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- W1792022697 abstract "We present the properties of Ly|$alpha$| emitters (LAEs) at |$z=5.7$| in the Subaru Deep Field. A photometric sample of 89 LAE candidates was constructed from narrow-band data down to |$mathit{NB816} = 26.0$| (AB) in a continuous |$725 ,mathrm{arcmin}^2$| area. Spectra of 39 objects satisfying the photometric selection criteria for LAEs were obtained with Subaru and Keck II Telescopes, among which 28 were confirmed LAEs, one was a nearby galaxy, and eight were unclassified. We also obtained spectra of another 24 NB816-excess objects in the field, identifying six additional LAEs. We find that the Ly|$alpha$| luminosity function derived from the photometric sample is reproduced well by a Schechter function with |$L^star = 7.9^{+3.0}_{-2.2} times 10^{42} ,mathrm{erg} ,mathrm{s}^{-1}$| and |$phi^star = 6.3^{+3.0}_{-2.0} times 10^{-4} ,mathrm{Mpc}^{-3}$| for |$alpha =-1.5$| (fixed) over the whole luminosity range of |$L simeq 3 times 10^{42} hbox{--} 3 times 10^{43} ,mathrm{erg} ,mathrm{s}^{-1}$|. We then measured the rest-frame Ly|$alpha$| equivalent widths for the confirmed LAEs, to find that the median among the 28 objects satisfying the photometric selection criteria is |$W_{0}^{mathrm{i}} = 233 ,{Å}$|. We infer that 30%-40% of LAEs at |$z=5.7$| exceed |$W_{0}^{mathrm{i}} = 240 ,{Å}$|. These large-EW objects probably cannot be accounted for by ordinary star-forming populations with a Salpeter IMF. We also find that LAEs with fainter far-UV luminosities have larger EWs. Finally, we derived the far-UV luminosity function of LAEs down to |$M_{mathrm{UV}} simeq-19.6$| using the photometric sample, and compared it with that of Lyman-break galaxies (LBGs). We find that as high as about 80% of LBGs at |$z sim 6$| have |$W_{0}^{mathrm{i}} ge 100 ,{Å}$|, in sharp contrast to lower-|$z$| counterparts." @default.
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- W1792022697 date "2006-04-25" @default.
- W1792022697 modified "2023-10-16" @default.
- W1792022697 title "Lyα Emitters at<i>z</i>= 5.7 in the Subaru Deep Field" @default.
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- W1792022697 doi "https://doi.org/10.1093/pasj/58.2.313" @default.
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