2011ApJ...734..119K

Query : 2011ApJ...734..119K

2011ApJ...734..119K - Astrophys. J., 734, 119 (2011/June-3)

Completing the census of Lyα emitters at the reionization epoch.

KASHIKAWA N., SHIMASAKU K., MATSUDA Y., EGAMI E., JIANG L., NAGAO T., OUCHI M., MALKAN M.A., HATTORI T., OTA K., TANIGUCHI Y., OKAMURA S., LY C., IYE M., FURUSAWA H., SHIOYA Y., SHIBUYA T., ISHIZAKI Y. and TOSHIKAWA J.

Abstract (from CDS):

We carried out extended spectroscopic confirmations of Lyα emitters (LAEs) at z = 6.5 and 5.7 in the Subaru Deep Field. Now, the total number of spectroscopically confirmed LAEs is 45 and 54 at z = 6.5 and 5.7, respectively, and at least 81% (70%) of our photometric candidates at z = 6.5 (5.7) have been spectroscopically identified as real LAEs. We made careful measurements of the Lyα luminosity, both photometrically and spectroscopically, to accurately determine the Lyα and rest-UV luminosity functions (LFs). The substantially improved evaluation of the Lyα LF at z = 6.5 shows an apparent deficit from z = 5.7 at least at the bright end, and a possible decline even at the faint end, though small uncertainties remain. The rest-UV LFs at z = 6.5 and 5.7 are in good agreement, at least at the bright end, in clear contrast to the differences seen in the Lyα LF. These results imply an increase in the neutral fraction of the intergalactic medium from z = 5.7 to 6.5. The rest-frame equivalent width (EW0) distribution at z = 6.5 seems to be systematically smaller than z = 5.7, and it shows an extended tail toward larger EW0. The bright end of the rest-UV LF can be reproduced from the observed Lyα LF and a reasonable EW0-UV luminosity relation. Integrating this rest-UV LF provides the first measurement of the contribution of LAEs to the photon budget required for reionization. The derived UV LF suggests that the fractional contribution of LAEs to the photon budget among Lyman break galaxies significantly increases toward faint magnitudes. Low-luminosity LAEs could dominate the ionizing photon budget, though this inference depends strongly on the uncertain faint-end slope of the Lyα LF.

Abstract Copyright: ∼

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

Nomenclature: Table 2: [TAN2005] NN (Nos 60-61) added. Table 3, col(1): [SKD2006] NNNNNN N=20 among (Nos 34549-138624) added = Table 3, col(2): [KSM2011] SDF JHHMMSS.s+DDMMSS N=20.

Simbad objects: 53

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Number of rows : 53
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 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
2 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 439 0
3 [TAN2005] SDF J132338.6+272940 EmG 13 23 38.6 +27 29 40           ~ 3 0
4 [SKD2006] 120018 EmG 13 23 40.6 +27 34 47           ~ 1 0
5 [TAN2005] SDF J132342.2+272644 EmG 13 23 42.2 +27 26 44           ~ 2 0
6 [TAN2005] 24 EmG 13 23 43.190 +27 24 52.04           ~ 5 0
7 [SKD2006] 71751 EmG 13 23 44.747 +27 24 26.81           ~ 5 0
8 [TAN2005] 61 EmG 13 23 44.896 +27 31 44.90           ~ 4 0
9 [SKD2006] 70773 EmG 13 23 47.120 +27 24 13.82           ~ 2 0
10 [TAN2005] 25 EmG 13 23 47.710 +27 23 59.63           ~ 3 0
11 [TAN2005] 26 EmG 13 23 48.922 +27 15 30.33           ~ 4 0
12 [TAN2005] 27 EmG 13 23 49.186 +27 32 11.39           ~ 3 0
13 [SKD2006] 124905 EmG 13 23 52.9 +27 35 49           ~ 1 0
14 [SKD2006] 138624 EmG 13 23 57.4 +27 38 36           ~ 1 0
15 [TAN2005] 10 EmG 13 24 06.5 +27 16 34           ~ 3 0
16 [SKD2006] 91179 EmG 13 24 17.84 +27 28 33.4           ~ 2 0
17 [TAN2005] 12 EmG 13 24 17.909 +27 17 45.94           ~ 5 0
18 [SKD2006] 34549 EmG 13 24 18.082 +27 16 38.93           ~ 2 0
19 [TAN2005] 34 EmG 13 24 19.326 +27 41 24.82           ~ 3 0
20 [SKD2006] 62511 EmG 13 24 19.6 +27 22 28           ~ 1 0
21 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 330 1
22 [TAN2005] SDF J132422.6+274459 EmG 13 24 22.6 +27 44 59           ~ 2 0
23 [SKD2006] 89624 EmG 13 24 24.80 +27 28 11.9           ~ 2 0
24 [SKD2006] 98461 EmG 13 24 28.313 +27 30 12.17           ~ 2 0
25 [TAN2005] 13 EmG 13 24 28.652 +27 30 49.24           ~ 3 0
26 [SKD2006] 98040 EmG 13 24 32.885 +27 30 08.82           ~ 5 0
27 [TAN2005] 40 EmG 13 24 34.284 +27 40 56.32           ~ 3 0
28 [TAN2005] SDF J132435.0+273957 EmG 13 24 35.005 +27 39 57.43           ~ 5 0
29 [SKD2006] 36849 EmG 13 24 35.8 +27 17 09           ~ 1 0
30 [TAN2005] SDF J132436.6+272223 EmG 13 24 36.6 +27 22 23           ~ 2 0
31 [SKD2006] 65899 EmG 13 24 38.0 +27 23 15           ~ 1 0
32 [TAN2005] 43 EmG 13 24 40.239 +27 25 53.11           ~ 5 0
33 [SKD2006] 83092 EmG 13 24 41.264 +27 26 49.09           ~ 4 0
34 [TAN2005] 44 EmG 13 24 43.427 +27 26 32.62           ~ 5 0
35 [TAN2005] SDF J132444.4+273942 EmG 13 24 44.4 +27 39 42           ~ 2 0
36 [TAN2005] SDF J132445.6+273033 EmG 13 24 45.6 +27 30 33           ~ 2 0
37 [SKD2006] 75550 EmG 13 24 47.7 +27 25 12           ~ 1 0
38 [TAN2005] SDF J132450.7+272200 EmG 13 24 50.7 +27 22 00           ~ 2 0
39 [SKD2006] 138608 EmG 13 24 50.9 +27 38 39           ~ 1 0
40 [SKD2006] 81382 EmG 13 24 51.4 +27 26 26           ~ 1 0
41 [TAN2005] SDF J132455.4+271314 EmG 13 24 55.4 +27 13 14           ~ 2 0
42 [TAN2005] 51 EmG 13 24 55.772 +27 40 15.31           ~ 5 0
43 [SKD2006] 61394 EmG 13 24 56.5 +27 22 12           ~ 1 0
44 [TAN2005] SDF J132458.0+272349 EmG 13 24 58.0 +27 23 49           ~ 5 0
45 [TAN2005] SDF J132500.9+272030 EmG 13 25 00.9 +27 20 30           ~ 2 0
46 [TAN2005] SDF J132516.7+272236 EmG 13 25 16.7 +27 22 36           ~ 2 0
47 [SKD2006] 45159 EmG 13 25 20.192 +27 18 42.27           ~ 2 0
48 [TAN2005] SDF J132521.1+272712 EmG 13 25 21.1 +27 27 12           ~ 2 0
49 [TAN2005] 60 EmG 13 25 23.326 +27 16 12.44           ~ 2 0
50 [TAN2005] SDF J132528.0+271328 EmG 13 25 28.0 +27 13 28           ~ 2 0
51 [SKD2006] 66162 EmG 13 25 28.8 +27 23 17           ~ 1 0
52 [TAN2005] SDF J132447.7+271106 EmG 13 25 33.9 +27 13 01           ~ 2 1
53 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0

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