2009ApJ...706..762W

Query : 2009ApJ...706..762W

2009ApJ...706..762W - Astrophys. J., 706, 762-771 (2009/November-3)

Lyα-emitting galaxies at redshift z∼ 4.5 in the LALA Cetus field.

WANG J.-X., MALHOTRA S., RHOADS J.E., ZHANG H.-T. and FINKELSTEIN S.L.

Abstract (from CDS):

We present a large sample of Lyα-emitting galaxies (LAEs) spectroscopically confirmed at redshift z ~ 4.5, based on Inamori-Magellan Areal Camera and Spectrograph spectroscopic observations of candidate z~ 4.5 Lyα-emitting galaxies in the large area Lyman alpha (LALA) narrowband imaging survey Cetus field. We identify 110 of them as z ~ 4.5 Lyα emitters based on single-line detections with no continuum emission blueward of the line. Six foreground galaxies are identified, either based on multiple lines or blueward continuum emission. The Lyα confirmation rate varies from <50% to 76% for candidates selected in different narrowband filters at slightly different redshifts. We find a drop in the LAE density at redshift 4.50 ± 0.03 from redshift 4.39 to 4.47 by a factor of 66%, which could be a large-scale void in the distribution of star-forming galaxies (∼18 Mpc along the line of sight and ∼80 Mpc across). The sample includes many objects with equivalent widths (EWs) ≳200 Å. These large EW candidates are spectroscopically confirmed at the same rate as candidates with more modest EWs. A composite spectrum of all 110 confirmed LAEs shows the characteristic asymmetry of the Lyα line. It also places new and stringent upper limits on the C IV 1549 Å/Lyα and He II 1640 Å/Lyα line ratios, providing a new upper limit on the fraction of active galactic nuclei in Lyα selected galaxy samples, and on the contribution of Pop III populations. Finally, we calculate the Lyα luminosity function for our z ~ 4.5 sample, which is consistent with those at other redshifts, showing that there is no evolution in Lyα luminosity function from z = 3.1 to 6.6.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - early universe - galaxies: evolution - galaxies: formation - galaxies: high-redshift

VizieR on-line data: <Available at CDS (J/ApJ/706/762): table3.dat>

Nomenclature: Table 3: [WMR2009] JHHMMSS.s+DDMMSS N=110.

Simbad objects: 112

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Number of rows : 112
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 [WMR2009] J020413.5-044040 EmG 02 04 13.5 -04 40 40           ~ 1 0
2 [WMR2009] J020413.8-044703 EmG 02 04 13.8 -04 47 03           ~ 1 0
3 [WMR2009] J020414.3-051201 EmG 02 04 14.3 -05 12 01           ~ 1 0
4 [WMR2009] J020414.4-044411 EmG 02 04 14.4 -04 44 11           ~ 1 0
5 [WMR2009] J020414.6-045956 EmG 02 04 14.6 -04 59 56           ~ 1 0
6 LALA J020418-050748 EmG 02 04 18.1 -05 07 48           ~ 2 0
7 [WMR2009] J020424.7-043912 EmG 02 04 24.7 -04 39 12           ~ 1 0
8 LALA J020425-045610 EmG 02 04 25.4 -04 56 10           ~ 2 0
9 LALA J020425-045810 EmG 02 04 25.7 -04 58 10           ~ 2 0
10 [WMR2009] J020427.1-044736 EmG 02 04 27.1 -04 47 36           ~ 1 0
11 LALA J020427-050045 EmG 02 04 27.4 -05 00 45           ~ 2 0
12 LALA J020428-045924 EmG 02 04 28.5 -04 59 24           ~ 2 0
13 [WMR2009] J020429.1-044307 EmG 02 04 29.1 -04 43 07           ~ 1 0
14 LALA J020429-050251 EmG 02 04 29.7 -05 02 51           ~ 2 0
15 LALA J020432-050917 EmG 02 04 32.3 -05 09 17           ~ 2 0
16 LALA J020432-045519 EmG 02 04 32.3 -04 55 19           ~ 2 0
17 [WMR2009] J020432.5-044000 EmG 02 04 32.5 -04 40 00           ~ 1 0
18 [WMR2009] J020434.5-050516 EmG 02 04 34.5 -05 05 16           ~ 1 0
19 [WMR2009] J020434.6-051016 EmG 02 04 34.6 -05 10 16           ~ 1 0
20 [WMR2009] J020434.9-045703 EmG 02 04 34.9 -04 57 03           ~ 1 0
21 [WMR2009] J020438.6-044437 EmG 02 04 38.6 -04 44 37           ~ 1 0
22 [WMR2009] J020438.9-044401 EmG 02 04 38.9 -04 44 01           ~ 1 0
23 LALA J020439-051116 EmG 02 04 38.95 -05 11 16.2           ~ 3 0
24 [WMR2009] J020439.0-045233 EmG 02 04 39.0 -04 52 33           ~ 1 0
25 [WMR2009] J020441.3-044515 EmG 02 04 41.3 -04 45 15           ~ 1 0
26 [WMR2009] J020442.1-050652 EmG 02 04 42.1 -05 06 52           ~ 1 0
27 [WMR2009] J020442.7-044200 EmG 02 04 42.7 -04 42 00           ~ 1 0
28 [WMR2009] J020445.5-050008 EmG 02 04 45.5 -05 00 08           ~ 1 0
29 [WMR2009] J020446.9-050116 EmG 02 04 46.9 -05 01 16           ~ 1 0
30 [WMR2009] J020448.0-044257 EmG 02 04 48.0 -04 42 57           ~ 1 0
31 [WMR2009] J020448.3-044628 EmG 02 04 48.3 -04 46 28           ~ 1 0
32 [WMR2009] J020450.2-045828 EmG 02 04 50.2 -04 58 28           ~ 1 0
33 [WMR2009] J020450.6-050107 EmG 02 04 50.6 -05 01 07           ~ 1 0
34 [WMR2009] J020450.9-044323 EmG 02 04 50.9 -04 43 23           ~ 1 0
35 [WMR2009] J020451.3-045147 EmG 02 04 51.3 -04 51 47           ~ 1 0
36 [WMR2009] J020451.6-045737 EmG 02 04 51.6 -04 57 37           ~ 1 0
37 [WMR2009] J020452.1-043802 EmG 02 04 52.1 -04 38 02           ~ 1 0
38 [WMR2009] J020454.8-045725 EmG 02 04 54.8 -04 57 25           ~ 1 0
39 [WMR2009] J020456.6-050145 EmG 02 04 56.6 -05 01 45           ~ 1 0
40 [WMR2009] J020457.3-051157 EmG 02 04 57.3 -05 11 57           ~ 1 0
41 [WMR2009] J020457.3-043847 EmG 02 04 57.3 -04 38 47           ~ 1 0
42 [WMR2009] J020458.0-050140 EmG 02 04 58.0 -05 01 40           ~ 1 0
43 [WMR2009] J020500.1-050731 EmG 02 05 00.1 -05 07 31           ~ 1 0
44 [WMR2009] J020501.7-045639 EmG 02 05 01.7 -04 56 39           ~ 1 0
45 [WMR2009] J020503.1-044212 EmG 02 05 03.1 -04 42 12           ~ 1 0
46 [WMR2009] J020506.8-043858 EmG 02 05 06.8 -04 38 58           ~ 1 0
47 [WMR2009] J020507.2-050636 EmG 02 05 07.2 -05 06 36           ~ 1 0
48 [WMR2009] J020509.7-044005 EmG 02 05 09.7 -04 40 05           ~ 1 0
49 [WMR2009] J020510.5-044456 EmG 02 05 10.5 -04 44 56           ~ 1 0
50 [WMR2009] J020512.9-045025 EmG 02 05 12.9 -04 50 25           ~ 1 0
51 [WMR2009] J020513.2-045331 EmG 02 05 13.2 -04 53 31           ~ 1 0
52 [WMR2009] J020513.8-043833 EmG 02 05 13.8 -04 38 33           ~ 1 0
53 [WMR2009] J020513.9-044638 EmG 02 05 13.9 -04 46 38           ~ 1 0
54 [WMR2009] J020517.5-044347 EmG 02 05 17.5 -04 43 47           ~ 1 0
55 LALA J020518-045616 EmG 02 05 18.1 -04 56 16           ~ 2 0
56 [WMR2009] J020519.2-044902 EmG 02 05 19.2 -04 49 02           ~ 1 0
57 NAME Cetus Field reg 02 05 20 -04 55.0           ~ 28 0
58 [WMR2009] J020524.5-045241 EmG 02 05 24.5 -04 52 41           ~ 1 0
59 [WMR2009] J020525.1-044552 EmG 02 05 25.1 -04 45 52           ~ 1 0
60 [WMR2009] J020525.1-044515 EmG 02 05 25.1 -04 45 15           ~ 1 0
61 [WMR2009] J020525.2-050048 EmG 02 05 25.2 -05 00 48           ~ 1 0
62 LALA J020525-045927 EmG 02 05 25.7 -04 59 27           ~ 2 0
63 [WMR2009] J020526.2-050724 EmG 02 05 26.2 -05 07 24           ~ 1 0
64 [WMR2009] J020526.5-050310 EmG 02 05 26.5 -05 03 10           ~ 1 0
65 [WMR2009] J020527.7-043944 EmG 02 05 27.7 -04 39 44           ~ 1 0
66 [WMR2009] J020531.2-044704 EmG 02 05 31.2 -04 47 04           ~ 1 0
67 [WMR2009] J020531.4-044053 EmG 02 05 31.4 -04 40 53           ~ 1 0
68 [WMR2009] J020533.0-050042 EmG 02 05 33.0 -05 00 42           ~ 1 0
69 [WMR2009] J020534.6-044322 EmG 02 05 34.6 -04 43 22           ~ 1 0
70 [WMR2009] J020534.7-051205 EmG 02 05 34.7 -05 12 05           ~ 1 0
71 [WMR2009] J020535.6-044430 EmG 02 05 35.6 -04 44 30           ~ 1 0
72 [WMR2009] J020536.3-044822 EmG 02 05 36.3 -04 48 22           ~ 1 0
73 [WMR2009] J020536.4-050751 EmG 02 05 36.4 -05 07 51           ~ 1 0
74 [WMR2009] J020536.6-045520 EmG 02 05 36.6 -04 55 20           ~ 1 0
75 [WMR2009] J020542.1-050520 EmG 02 05 42.1 -05 05 20           ~ 1 0
76 [WMR2009] J020544.1-045049 EmG 02 05 44.1 -04 50 49           ~ 1 0
77 [WMR2009] J020544.7-045921 EmG 02 05 44.7 -04 59 21           ~ 1 0
78 [WMR2009] J020547.0-045744 EmG 02 05 47.0 -04 57 44           ~ 1 0
79 [WMR2009] J020550.6-045005 EmG 02 05 50.6 -04 50 05           ~ 1 0
80 [WMR2009] J020554.3-044147 EmG 02 05 54.3 -04 41 47           ~ 1 0
81 [WMR2009] J020556.5-050917 EmG 02 05 56.5 -05 09 17           ~ 1 0
82 [WMR2009] J020556.7-045854 EmG 02 05 56.7 -04 58 54           ~ 1 0
83 [WMR2009] J020557.5-045107 EmG 02 05 57.5 -04 51 07           ~ 1 0
84 [WMR2009] J020557.6-043614 EmG 02 05 57.6 -04 36 14           ~ 1 0
85 [WMR2009] J020557.7-051003 EmG 02 05 57.7 -05 10 03           ~ 1 0
86 [WMR2009] J020601.7-050258 EmG 02 06 01.7 -05 02 58           ~ 1 0
87 [WMR2009] J020602.0-045633 EmG 02 06 02.0 -04 56 33           ~ 1 0
88 [WMR2009] J020603.5-050019 EmG 02 06 03.5 -05 00 19           ~ 1 0
89 [WMR2009] J020603.5-045637 EmG 02 06 03.5 -04 56 37           ~ 1 0
90 [WMR2009] J020603.8-044905 EmG 02 06 03.8 -04 49 05           ~ 1 0
91 [WMR2009] J020604.1-050752 EmG 02 06 04.1 -05 07 52           ~ 1 0
92 [WMR2009] J020606.9-045021 EmG 02 06 06.9 -04 50 21           ~ 1 0
93 [WMR2009] J020608.0-044623 EmG 02 06 08.0 -04 46 23           ~ 1 0
94 [WMR2009] J020611.1-044601 EmG 02 06 11.1 -04 46 01           ~ 1 0
95 [WMR2009] J020612.3-045608 EmG 02 06 12.3 -04 56 08           ~ 1 0
96 [WMR2009] J020612.3-045347 EmG 02 06 12.3 -04 53 47           ~ 1 0
97 [WMR2009] J020612.4-045643 EmG 02 06 12.4 -04 56 43           ~ 1 0
98 [WMR2009] J020613.1-045101 EmG 02 06 13.1 -04 51 01           ~ 1 0
99 [WMR2009] J020614.0-043652 EmG 02 06 14.0 -04 36 52           ~ 1 0
100 LALA J020614-050032 EmG 02 06 14.1 -05 00 32           ~ 2 0
101 [WMR2009] J020614.4-050523 EmG 02 06 14.4 -05 05 23           ~ 1 0
102 [WMR2009] J020615.9-050555 EmG 02 06 15.9 -05 05 55           ~ 1 0
103 [WMR2009] J020616.2-050315 EmG 02 06 16.2 -05 03 15           ~ 1 0
104 [WMR2009] J020616.5-045457 EmG 02 06 16.5 -04 54 57           ~ 1 0
105 [WMR2009] J020617.0-045438 EmG 02 06 17.0 -04 54 38           ~ 1 0
106 [WMR2009] J020617.0-044833 EmG 02 06 17.0 -04 48 33           ~ 1 0
107 [WMR2009] J020618.2-043851 EmG 02 06 18.2 -04 38 51           ~ 1 0
108 [WMR2009] J020618.2-045024 EmG 02 06 18.2 -04 50 24           ~ 1 0
109 [WMR2009] J020623.1-044851 EmG 02 06 23.1 -04 48 51           ~ 1 0
110 [WMR2009] J020623.8-044221 EmG 02 06 23.8 -04 42 21           ~ 1 0
111 [WMR2009] J020628.0-045307 EmG 02 06 28.0 -04 53 07           ~ 1 0
112 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0

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