An Updated Characterization of Luminous Ly alpha emitters at the End of Reionization

We present a multi-wavelength physical characterization of 14 luminous Ly α emitters (LAEs) at z about6, integrating deep ground-based Magellan/M2FS spectroscopy with heterogeneous JWST/NIRCam broad- and medium-band imaging. Identified via strong Ly α lines with extreme Ly α luminosities of > 10 42.6 erg s-1, the sample exhibits very large rest-frame equivalent widths (100 Å) and steeply blue UV continua (β median-2.2, -18.2>M 1500>-20.2 mag). Crucially, the integration of NIRCam medium-band photometry (F410M) breaks the degeneracy between strong rest-optical nebular emission and Balmer breaks, resolving prior mass overestimations. The tightly constrained spectral energy distribution modeling demonstrates that these luminous LAEs tend to be unequivocally low-mass, ultra-young dwarf starbursts; half the sample is characterized by stellar masses of M* < 10 8 M, ages 10 Myr, and negligible dust attenuation. We also map the production efficiency of ionizing photons and Ly α escape fractions (f esc Lyα). The f esc Lyα values are exceptionally high, with a median of 40 %, increasing for the bluer UV continua. Finally, analyzing spatial offsets between the Ly α centroid and the stellar counterpart, we demonstrate empirically that internal dust content, rather than neutral hydrogen gas, dominate the suppression of Ly α radiative transfer. Our study reveals that strong Ly α emission of the luminous LAEs are generally attributed to both the vigorous starburst activities and the high f esc Lyα. Resembling Lyman continuum leakers, these extreme dwarf systems function as highly efficient ionizing engines at the conclusion of the Epoch of Reionization.