2011ApJ...738..136C

Query : 2011ApJ...738..136C

2011ApJ...738..136C - Astrophys. J., 738, 136 (2011/September-2)

Lyα emitting galaxies as early stages in galaxy formation.

COWIE L.L., BARGER A.J. and HU E.M.

Abstract (from CDS):

We present optical spectroscopy of two samples of Galaxy Evolution Explorer grism selected Lyα emitters (LAEs): one at z = 0.195-0.44 and the other at z = 0.65-1.25. We have also observed a comparison sample of galaxies in the same redshift intervals with the same UV magnitude distributions but with no detected Lyα. We use the optical spectroscopy to eliminate active galactic nuclei and to obtain the optical emission-line properties of the samples. We compare the luminosities of the LAEs in the two redshift intervals and show that there is dramatic evolution in the maximum Lyα luminosity over z = 0-1. Focusing on the z = 0.195-0.44 samples alone, we show that there are tightly defined relations between all of the galaxy parameters and the rest-frame equivalent width (EW) of Hα. The higher EW(Hα) sources all have lower metallicities, bluer colors, smaller sizes, and less extinction, consistent with their being in the early stages of the galaxy formation process. We find that 75%±12% of the LAEs have EW(Hα) >100 Å and, conversely, that 31%±13% of galaxies with EW(Hα) >100 Å are LAEs. We correct the broadband magnitudes for the emission-line contributions and use spectral synthesis fits to estimate the ages of the galaxies. We find a median age of 1.1x108 yr for the LAE sample and 1.4x109 yr for the UV-continuum sample without detected Lyα. The median metallicity of the LAE sample is 12 + log (O/H) = 8.24, or about 0.4 dex lower than the UV-continuum sample.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - galaxies: abundances - galaxies: distances and redshifts - galaxies: evolution - galaxies: starburst

VizieR on-line data: <Available at CDS (J/ApJ/738/136): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Table 4, col(1): [CBH2011] NNN (Nos 1-100). Tables 1-4: [CBH2010] DDD.dddddd+DD.dddddd N=61+32+8+100 added.

Simbad objects: 158

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Number of rows : 158
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 [DSB2008] 16998 EmG 00 38 04.930 -43 52 28.50           ~ 5 0
2 [CBH2010] 052.550297-28.028778 G 03 30 12.071 -28 01 43.60           ~ 1 0
3 [CBH2010] 052.551250-28.025417 G 03 30 12.300 -28 01 31.50           ~ 1 0
4 [CBH2010] 052.558125-27.801193 G 03 30 13.950 -27 48 04.29           ~ 1 0
5 [CBH2010] 052.574123-27.741528 G 03 30 17.790 -27 44 29.50           ~ 1 0
6 [CBH2010] 052.624916-27.815805 AGN 03 30 29.980 -27 48 56.90           ~ 2 0
7 [CBH2010] 052.646168-28.060139 G 03 30 35.080 -28 03 36.50           ~ 1 0
8 [CBH2010] 052.665871-27.747917 AGN 03 30 39.809 -27 44 52.50           ~ 2 0
9 DES J033042.27-273508.2 QSO 03 30 42.259 -27 35 08.20           ~ 3 0
10 [CBH2010] 052.696667-27.988028 AGN 03 30 47.200 -27 59 16.90           ~ 2 0
11 [CBH2010] 052.732166-28.067055 G 03 30 55.720 -28 04 01.40           ~ 1 0
12 [DSB2008] 3801 EmG 03 30 56.87 -28 16 47.8           ~ 7 0
13 DES J033101.16-275125.5 QSO 03 31 01.1643358656 -27 51 25.509831840           ~ 3 0
14 [CBH2010] 052.755127-27.715334 G 03 31 01.230 -27 42 55.20           ~ 1 0
15 [CBH2010] 052.760120-27.858473 EmG 03 31 02.429 -27 51 30.50           ~ 4 0
16 [CBH2010] 052.765331-27.621777 G 03 31 03.679 -27 37 18.40           ~ 1 0
17 [CBH2010] 052.790379-27.666723 G 03 31 09.691 -27 40 00.20           ~ 1 0
18 ATCDFS J033111.49-275258.6 G 03 31 11.49 -27 52 58.6           ~ 8 0
19 [CBH2010] 052.800335-27.800335 G 03 31 12.080 -27 48 01.21           ~ 1 0
20 [VV2010] J033115.0-275519 QSO 03 31 15.0478175448 -27 55 18.859833948 21.19 21.74 21.21 20.84   ~ 29 0
21 PSO J052.8365-27.9470 AGN 03 31 20.75 -27 56 49.0 21.11 20.87 20.88 20.691   ~ 14 0
22 [CBH2010] 052.849754-28.271973 AGN 03 31 23.941 -28 16 19.10           ~ 2 0
23 PSO J052.8508-27.8950 * 03 31 24.1979209343 -27 53 42.193464939           ~ 2 1
24 [CBH2010] 052.854668-27.916639 G 03 31 25.120 -27 54 59.90           ~ 1 0
25 [CBH2010] 052.862835-28.302807 G 03 31 27.080 -28 18 10.11           ~ 1 0
26 [CBH2010] 052.869667-28.283443 G 03 31 28.720 -28 17 00.39           ~ 1 0
27 [CBH2010] 052.888245-28.268251 G 03 31 33.179 -28 16 05.70           ~ 1 0
28 [CBH2010] 052.897709-28.345751 G 03 31 35.450 -28 20 44.70           ~ 1 0
29 [CBH2010] 052.930000-28.196028 G 03 31 43.200 -28 11 45.70           ~ 1 0
30 [CBH2010] 052.949291-27.402834 G 03 31 47.830 -27 24 10.20           ~ 1 0
31 [CBH2010] 052.962204-28.188999 EmG 03 31 50.929 -28 11 20.40           ~ 9 0
32 [CBH2010] 052.976501-28.238640 EmG 03 31 54.360 -28 14 19.10           ~ 6 0
33 [CBH2010] 052.978458-28.235861 G 03 31 54.830 -28 14 09.10           ~ 1 0
34 [CBH2010] 052.985916-28.158251 G 03 31 56.6552144728 -28 09 29.857473833           ~ 2 0
35 [DSB2008] 7100 EmG 03 31 59.8687199784 -28 09 53.261757252           ~ 6 0
36 [CBH2010] 053.001919-28.182611 G 03 32 00.461 -28 10 57.40           ~ 1 0
37 [CBH2010] 053.025002-28.161083 G 03 32 06.000 -28 09 39.90           ~ 1 0
38 [CBH2010] 053.045292-27.378277 G 03 32 10.870 -27 22 41.80           ~ 1 0
39 2MASS J03321178-2809116 EmG 03 32 11.78 -28 09 11.6     20.03     ~ 3 0
40 [CBH2010] 053.049873-28.025000 G 03 32 11.934 -28 01 30.13       20.130   ~ 8 0
41 [CBH2010] 053.061584-28.186527 EmG 03 32 14.780 -28 11 11.50           ~ 4 0
42 [CBH2010] 053.077999-28.222332 SyG 03 32 18.74 -28 13 21.2   20.05   18.99   ~ 7 0
43 CXOCDFS J033219.1-274445 G 03 32 19.178 -27 44 46.31 22.08 21.3104   20.550 20.5891 ~ 28 0
44 [CBH2010] 053.084042-27.573084 QSO 03 32 20.15 -27 34 24.0   21.33 21.18 21.27   ~ 5 0
45 EIS-DEEP CDFS-3 J 1 1130 * 03 32 24.6643 -27 50 51.875 22.36 21.6614     22.1053 ~ 13 0
46 [MBR2003] CDFS-H 4440 G 03 32 24.710 -27 58 38.04       20.32   ~ 3 0
47 [VV2006] J033227.0-274105 QSO 03 32 27.0132796944 -27 41 05.357500044 19.93 19.3746   19.003 19.1163 ~ 93 1
48 2XMM J033229.9-274528 Sy1 03 32 29.976 -27 45 29.77 21.66 21.1307 21.33 21.298 21.1036 ~ 80 1
49 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
50 [CBH2010] 053.126251-27.750751 G 03 32 30.300 -27 45 02.70           ~ 1 0
51 [CBH2010] 053.155334-28.177500 G 03 32 37.280 -28 10 39.00           ~ 1 0
52 DES J033237.30-280847.2 QSO 03 32 37.3023648696 -28 08 47.206029552     20.50     ~ 7 0
53 ACS-GC 90043401 Sy1 03 32 38.1232741056 -27 39 45.158278032 20.89 20.9342 20.511 20.4095 20.6297 ~ 69 0
54 [VV2006] J033239.1-274602 QSO 03 32 39.0897389184 -27 46 02.044213860 21.11 21.413 21.157 20.68 20.812 ~ 82 0
55 [CBH2010] 053.174255-28.190306 EmG 03 32 41.821 -28 11 25.10           ~ 5 0
56 DES J033244.18-281028.6 QSO 03 32 44.1894557328 -28 10 28.665292656     21.07     ~ 6 0
57 [CBH2010] 053.187252-28.375973 G 03 32 44.940 -28 22 33.50           ~ 1 0
58 ATCDFS J033246.02-282232.4 QSO 03 32 46.0288161432 -28 22 32.190324204   20.31   19.51   ~ 7 0
59 [CBH2010] 053.195126-27.787361 G 03 32 46.830 -27 47 14.50           ~ 1 0
60 [CBH2010] 053.208038-27.545000 G 03 32 49.929 -27 32 42.00           ~ 1 0
61 2MASS J03325144-2803044 G 03 32 51.4554192120 -28 03 04.498298460       17.14   ~ 7 0
62 GOODS J033253.25-274833.5 AGN 03 32 53.25005 -27 48 33.5538 22.31 21.5144 21.1015 20.594 20.8340 ~ 17 0
63 CXOCDFS J033256.8-275318 QSO 03 32 56.6570292528 -27 53 16.624989096 20.82 20.5562   19.874 20.2611 ~ 49 0
64 [MBR2003] CDFS-H 4627 G 03 32 57.120 -27 57 36.86       19.02   ~ 3 0
65 [DSB2008] 1348 EmG 03 32 57.6582082992 -28 23 18.441361896           ~ 7 0
66 [CBH2010] 053.258461-28.357668 EmG 03 33 02.031 -28 21 27.60           ~ 5 0
67 SWIRE J033304.36-281338.6 G 03 33 04.3403924160 -28 13 38.407548684           ~ 3 0
68 LEDA 750493 rG 03 33 07.24 -27 44 31.2       17.66   ~ 33 0
69 [CBH2010] 053.286755-28.333389 G 03 33 08.821 -28 20 00.20           ~ 1 0
70 [CBH2010] 053.301208-28.022917 G 03 33 12.290 -28 01 22.50           ~ 1 0
71 [DSS2017] 1712 QSO 03 33 20.0179477104 -27 59 12.631778484 21.80 21.26 21.26 20.966   ~ 16 0
72 CXOECDFS J033321.0-273911 QSO 03 33 21.0822007176 -27 39 12.027754800 20.50 20.39 20.39 20.28   ~ 19 0
73 [CBH2010] 053.340416-27.560862 G 03 33 21.700 -27 33 39.10           ~ 1 0
74 DES J033324.54-272550.6 QSO 03 33 24.5463105792 -27 25 50.685679740           ~ 5 0
75 [CBH2010] 053.359249-27.454334 EmG 03 33 26.220 -27 27 15.60           ~ 5 0
76 CXOECDFS J033328.9-275641 QSO 03 33 28.9388448360 -27 56 41.307154548 20.72 20.25 20.12 20.13   ~ 36 0
77 [VTU2006] 403 QSO 03 33 29.21 -27 59 26.5 21.40 21.37 20.95 20.776   ~ 22 0
78 DES J033332.82-282220.3 QSO 03 33 32.8224933960 -28 22 20.373638520           ~ 4 0
79 [CBH2010] 053.389584-28.376223 G 03 33 33.500 -28 22 34.40           ~ 1 0
80 [CBH2010] 053.389545-27.946222 G 03 33 33.53 -27 56 46.5   21.24 20.70 20.328   ~ 10 0
81 DES J033339.37-281724.3 QSO 03 33 39.3704534592 -28 17 24.327550104   19.99   19.72   ~ 6 0
82 [CBH2010] 053.448460-28.364695 G 03 33 47.630 -28 21 52.90           ~ 1 0
83 [CBH2010] 053.471249-28.248138 G 03 33 53.100 -28 14 53.30           ~ 1 0
84 [CBH2010] 053.489918-27.819473 G 03 33 57.580 -27 49 10.10           ~ 1 0
85 [CBH2010] 053.496414-27.966471 G 03 33 59.14 -27 57 59.4           ~ 2 0
86 DES J033404.11-275630.0 QSO 03 34 04.099 -27 56 29.90           ~ 3 0
87 SWIRE J033405.97-272926.5 G 03 34 05.9917658880 -27 29 26.540821248           ~ 2 0
88 [CBH2010] 053.530334-28.119139 AGN 03 34 07.280 -28 07 08.90           ~ 2 0
89 [DAB2009] IR 53.53403-27.90217 smm 03 34 08.17 -27 54 07.8           ~ 3 0
90 [YMD2020] DES J0334-2743 QSO 03 34 08.249 -27 43 37.81           ~ 5 0
91 [CBH2010] 053.541294-28.255499 EmG 03 34 09.911 -28 15 19.80           ~ 4 0
92 [CBH2010] 053.554749-27.880083 G 03 34 13.140 -27 52 48.30           ~ 1 0
93 [CBH2010] 053.567707-27.768970 G 03 34 16.250 -27 46 08.29           ~ 1 0
94 DES J033416.89-274504.8 QSO 03 34 16.8968157624 -27 45 04.836752208           ~ 5 0
95 [CBH2010] 053.581249-28.211390 AG? 03 34 19.5 -28 12 41           ~ 2 0
96 [DSB2008] 10526 EmG 03 34 20.821 -28 03 56.50           ~ 2 0
97 DES J033424.55-273757.5 G 03 34 24.554 -27 37 57.51           ~ 3 0
98 [CBH2010] 053.623749-27.893917 G 03 34 29.700 -27 53 38.10           ~ 1 0
99 [CBH2010] 053.662498-27.987583 G 03 34 39.000 -27 59 15.30           ~ 2 0
100 SWIRE J033450.70-274346.1 EmG 03 34 50.7018724656 -27 43 45.918537924           ~ 5 0
101 [CBH2010] 053.711498-27.876585 G 03 34 50.760 -27 52 35.71           ~ 1 0
102 [CBH2010] 053.721710-27.824833 G 03 34 53.15 -27 49 28.2           ~ 2 0
103 SWIRE J033455.08-274803.6 EmG 03 34 55.1047126776 -27 48 03.572452368           ~ 5 0
104 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
105 COSMOS2015 359225 G 09 59 29.68 +01 49 59.0 21.445 20.974 20.137 19.931 19.579 ~ 9 0
106 2QZ J095940.1+015121 EmG 09 59 40.26096 +01 51 21.5100 21.09 20.58 20.71   20.15 ~ 18 0
107 [CBH2010] 150.116043+01.951000 G 10 00 27.850 +01 57 03.60           ~ 3 0
108 COSMOS 1259183 G 10 00 35.731 +02 01 13.35 20.773 20.528 20.000 19.922 19.807 ~ 17 0
109 COSMOS 1948386 EmG 10 01 10.72 +02 20 49.1         21.11 ~ 10 0
110 COSMOS2015 309264 G 10 01 35.18 +01 45 23.0 22.027 21.858 21.430 21.489 21.385 ~ 8 0
111 COSMOS2015 834413 EmG 10 01 39.15 +02 33 48.6   21.227 21.064   20.77 ~ 9 0
112 [CBH2010] 190.041428+62.561668 G 12 40 09.943 +62 33 42.00           ~ 2 0
113 [CBH2010] 214.291290+53.086723 EmG 14 17 09.910 +53 05 12.20           ~ 8 0
114 [CBH2010] 214.430923+52.468307 G 14 17 43.33 +52 28 05.9   22.264   21.82 22.19 ~ 18 0
115 [DSB2008] 19002 EmG 14 17 45.150 +52 46 18.10           ~ 4 0
116 [CBH2010] 214.521545+52.752110 EmG 14 18 05.16832 +52 45 07.0168   20.874   20.361 20.275 ~ 8 0
117 [DSB2008] 2368 EmG 14 18 22.441 +52 18 24.29           ~ 4 0
118 [DSB2008] 2682 EmG 14 18 48.288 +52 17 57.00           ~ 7 0
119 [CBH2010] 214.728928+53.130028 G 14 18 54.943 +53 07 48.10           ~ 3 0
120 [DSB2008] 21024 EmG 14 18 55.62966 +52 49 27.7469   20.704   18.860 18.274 ~ 11 0
121 [DSB2008] 28751 EmG 14 18 55.968 +52 59 31.90           ~ 7 0
122 NVSS J141910+531600 rG 14 19 10.7285434590 +53 15 57.014238381           ~ 5 0
123 [DSB2008] 4719 EmG 14 19 14.700 +52 23 26.91           ~ 6 0
124 [DSB2008] 9045 EmG 14 19 37.731 +52 30 25.41           ~ 6 0
125 [DSB2008] 3488 EmG 14 19 52.980 +52 21 00.90           ~ 5 0
126 [DSB2008] 20285 EmG 14 20 31.699 +52 47 57.80           ~ 5 0
127 [CBH2010] 215.170456+53.114002 G 14 20 41.1805510344 +53 06 50.195443608   20.406   18.347 17.730 ~ 8 0
128 [DSB2008] 17005 EmG 14 20 43.286 +52 43 07.50           ~ 8 0
129 [DSB2008] 21404 EmG 14 20 44.692 +52 50 06.20           ~ 7 0
130 SDSS J142056.84+531307.4 rG 14 20 56.8496693952 +53 13 07.606216344   20.532   19.675 18.900 ~ 9 0
131 [DSB2008] 14069 EmG 14 21 24.657 +52 39 19.70           ~ 6 0
132 [CBH2010] 215.421539+52.359886 G 14 21 41.169 +52 21 35.59           ~ 2 0
133 [GBM2008] D3-29 G 14 21 51.160 +52 49 51.21           ~ 4 0
134 [DSB2008] 5549 EmG 14 21 54.551 +52 24 24.20           ~ 4 0
135 [CBH2010] 215.500092+53.168472 G 14 22 00.07 +53 10 06.7   20.72   19.791 19.369 ~ 4 0
136 [CBH2010] 215.533752+52.873722 Sy1 14 22 08.1 +52 52 26   19.85 19.06     ~ 6 0
137 [DSB2008] 19364 EmG 14 23 06.200 +52 46 46.91           ~ 4 0
138 [DSB2008] 17867 EmG 14 23 22.284 +52 44 32.91           ~ 4 0
139 [CBH2010] 218.718338+35.547527 G 14 34 52.401 +35 32 51.10           ~ 3 0
140 [CBH2010] 218.764587+34.821220 G 14 35 03.501 +34 49 16.39           ~ 2 0
141 [DSB2008] 28521 EmG 14 36 06.299 +35 27 30.79           ~ 4 0
142 [CBH2010] 219.086914+34.672001 G 14 36 20.859 +34 40 19.20           ~ 2 0
143 [CBH2010] 219.092041+34.942139 EmG 14 36 22.096 +34 56 32.05       19.99 19.63 ~ 5 0
144 [CBH2010] 219.100540+34.993530 EmG 14 36 23.976 +34 59 37.54       18.95 18.25 ~ 6 0
145 [KEC2012] 219.192803+35.417392 EmG 14 36 46.273 +35 25 02.61       18.19 17.32 ~ 4 0
146 [CBH2010] 219.243362+35.597694 EmG 14 36 58.3309775808 +35 35 51.572668128       17.67 17.03 ~ 5 0
147 [CBH2010] 219.281967+35.692280 EmG 14 37 07.594 +35 41 31.87       20.50 20.04 ~ 4 0
148 [KEC2012] 219.333865+34.757753 EmG 14 37 20.128 +34 45 27.91       20.24 19.96 ~ 5 0
149 [CBH2010] 219.356308+34.685585 EmG 14 37 25.466 +34 41 08.16       18.30 17.68 ~ 4 0
150 [DSB2008] 10713 EmG 14 38 59.059 +34 57 38.29           ~ 3 0
151 [CBH2010] 258.197723+60.022778 G 17 12 47.454 +60 01 22.00           ~ 2 0
152 [DSB2008] 10895 EmG 17 14 22.024 +59 50 00.00           ~ 4 0
153 [DSB2008] 14297 EmG 17 14 44.099 +59 56 50.09           ~ 3 0
154 [CBH2010] 259.178070+59.548889 G 17 16 42.737 +59 32 56.00           ~ 2 0
155 SDSS J171731.08+592915.0 rG 17 17 31.084 +59 29 15.03       18.25   ~ 9 0
156 [CBH2010] 259.465027+59.748554 G 17 17 51.606 +59 44 54.79           ~ 4 0
157 [CBH2010] 259.748260+59.825752 G 17 18 59.582 +59 49 32.71           ~ 2 0
158 [CBH2010] 261.344940+59.345528 G 17 25 22.786 +59 20 43.90           ~ 2 0

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