2018MNRAS.477.2817S

Query : 2018MNRAS.477.2817S

2018MNRAS.477.2817S - Mon. Not. R. Astron. Soc., 477, 2817-2840 (2018/June-3)

The nature of luminous Ly α emitters at z ∼ 2-3: maximal dust-poor starbursts and highly ionizing AGN.

SOBRAL D., MATTHEE J., DARVISH B., SMAIL I., BEST P.N., ALEGRE L., ROTTGERING H., MOBASHER B., PAULINO-AFONSO A., STROE A. and OTEO I.

Abstract (from CDS):

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 ( L_ Lyα_ ≳1042.7 erg s–1; L_ Lyα_≳L^*_ Lyα_). 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 x 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 (β=-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 (logU=-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 2×L^*_ Lyα_ and 2×M_ UV_^* mark a sharp transition in the nature of LAEs, from star formation dominated to AGN dominated.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: high-redshift - galaxies: ISM - galaxies: starburst - cosmology: observations

VizieR on-line data: <Available at CDS (J/MNRAS/477/2817): table2.dat sp/*>

Nomenclature: Table 2: [SMD2018b] SSA22-NB5-NN (Nos 10, 14, 18), [SMD2018b] GN-NB5-NNNN (Nos 3378, 5878, 6712).

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 CALYMHA -S16-438 EmO 02 16 08.734 -05 18 56.70           ~ 1 0
2 CALYMHA -S16-415 EmG 02 16 33.29 -05 17 57.8           ~ 1 0
3 AS2UDS 0173.0 QSO 02 17 32.417 -05 12 51.09   22.45345 21.48767 21.61290   ~ 10 0
4 CALYMHA -S16-373 EmG 02 17 46.0930 -05 02 54.974 23.7 23.6       ~ 6 0
5 NAME Himiko EmG 02 17 57.6122 -05 08 44.898           ~ 113 0
6 GD 71 WD* 05 52 27.6198591816 +15 53 13.228887444 11.675 12.783 13.032 13.169 13.337 DA1.5 407 0
7 HD 50767 * 06 55 37.1980480296 +24 00 28.902678516   7.59 7.75     B2V 33 0
8 HD 66665 bC? 08 04 47.8516524576 +06 11 09.803109264 6.5 7.58 7.81     B1V 85 0
9 CALYMHA -S16-147 EmG 10 00 13.909 +01 39 24.30           ~ 4 0
10 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
11 COSMOS2015 338645 EmG 10 00 58.01148 +01 48 15.3000           ~ 101 0
12 CALYMHA -S16-95 EmG 10 01 06.55 +01 45 45.5           ~ 3 0
13 CALYMHA -S16-85 EmO 10 01 17.531 +02 09 54.37           ~ 1 0
14 COSMOS2015 809358 EmG 10 01 24.80 +02 31 45.4           ~ 19 0
15 CALYMHA -S16-67 EmG 10 01 36.21 +02 15 16.8           ~ 3 0
16 [SMD2018b] GN-NB5-6712 EmG 12 36 07.98 +62 23 14.1           ~ 1 0
17 GNS 2923 EmG 12 36 19.4549 +62 15 02.570   25.4869   23.78 24.4361 ~ 15 1
18 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
19 GOODS J123721.64+621350.5 EmG 12 37 21.6380 +62 13 50.466   25.9076 25.28 25.14 24.8068 ~ 9 0
20 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 268 0
21 B-HiZELS NB501 55 EmG 14 29 32.4 +33 33 34         24.3 ~ 2 0
22 B-HiZELS 29 EmG 14 30 28.6 +33 33 29         23.5 ~ 2 0
23 B-HiZELS NB501 27 EmG 14 30 32.6 +33 59 22         24.3 ~ 2 0
24 B-HiZELS 16 EmG 14 30 40.3 +34 03 21         22.8 ~ 2 0
25 B-HiZELS NB921 198 EmG 14 30 46.1 +33 20 25         23.3 ~ 2 0
26 B-HiZELS NB501 34 EmG 14 31 03.8 +33 34 46         24.2 ~ 2 0
27 B-HiZELS NB501 13 EmG 14 31 05.8 +33 25 08         21.9 ~ 2 0
28 B-HiZELS NB501 16 EmG 14 31 06.5 +34 04 24         23.4 ~ 2 0
29 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0
30 B-HiZELS NB501 4 EmG 14 32 30.5 +33 39 57         22.9 ~ 2 0
31 B-HiZELS NB501 9 EmG 14 32 56.9 +33 39 50         23.0 ~ 2 0
32 B-HiZELS NB501 6 QSO 14 33 21.871 +33 54 20.32       22.46 21.98 ~ 6 0
33 B-HiZELS NB501 10 EmG 14 33 23.8 +33 38 47         22.4 ~ 2 0
34 B-HiZELS NB501 37 EmG 14 33 24.2 +33 39 39         24.6 ~ 2 0
35 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
36 * 18 Peg * 22 00 07.9250290512 +06 43 02.810180604 5.31 5.88 6.00     B3III 119 0
37 [SMD2018b] SSA22-NB5-10 EmG 22 09 19.01 -00 06 16.3           ~ 1 0
38 [SMD2018b] SSA22-NB5-14 EmG 22 15 22.60 +01 31 06.7           ~ 1 0
39 SSA 22 reg 22 17 34.7 +00 15 07           ~ 351 0
40 [MSD2017] VR7 EmG 22 18 56.360 +00 08 07.32           ~ 19 0
41 [SMD2018b] SSA22-NB5-18 EmG 22 22 02.72 -00 27 19.7           ~ 1 0
42 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1

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