2011ApJ...743...65J

Query : 2011ApJ...743...65J

2011ApJ...743...65J - Astrophys. J., 743, 65 (2011/December-2)

Keck spectroscopy of lyman-break galaxies and its implications for the UV-continuum and Lyα luminosity functions at z > 6.

JIANG L., EGAMI E., KASHIKAWA N., WALTH G., MATSUDA Y., SHIMASAKU K., NAGAO T., OTA K. and OUCHI M.

Abstract (from CDS):

We present Keck spectroscopic observations of z > 6 Lyman-break galaxy (LBG) candidates in the Subaru Deep Field (SDF). The candidates were selected as i'-dropout objects down to z' = 27 AB magnitudes from an ultra-deep SDF z'-band image. With the Keck spectroscopy we identified 19 LBGs with prominent Lyα emission lines at 6 ≤ z ≤ 6.4. The median value of the Lyα rest-frame equivalent widths (EWs) is ∼50 Å, with four EWs >100 Å. This well-defined spectroscopic sample spans a UV-continuum luminosity range of -21.8 ≤ MUV ≤ -19.5 (0.6 ∼ 5 L*UV) and a Lyα luminosity range of (0.3-3) x1043 erg/s (0.3-3 L*Lyα). We derive the UV and Lyα luminosity functions (LFs) from our sample at ∼ 6.2 after we correct for sample incompleteness. We find that our measurement of the UV LF is consistent with the results of previous studies based on photometric LBG samples at 5 < z < 7. Our Lyα LF is also generally in agreement with the results of Lyα-emitter surveys at z ∼ 5.7 and 6.6. This study shows that deep spectroscopic observations of LBGs can provide unique constraints on both the UV and Lyα LFs at z > 6.

Abstract Copyright: ∼

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

Nomenclature: Figs 1-2, Table 1: [JEK2011] NN (Nos 1-19).

Simbad objects: 23

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Number of rows : 23
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 [JEK2011] 14 EmG 13 23 38.6160 +27 26 15.623           ~ 1 0
4 [JEK2011] 16 EmG 13 23 42.1370 +27 33 33.905           ~ 1 0
5 IOK 5 EmG 13 23 45.7580 +27 32 51.342           ~ 5 0
6 [JEK2011] 17 EmG 13 23 50.4840 +27 34 15.078           ~ 1 0
7 [JEM2013] 29 EmG 13 24 05.8940 +27 18 37.703           ~ 5 0
8 [JEM2013] 27 EmG 13 24 10.7690 +27 19 03.918           ~ 5 0
9 [TKO2012] 14 EmG 13 24 20.6260 +27 16 40.408           ~ 6 0
10 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 330 1
11 [JEK2011] 6 EmG 13 24 26.0300 +27 16 02.993           ~ 1 0
12 [JEK2011] 18 EmG 13 24 26.1070 +27 18 40.450           ~ 1 0
13 [JEK2011] 10 EmG 13 24 34.8240 +27 14 18.985           ~ 1 0
14 [JEK2011] 4 EmG 13 24 36.8930 +27 43 41.520           ~ 1 0
15 [JEK2011] 3 EmG 13 24 41.3330 +27 43 16.601           ~ 1 0
16 [JEK2011] 2 EmG 13 24 55.5890 +27 39 20.772           ~ 2 0
17 [JEK2011] 5 EmG 13 25 11.0860 +27 37 47.957           ~ 1 0
18 [JEK2011] 1 EmG 13 25 18.1420 +27 32 32.449           ~ 1 0
19 [JEK2011] 11 EmG 13 25 21.0530 +27 15 24.023           ~ 1 0
20 [NTK2004] SDF J132521.6+274229 EmG 13 25 21.6120 +27 42 28.915           ~ 2 0
21 [JEK2011] 12 EmG 13 25 22.1900 +27 21 41.069           ~ 1 0
22 [JEK2011] 13 EmG 13 25 27.8040 +27 28 58.742           ~ 1 0
23 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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