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• W2788795536 endingPage "2840" @default.
• W2788795536 startingPage "2817" @default.
• W2788795536 abstract "Deep narrow-band surveys have revealed a large population of faint Ly α emitters (LAEs) in the distant Universe, but relatively little is known about the most luminous sources (⁠|$rm {it L}_{rm Lyalpha } gtrsim 10^{42.7}$| erg s−1; |$L_{rm Lyalpha }gtrsim L^*_{rm Lyalpha }$|⁠). Here we present the spectroscopic follow-up of 21 luminous LAEs at z ∼ 2–3 found with panoramic narrow-band surveys over five independent extragalactic fields (≈4 × 106 Mpc3 surveyed at z ∼ 2.2 and z ∼ 3.1). We use WHT/ISIS, Keck/DEIMOS, and VLT/X-SHOOTER to study these sources using high ionization UV lines. Luminous LAEs at z ∼ 2–3 have blue UV slopes (⁠|$beta =-2.0^{+0.3}_{-0.1}$|⁠) and high Ly α escape fractions (⁠|$50^{+20}_{-15}$| per cent) and span five orders of magnitude in UV luminosity (MUV ≈ −19 to −24). Many (70 per cent) show at least one high ionization rest-frame UV line such as C iv, N v, C iii], He ii or O iii], typically blue-shifted by ≈100–200 km s−1 relative to Ly α. Their Ly α profiles reveal a wide variety of shapes, including significant blue-shifted components and widths from 200 to 4000 km s−1. Overall, 60 ± 11 per cent appear to be active galactic nucleus (AGN) dominated, and at LLyα > 1043.3 erg s−1 and/or MUV < −21.5 virtually all LAEs are AGNs with high ionization parameters (log U = 0.6 ± 0.5) and with metallicities of ≈0.5 − 1 Z⊙. Those lacking signatures of AGNs (40 ± 11 per cent) have lower ionization parameters (⁠|$log U=-3.0^{+1.6}_{-0.9}$| and log ξion = 25.4 ± 0.2) and are apparently metal-poor sources likely powered by young, dust-poor ‘maximal’ starbursts. Our results show that luminous LAEs at z ∼ 2–3 are a diverse population and that |$2times ,L^*_{rm Lyalpha }$| and |$2times ,M_{rm UV}^*$| mark a sharp transition in the nature of LAEs, from star formation dominated to AGN dominated." @default.
• W2788795536 created "2018-03-06" @default.
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• W2788795536 date "2018-03-24" @default.
• W2788795536 modified "2023-10-14" @default.
• W2788795536 title "The nature of luminous Ly α emitters at z ∼ 2–3: maximal dust-poor starbursts and highly ionizing AGN" @default.
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