A faint MUV = −14.5 Lyman-continuum leaker candidate in the epoch of reionization: Unprecedented Lyα properties at z = 5.725

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Volume 708 (April 2026)

A&A, 708 (2026) L2

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Table 1.

Lyα-related properties of AMORE6.

	B	A	B (MUSE)
$z_{sys}^{(a)}$ $Mathematical equation: $ \rm z_{sys}^{(a)} $$	5.7253	5.7253	5.7253
$δ {(z_{sys})}^{(a)}$ $Mathematical equation: $ \rm \delta(z_{sys})^{(a)} $$	0.0015	0.0030	0.0015
z_Lyα	5.7254	5.7256	5.7256
$δ {(z_{Ly α})}^{(b)}$ $Mathematical equation: $ \rm \delta(z_{\mathrm{Ly}\alpha})^{(b)} $$	0.0001	0.0001	0.0001
dv km s⁻¹	4 ± 67	13 ± 147	13 ± 147
FWHM_Lyα [Å]_c	1.83 ± 0.03	1.81 ± 0.04	3.06 ± 0.05
${FWHM}_{Ly α} {[\frac{km}{s}]}^{(d)}$ $Mathematical equation: $ \rm FWHM_{\mathrm{Ly}\alpha}\ \left[\frac{km}{s}\right]^{(d)} $$	58.2 ± 1.4	57.1 ± 1.7	63.6 ± 3.2
A_RB^(e)	$0 . 12_{- 0.05}^{+ 0.04}$ $Mathematical equation: $ 0.12^{+0.04}_{-0.05} $$	$0 . 19_{- 0.08}^{+ 0.05}$ $Mathematical equation: $ 0.19^{+0.05}_{-0.08} $$	$0 . 31_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.31^{+0.01}_{-0.01} $$
A_PERC^(e)	$0 . 11_{- 0.06}^{+ 0.06}$ $Mathematical equation: $ 0.11^{+0.06}_{-0.06} $$	$0 . 24_{- 0.10}^{+ 0.10}$ $Mathematical equation: $ 0.24^{+0.10}_{-0.10} $$	$0 . 06_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.06^{+0.01}_{-0.01} $$
f_Lyα[10⁻¹⁷cgs]	2.32 ± 0.05	1.72 ± 0.06	2.32 ± 0.05
mag_{Lyα,continuum}^(f)	$27 . 14_{- 0.08}^{+ 0.07}$ $Mathematical equation: $ 27.14^{+0.07}_{-0.08} $$	−	$27 . 14_{- 0.08}^{+ 0.07}$ $Mathematical equation: $ 27.14^{+0.07}_{-0.08} $$
EW_Lyα [Å]	$150_{- 12}^{+ 10}$ $Mathematical equation: $ 150^{+10}_{-12} $$	−	$150_{- 12}^{+ 10}$ $Mathematical equation: $ 150^{+10}_{-12} $$

Notes. The properties in Cols. 1 and 2 are taken from X-shooter data for images B and A, respectively; MUSE measurements for image B are also reported in Col. 3. (a) From M25; the uncertainty here is 3σ. NIRCam-WFSS at observed Hβ has R ∼ 1500, implying σ_z ∼ 0.004, or σ_v ∼ 200 km s⁻¹. (b) 5σ uncertainty (see text). (c) Observed FWHM. (d) Instrument- corrected FWHM. (e) RB and PERC asymmetry as defined in the text. (f) M_UV from M25 extrapolated to the observed Lyα continuum using β = −2.77.

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