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• W4297633641 endingPage "A10" @default.
• W4297633641 startingPage "A10" @default.
• W4297633641 abstract "We present rest-frame Ly$alpha$ equivalent widths (EW) of 417 Ly$alpha$ emitters (LAEs) detected with Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) at $2.9 < z < 6.6$ in the Hubble Ultra Deep Field. Based on the deep MUSE spectroscopy and ancillary Hubble Space Telescope (HST) photometry data, we carefully measured EW values taking into account extended Ly$alpha$ emission and UV continuum slopes ($beta$). Our LAEs reach unprecedented depths, both in Ly$alpha$ luminosities and UV absolute magnitudes, from log($L_{rm Lyalpha}$/erg s$^{-1}$) $sim$41.0 to 43.0 and from Muv $sim$ -16 to -21 (0.01-1.0 $L^{*}_{rm z=3}$). The EW values span the range of $sim$ 5 to 240 AA or larger, and their distribution can be well fitted by an exponential law $N = N_{rm 0}$ exp($-$EW/$w_{rm 0}$). Owing to the high dynamic range in Muv, we find that the scale factor, $w_{rm 0}$, depends on Muv in the sense that including fainter Muv objects increases $w_{rm 0}$, i.e., the Ando effect. The results indicate that selection functions affect the EW scale factor. Taking these effects into account, we find that our $w_{rm 0}$ values are consistent with those in the literature within $1sigma$ uncertainties at $2.9 < z < 6.6$ at a given threshold of Muv and $L_{rm Lyalpha}$. Interestingly, we find 12 objects with EW $>200$ AA above $1sigma$ uncertainties. Two of these 12 LAEs show signatures of merger or AGN activity: the weak CIV $lambda 1549$ emission line. For the remaining 10 very large EW LAEs, we find that the EW values can be reproduced by young stellar ages ($< 100$ Myr) and low metallicities ($lesssim 0.02$ $Z_{rm odot}$). Otherwise, at least part of the Ly$alpha$ emission in these LAEs needs to arise from anisotropic radiative transfer effects, fluorescence by hidden AGN or quasi-stellar object activity, or gravitational cooling." @default.
• W4297633641 created "2022-09-30" @default.
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• W4297633641 date "2017-11-29" @default.
• W4297633641 modified "2023-10-14" @default.
• W4297633641 title "The MUSE<i>Hubble</i>Ultra Deep Field Survey" @default.
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