2014MNRAS.443.2831C

Query : 2014MNRAS.443.2831C

2014MNRAS.443.2831C - Mon. Not. R. Astron. Soc., 443, 2831-2842 (2014/October-1)

Spectroscopy of z ∼ 7 candidate galaxies: using Lyman α to constrain the neutral fraction of hydrogen in the high-redshift universe.

CARUANA J., BUNKER A.J., WILKINS S.M., STANWAY E.R., LORENZONI S., JARVIS M.J. and EBERT H.

Abstract (from CDS):

Following our previous spectroscopic observations of z > 7 galaxies with Gemini/Gemini Near Infra-Red Spectrograph (GNIRS) and Very Large Telescope (VLT)/XSHOOTER, which targeted a total of eight objects, we present here our results from a deeper and larger VLT/FOcal Reducer and Spectrograph (FORS2) spectroscopic sample of Wide Field Camera 3 selected z > 7 candidate galaxies. With our FORS2 setup we cover the 737-1070nm wavelength range, enabling a search for Lyman α in the redshift range spanning 5.06-7.80. We target 22 z-band dropouts and find no evidence of Lyman α emission, with the exception of a tentative detection (<5σ, which is our adopted criterion for a secure detection) for one object. The upper limits on Lyman α flux and the broad-band magnitudes are used to constrain the rest-frame equivalent widths for this line emission. We analyse our FORS2 observations in combination with our previous GNIRS and XSHOOTER observations, and suggest that a simple model where the fraction of high rest-frame equivalent width emitters follows the trend seen at z = 3-6.5 is inconsistent with our non-detections at z ∼ 7.8 at the 96 per cent confidence level. This may indicate that a significant neutral Hi fraction in the intergalactic medium suppresses Lyman α, with an estimated neutral fraction χ_H I∼0.5, in agreement with other estimates.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: high-redshift - galaxies: starburst - ultraviolet: galaxies

Simbad objects: 57

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Number of rows : 57
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 [GFG2013b] 21921 G 03 32 09.85 -27 43 24.0           ~ 6 0
2 [GFG2013b] 23182 G 03 32 13.39783 -27 42 31.0185           ~ 5 0
3 [BIO2015] ERSI-2160043014 EmG 03 32 16.00 -27 43 01.4         27.68 ~ 11 0
4 [BIO2011] ERSz-2225141173 G 03 32 22.52 -27 41 17.4           ~ 8 0
5 HRG14 J033222.66-274300.6 G 03 32 22.66 -27 43 00.7         27.28 ~ 18 0
6 [PVF2014] GOODS-S 20439 G 03 32 22.93 -27 44 09.9           ~ 9 0
7 [WBL2011] ERS z 87326 G 03 32 23.15 -27 42 04.7           ~ 5 0
8 ZFOURGE CDFS 27453 G 03 32 24.09 -27 42 13.9           ~ 13 0
9 GOODS-MUSIC 15047 EmG 03 32 27.88 -27 43 15.6           ~ 10 0
10 [WBL2011] ERS z 70546 G 03 32 27.9080 -27 41 04.226           ~ 4 0
11 [BIB2006] CDFS-2279641190 G 03 32 27.96 -27 41 19.0         27.63 ~ 6 0
12 JADES-GS+053.12259-27.76057 EmG 03 32 29.4096 -27 45 37.800           ~ 16 0
13 ZFOURGE CDFS 28643 G 03 32 29.4662 -27 41 32.750           ~ 5 0
14 [MDD2011] ERS 10270 G 03 32 29.50 -27 42 54.0           ~ 3 0
15 [BIO2011] ERSz-2295342044 G 03 32 29.54 -27 42 04.5           ~ 16 0
16 [BIO2015] ERSI-2296940498 G 03 32 29.69 -27 40 49.9           ~ 8 0
17 JADES-GS+053.13492-27.77271 EmG 03 32 32.37 -27 46 21.4           ~ 17 0
18 JADES-GS+053.14197-27.75523 EmG 03 32 34.06 -27 45 18.5           ~ 8 0
19 [RTG2015] 6420 G 03 32 35.236 -27 47 42.90           ~ 6 0
20 [BIO2011] ERSz-2352941047 G 03 32 35.29175 -27 41 04.7003           ~ 5 0
21 JADES-GS+053.14771-27.71537 EmG 03 32 35.44 -27 42 55.0           ~ 10 0
22 JADES-GS NC 152062 EmG 03 32 36.00 -27 44 41.7           ~ 12 0
23 GOODS-MUSIC 15172 EmG 03 32 36.2540789184 -27 43 02.827424352   22.8026 20.840 22.240 19.2468 ~ 11 0
24 [TIB2005] 325 G 03 32 36.463 -27 47 32.45           ~ 6 0
25 [BSE2004] 42806 G 03 32 36.49 -27 46 41.4           ~ 4 0
26 [BIB2006] HUDF-36777536 G 03 32 36.773 -27 47 53.59         28.98 ~ 17 0
27 JADES-GS+053.15508-27.80178 EmG 03 32 37.214 -27 48 06.13           ~ 31 0
28 [BIB2006] CDFS-2373844457 G 03 32 37.38 -27 44 46.0           ~ 5 0
29 [FPG2010] 2644 G 03 32 37.797 -27 47 40.44         29.18 ~ 6 0
30 GOODS-MUSIC 16461 G 03 32 37.953 -27 42 07.60           ~ 11 0
31 JADES-GS+053.15953-27.77152 EmG 03 32 38.282 -27 46 17.22   29.3328 30.49     ~ 28 0
32 FIGS GS1 2077 EmG 03 32 38.805 -27 47 07.15     31.6     ~ 40 0
33 [BSE2004] 49117 G 03 32 38.955 -27 46 00.47   30.4 28.01     ~ 4 0
34 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
35 GOODS J033239.06-274538.7 EmG 03 32 39.066 -27 45 38.75   30.7705 38.76     ~ 29 0
36 JADES-GS+053.16483-27.78826 EmG 03 32 39.555 -27 47 17.49   30.3455       ~ 23 0
37 [BIO2011] UDFz-41597044 G 03 32 41.597 -27 47 04.47         29.18 ~ 10 0
38 [BIB2006] CDFS-2418044023 G 03 32 41.80 -27 44 02.3           ~ 2 0
39 [BIO2011] UDFz-41826112 EmG 03 32 41.823 -27 46 11.24         29.79 ~ 14 0
40 JADES-GS+053.17582-27.77446 EmG 03 32 42.191 -27 46 27.82         28.77 ~ 22 0
41 UDF 34987 G 03 32 42.562 -27 46 56.61         28.13 ~ 44 0
42 [BIO2011] UDFz-42567314 G 03 32 42.564 -27 47 31.41           ~ 30 0
43 GLARE 3011 EmG 03 32 43.10 -27 45 17.6           ~ 6 0
44 MUSE-WIDE 154037129 EmG 03 32 43.17 -27 45 17.5           ~ 8 0
45 ZFOURGE CDFS 26466 G 03 32 43.29 -27 42 47.9           ~ 9 0
46 JADES-GS NC 127088 EmG 03 32 44.702 -27 46 44.29           ~ 24 0
47 HRG14 J033245.26-274359.6 G 03 32 45.260 -27 43 59.56           ~ 7 0
48 ZFOURGE CDFS 20879 G 03 32 45.5274 -27 45 38.274           ~ 4 0
49 [BIO2011] UDF092y-03751196 G 03 33 03.76 -27 51 19.7           ~ 11 0
50 [BIO2011] UDF092y-03781204 G 03 33 03.79 -27 51 20.4           ~ 13 0
51 QSO J1120+0641 QSO 11 20 01.463 +06 41 23.79           ~ 262 0
52 [CFP2010] NTTDF 2916 G 12 05 14.142 -07 42 08.77           ~ 3 0
53 [CFP2010] NTTDF 474 G 12 05 29.754 -07 39 51.32           ~ 3 0
54 [CFP2010] NTTDF 1632 G 12 05 32.6 -07 41 01           ~ 4 0
55 [BBZ2012] A1703-zD1 EmG 13 14 59.4183 +51 50 00.843           ~ 21 0
56 [CFP2010] BDF 5583 G 22 28 11.367 -35 12 16.52           ~ 3 0
57 [CFP2010] BDF 5665 G 22 28 12.275 -35 12 20.97           ~ 3 0

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