates for LyC leakers and non-leakers selected based on their Ly α profiles. We find that the stacks of potential LyC leakers, i.e. galaxies with narrow, symmetric Ly α profiles with small peak separation, generally show (i) strong nebular O iii]λ1666, [Si iii]λ1883, and [C iii]λ1907 +C iii]λ1909 emission, indicating a high-ionization state of the interstellar medium (ISM); (ii) high equivalent widths of He iiλ1640 (∼1 − 3 Å), suggesting the presence of hard ionizing radiation fields; (iii) Si ii*λ1533 emission, revealing substantial amounts of neutral hydrogen off the line of sight; (iv) high C ivλλ1548,1550 to [C iii]λ1907 +C iii]λ1909 ratios (C iv/C iii] ≳0.75) , signalling the presence of low column density channels in the ISM. In contrast, the stacks with broad, asymmetric Ly α profiles with large peak separation show weak nebular emission lines, low He iiλ1640 equivalent widths (≲1 Å), and low C iv/C iii] (≲0.25), implying low-ionization states and high-neutral hydrogen column densities. Our results suggest that C iv/C iii] might be sensitive to the physical conditions that govern LyC photon escape, providing a promising tool for identification of ionizing sources among star-forming galaxies in the epoch of reionization.
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Dates et versions

hal-04505602 , version 1 (15-03-2024)

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I Kramarenko, J Kerutt, A Verhamme, P Oesch, L Barrufet, et al.. Linking UV spectral properties of MUSE Ly α emitters at z ≳ 3 to Lyman continuum escape. Monthly Notices of the Royal Astronomical Society, 2024, 527 (4), pp.9853-9871. ⟨10.1093/mnras/stad3853⟩. ⟨hal-04505602⟩
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