2011ApJ...736...18N

Query : 2011ApJ...736...18N

2011ApJ...736...18N - Astrophys. J., 736, 18 (2011/July-3)

Narrowband imaging of escaping lyman-continuum emission in the SSA22 field.

NESTOR D.B., SHAPLEY A.E., STEIDEL C.C. and SIANA B.

Abstract (from CDS):

We present the results of an ultradeep, narrowband imaging survey for Lyman-continuum (LyC) emission at z ∼ 3 in the SSA22a field. We employ a custom narrowband filter centered at λ = 3640 Å (NB3640), which probes the LyC region for galaxies at z ≥ 3.06. We also analyze new and archival NB4980 imaging tuned to the wavelength of the Lyα emission line at z = 3.09, and archival broadband B, V, and R images of the non-ionizing UV continuum. Our NB3640 images contain 26 z ≥ 3.06 Lyman break galaxies (LBGs) as well as a set of 130 Lyα emitters (LAEs), identified by their excess NB4980 flux relative to the BV continuum. Six LBGs and 28 LAEs are detected in the NB3640 image. LBGs appear to span a range of NB3640-R colors, while LAEs appear bimodal in their NB3640-R properties. We estimate average UV-to-LyC flux density ratios, corrected for foreground contamination and intergalactic medium absorption, finding UV/FLyC>LBGcorr = 11.3+10.3_- 5.4_, which implies an LBG LyC escape fraction f LyCesc ∼ 0.1, and UV/FLyC>LAEcorr= 2.2+0.9_- 0.6_. The strikingly blue LAE flux density ratios defy interpretation in terms of standard stellar population models. Assuming UV/FLyC>LBGcorr applies down to L = 0.1L*, we estimate a galaxy contribution to the intergalactic hydrogen ionization rate that is consistent with independent estimates based on the Lyα forest opacity at z ≃ 3. If we assume that UV/FLyC>LAE corr holds at the faintest luminosities, the galaxy contribution significantly exceeds that inferred from the Lyα forest. We interpret our results in terms of a model where LyC photons escape over only ∼10%-20% of solid angle. When advantageously oriented, a galaxy will exhibit a low UV-to-LyC ratio, an effect enhanced for more compact galaxies. This model, however, does not adequately explain the extremely blue NB3640-R colors measured for some LAEs in our sample. Further follow-up study of these faint LAEs is crucial, given the potentially important contribution similar objects make to the process of reionization.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - diffuse radiation - galaxies: high-redshift - intergalactic medium

VizieR on-line data: <Available at CDS (J/ApJ/736/18): table4.dat table5.dat table9.dat table10.dat>

Nomenclature: Tables 5+10: [NSS2011] NNN (Nos 1-130).

Simbad objects: 154

goto Full paper

goto View the references in ADS

Number of rows : 154
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 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
2 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
3 [NSS2011] 90 EmG 22 17 18.25 +00 14 06.4       27.00   ~ 2 0
4 [NSS2011] 68 EmG 22 17 18.37 +00 17 26.1       27.00   ~ 2 0
5 SAS-LBG SSA22a-C48 G 22 17 18.60 +00 18 16.2       24.57   ~ 6 0
6 [YMK2012] LAE J221718.8+001518 EmG 22 17 18.77 +00 15 18.1       27.00   ~ 4 0
7 SAS-LBG SSA22a-D17 G 22 17 18.87 +00 18 16.8       24.29   ~ 13 0
8 SAS-LBG SSA22a-C24 G 22 17 18.93 +00 14 45.6       24.19   ~ 5 0
9 [NSS2011] 69 EmG 22 17 18.96 +00 11 12.0       24.62   ~ 3 0
10 [YMK2012] LAE J221719.0+001200 EmG 22 17 18.96 +00 12 00.8       26.59   ~ 3 0
11 [YMK2012] LAE J221719.3+001450 EmG 22 17 19.25 +00 14 50.9       25.82   ~ 4 0
12 SAS-LBG SSA22a-C30 G 22 17 19.28 +00 15 44.7       23.70   ~ 9 0
13 [NSS2011] 103 EmG 22 17 19.40 +00 15 26.1       27.00   ~ 2 0
14 [NSS2011] 110 EmG 22 17 19.50 +00 15 57.6       27.00   ~ 2 0
15 [NSS2011] 126 EmG 22 17 19.53 +00 16 48.2       27.00   ~ 2 0
16 [NSS2011] 58 EmG 22 17 19.61 +00 15 38.4       27.00   ~ 2 0
17 [YMK2012] LAE J221719.7+001149 EmG 22 17 19.68 +00 11 49.4       26.11   ~ 3 0
18 SAS-LBG SSA22a-C49 G 22 17 19.80 +00 18 19.0       23.81   ~ 14 0
19 [NSS2011] 84 EmG 22 17 19.90 +00 15 14.9       27.00   ~ 2 0
20 SAS-LBG SSA22a-C35 G 22 17 20.22 +00 16 52.3       24.06   ~ 10 0
21 SAS-LBG SSA22a-C47 EmO 22 17 20.33 +00 17 32.1       23.78   ~ 16 0
22 [NSS2011] 10 EmG 22 17 20.38 +00 18 04.2       25.77   ~ 3 0
23 [LAC2009] 58 EmG 22 17 20.67 +00 15 13.2       27.00   ~ 5 0
24 [NSS2011] 66 EmG 22 17 20.86 +00 15 11.8       26.64   ~ 3 0
25 [NSS2011] 107 EmG 22 17 20.96 +00 14 46.7       26.57   ~ 2 0
26 [NSS2011] 37 EmG 22 17 20.96 +00 18 07.3       25.61   ~ 2 0
27 SAS-LBG SSA22a-C39 G 22 17 20.98 +00 17 09.4       25.04   ~ 8 0
28 SAS-LBG SSA22a-C28 EmG 22 17 21.11 +00 15 28.0       24.87   ~ 5 0
29 [NSS2011] 46 EmG 22 17 21.47 +00 14 54.6       27.00   ~ 4 0
30 [NSS2011] 42 EmG 22 17 21.50 +00 17 04.7       25.50   ~ 3 0
31 [NSS2011] 71 EmG 22 17 21.61 +00 12 20.5       26.77   ~ 2 0
32 [YMK2012] LAE J221721.7+001223 EmG 22 17 21.65 +00 12 23.4       26.24   ~ 3 0
33 [NSS2011] 30 EmG 22 17 21.75 +00 11 38.8       27.00   ~ 2 0
34 [NSS2011] 15 EmG 22 17 21.84 +00 12 12.7       27.00   ~ 2 0
35 [NSS2011] 36 EmG 22 17 22.25 +00 11 55.1       27.00   ~ 2 0
36 [NSS2011] 129 EmG 22 17 22.28 +00 10 57.9       27.00   ~ 2 0
37 [NSS2011] 56 EmG 22 17 22.42 +00 17 20.7       26.86   ~ 2 0
38 [NSS2011] 124 EmG 22 17 22.80 +00 17 48.7       27.00   ~ 2 0
39 [NSS2011] 106 EmG 22 17 22.86 +00 17 57.8       26.16   ~ 2 0
40 [YMK2012] LAE J221722.9+001441 EmG 22 17 22.87 +00 14 41.7       26.53   ~ 4 0
41 [NSS2011] 75 EmG 22 17 22.97 +00 11 25.8       27.00   ~ 2 0
42 [NSS2011] 63 EmG 22 17 23.32 +00 15 52.9       26.55   ~ 3 0
43 [NSS2011] 34 EmG 22 17 23.41 +00 16 35.4       25.42   ~ 2 0
44 [NSS2011] 128 EmG 22 17 23.43 +00 16 07.4       27.00   ~ 2 0
45 SAS-LBG SSA22a-MD32 G 22 17 23.70 +00 16 01.0   25.70 25.12 25.17   ~ 6 0
46 [NSS2011] 92 EmG 22 17 23.97 +00 15 27.8       27.00   ~ 2 0
47 [NSS2011] 109 EmG 22 17 23.98 +00 17 57.8       26.77   ~ 2 0
48 [NSS2011] 102 EmG 22 17 24.00 +00 16 27.6       25.91   ~ 2 0
49 [NSS2011] 98 EmG 22 17 24.01 +00 13 19.5       27.00   ~ 2 0
50 [NSS2011] 39 EmG 22 17 24.08 +00 11 31.7       26.48   ~ 3 0
51 [NSS2011] 41 EmG 22 17 24.54 +00 15 06.7       25.97   ~ 3 0
52 [YMK2012] LAE J221724.6+001557 EmG 22 17 24.56 +00 15 56.8       27.00   ~ 3 0
53 [NSS2011] 108 EmG 22 17 24.78 +00 17 40.4       26.84   ~ 2 0
54 [MYH2004] LAB 35 EmG 22 17 24.79 +00 17 17.4       25.51   ~ 19 0
55 [AMH2017] VLA-LAB16 EmG 22 17 24.80 +00 11 16.8       27.00   ~ 17 0
56 [NSS2011] 113 EmG 22 17 24.80 +00 13 26.9       27.00   ~ 2 0
57 [NSS2011] 27 EmG 22 17 24.94 +00 17 17.3       26.25   ~ 2 0
58 [NSS2011] 59 EmG 22 17 24.98 +00 12 30.0       25.31   ~ 2 0
59 [NSS2011] 101 EmG 22 17 25.33 +00 17 22.5       26.89   ~ 2 0
60 [NSS2011] 57 EmG 22 17 25.40 +00 10 58.3       26.84   ~ 2 0
61 [MII2017b] AGN9 AGN 22 17 25.40 +00 17 16.8     26.267 25.907   ~ 8 0
62 SAS-LBG SSA22a-C32 G 22 17 25.61 +00 16 13.0       23.64   ~ 7 0
63 [NSS2011] 119 EmG 22 17 25.63 +00 12 47.8       27.00   ~ 2 0
64 NAME SMM J221726+0013 EmO 22 17 25.97 +00 12 38.9   27   24.49   ~ 112 0
65 SAS-LBG SSA22a-C15 EmO 22 17 26.12 +00 12 55.3       25.02   ~ 25 0
66 [NSS2011] 19 EmG 22 17 26.15 +00 13 20.1       25.70   ~ 2 0
67 [NSS2011] 121 EmG 22 17 26.44 +00 15 27.5       27.00   ~ 2 0
68 [NSS2011] 32 EmG 22 17 26.61 +00 13 18.1       26.61   ~ 2 0
69 [NSS2011] 120 EmG 22 17 26.76 +00 10 59.8       27.00   ~ 2 0
70 SAS-LBG SSA22a-M10 G 22 17 26.79 +00 12 21.1       24.50   ~ 5 0
71 [NSS2011] 35 EmG 22 17 27.03 +00 13 13.2       27.00   ~ 2 0
72 [NSS2011] 97 EmG 22 17 27.11 +00 14 08.7       27.00   ~ 2 0
73 [YMK2012] LAE J221727.2+001622 EmG 22 17 27.18 +00 16 21.7       25.98   ~ 4 0
74 [SAD98] SSA 22a MD31 G 22 17 27.30 +00 18 09.5   24.33 23.60 23.56   ~ 14 0
75 [NSS2011] 48 EmG 22 17 27.37 +00 16 51.5       26.73   ~ 3 0
76 [NSS2011] 93 EmG 22 17 27.48 +00 13 57.5       26.35   ~ 2 0
77 [YMK2012] LAE J221727.8+001737 EmG 22 17 27.78 +00 17 36.9       27.00   ~ 5 0
78 [NSS2011] 116 EmG 22 17 28.00 +00 12 14.2       27.00   ~ 2 0
79 [NSS2011] 4 EmG 22 17 28.01 +00 14 30.0       24.34   ~ 7 0
80 [NSS2011] 65 EmG 22 17 28.15 +00 14 36.4       26.91   ~ 2 0
81 [NSS2011] 60 EmG 22 17 28.19 +00 11 17.1       26.61   ~ 2 0
82 [YMK2012] LAE J221728.3+001212 EmG 22 17 28.29 +00 12 12.3       25.84   ~ 7 0
83 [NSS2011] 86 EmG 22 17 28.42 +00 13 42.8       27.00   ~ 2 0
84 [NSS2011] 83 EmG 22 17 28.46 +00 12 08.9       26.46   ~ 2 0
85 [NSS2011] 81 EmG 22 17 29.22 +00 14 48.7       27.00   ~ 3 0
86 [NSS2011] 100 EmG 22 17 30.61 +00 18 11.6       27.00   ~ 2 0
87 [NSS2011] 85 EmG 22 17 30.86 +00 14 38.2       26.94   ~ 2 0
88 SAS-LBG SSA22a-aug96M16 G 22 17 30.90 +00 13 10.7       23.83   ~ 10 0
89 [NSS2011] 111 EmG 22 17 31.14 +00 16 42.9       27.00   ~ 3 0
90 [NSS2011] 72 EmG 22 17 31.24 +00 17 32.1       27.00   ~ 4 0
91 SAS-LBG SSA22a-M13 EmG 22 17 31.49 +00 12 55.0       25.38   ~ 4 0
92 SAS-LBG SSA22a-M28 EmG 22 17 31.69 +00 16 57.6       24.75   ~ 25 0
93 [NSS2011] 23 EmG 22 17 31.73 +00 16 06.9       24.91   ~ 4 0
94 [NSS2011] 28 EmG 22 17 31.80 +00 17 17.9       25.50   ~ 4 0
95 [NSS2011] 40 EmG 22 17 31.93 +00 13 08.5       27.00   ~ 2 0
96 SAS-LBG SSA22a-C16 EmO 22 17 31.96 +00 13 16.1       23.62   ~ 25 0
97 SAS-LBG SSA22a-D3 EmG 22 17 32.40 +00 11 34.1       23.92   ~ 37 0
98 [NSS2011] 112 EmG 22 17 32.72 +00 15 54.2       27.00   ~ 3 0
99 [NSS2011] 130 EmG 22 17 32.84 +00 16 48.8       27.00   ~ 3 0
100 [NSS2011] 115 EmG 22 17 33.46 +00 17 01.2       27.00   ~ 3 0
101 [NSS2011] 31 EmG 22 17 33.63 +00 17 15.1       26.37   ~ 3 0
102 [NSS2011] 51 EmG 22 17 33.72 +00 15 04.9       26.26   ~ 3 0
103 [YMK2012] LAE J221733.9+001215 EmG 22 17 33.85 +00 12 14.9       26.07   ~ 3 0
104 [NSS2011] 61 EmG 22 17 34.10 +00 15 40.2       27.00   ~ 3 0
105 [NSS2011] 24 EmG 22 17 34.17 +00 16 09.7       26.73   ~ 3 0
106 [NSS2011] 114 EmG 22 17 34.50 +00 14 20.0       27.00   ~ 2 0
107 [NSS2011] 79 EmG 22 17 34.68 +00 11 10.5       27.00   ~ 2 0
108 SSA 22 reg 22 17 34.7 +00 15 07           ~ 351 0
109 [NSS2011] 53 EmG 22 17 34.70 +00 16 33.4       26.53   ~ 4 0
110 [NSS2011] 38 EmG 22 17 34.80 +00 15 41.2   26.03 25.66 25.50   ~ 4 0
111 [NSS2011] 123 EmG 22 17 35.06 +00 17 26.0       27.00   ~ 2 0
112 [NSS2011] 118 EmG 22 17 35.28 +00 10 59.9       26.20   ~ 2 0
113 SAS-LBG SSA22a-C12 EmO 22 17 35.30 +00 12 49.0       24.22   ~ 16 0
114 [NSS2011] 64 EmG 22 17 35.42 +00 12 14.6       26.05   ~ 3 0
115 [NSS2011] 82 EmG 22 17 35.44 +00 16 47.6       27.00   ~ 4 0
116 [NSS2011] 105 EmG 22 17 35.46 +00 12 23.9       26.81   ~ 2 0
117 [NSS2011] 16 EmG 22 17 35.61 +00 18 00.2       26.24   ~ 4 0
118 [NSS2011] 55 EmG 22 17 35.80 +00 11 50.0       26.67   ~ 2 0
119 NAME SMM J221735.84+001558.9 rG 22 17 35.86 +00 15 59.4   27.332 25.881 25.468 24.57 ~ 41 0
120 [NSS2011] 80 EmG 22 17 35.95 +00 13 43.3       27.00   ~ 2 0
121 [NSS2011] 45 EmG 22 17 35.97 +00 16 30.2       27.00   ~ 3 0
122 [NSS2011] 47 EmG 22 17 36.05 +00 15 06.9       27.00   ~ 2 0
123 [NSS2011] 91 EmG 22 17 36.14 +00 15 40.7       27.00   ~ 3 0
124 [NSS2011] 67 EmG 22 17 36.26 +00 13 11.7       26.40   ~ 3 0
125 [YMK2012] LAE J221736.4+001251 EmG 22 17 36.41 +00 12 51.0       27.00   ~ 3 0
126 [NSS2011] 99 EmG 22 17 36.46 +00 13 00.3       27.00   ~ 2 0
127 [NSS2011] 74 EmG 22 17 36.47 +00 12 54.8       26.16   ~ 3 0
128 [NSS2011] 25 EmG 22 17 36.74 +00 16 28.8       25.54   ~ 4 0
129 [NSS2011] 52 EmG 22 17 36.84 +00 13 17.2       26.63   ~ 2 0
130 [NSS2011] 127 EmG 22 17 36.91 +00 11 27.1       27.00   ~ 2 0
131 [NSS2011] 87 EmG 22 17 37.07 +00 13 21.5       27.00   ~ 2 0
132 [NSS2011] 95 EmG 22 17 37.19 +00 13 28.0       26.17   ~ 2 0
133 [NSS2011] 20 EmG 22 17 37.33 +00 16 31.4       25.45   ~ 4 0
134 [NSS2011] 33 EmG 22 17 37.50 +00 14 08.3       26.62   ~ 2 0
135 [NSS2011] 104 EmG 22 17 37.66 +00 12 55.5       27.00   ~ 2 0
136 SAS-LBG SSA22a-C50 G 22 17 37.66 +00 18 20.9       25.01   ~ 8 0
137 [NSS2011] 78 EmG 22 17 37.68 +00 16 48.3       25.95   ~ 4 0
138 SAS-LBG SSA22a-MD14 G 22 17 37.95 +00 13 43.6   25.46 24.66 24.38   ~ 9 0
139 [NSS2011] 77 EmG 22 17 37.95 +00 11 01.3       26.01   ~ 2 0
140 [NSS2011] 125 EmG 22 17 38.02 +00 14 03.6       26.79   ~ 2 0
141 [NSS2011] 122 EmG 22 17 38.19 +00 14 03.7       27.00   ~ 2 0
142 [NSS2011] 88 EmG 22 17 38.45 +00 13 18.3       27.00   ~ 2 0
143 [NSS2011] 89 EmG 22 17 38.54 +00 15 22.5       26.59   ~ 2 0
144 SAS-LBG SSA22a-C4 EmG 22 17 38.90 +00 11 01.8       24.28   ~ 9 0
145 [NSS2011] 96 EmG 22 17 38.93 +00 11 37.4       26.64   ~ 2 0
146 [IKI2011] b EmG 22 17 39.01 +00 17 26.4   26.01 25.82 25.82   ~ 6 0
147 [NSS2011] 54 EmG 22 17 39.05 +00 11 33.9       26.25   ~ 2 0
148 [NSS2011] 117 EmG 22 17 39.08 +00 12 01.9       27.00   ~ 2 0
149 CXOU J221739.1+001331 AGN 22 17 39.0840 +00 13 29.784   25.999 24.878 25.086   ~ 64 1
150 [NSS2011] 73 EmG 22 17 39.12 +00 17 11.7       26.35   ~ 2 0
151 [NSS2011] 94 EmG 22 17 39.14 +00 17 00.6       27.00   ~ 2 0
152 [NSS2011] 70 EmG 22 17 39.28 +00 14 00.2       25.98   ~ 2 0
153 [YMK2012] LAE J221739.3+001610 EmG 22 17 39.29 +00 16 10.5       27.00   ~ 3 0
154 SAS-LBG SSA22a-C26 G 22 17 39.54 +00 15 15.4       25.01   ~ 5 0

To bookmark this query, right click on this link: simbad:objects in 2011ApJ...736...18N and select 'bookmark this link' or equivalent in the popup menu