2007ApJ...671.1227D

Query : 2007ApJ...671.1227D

2007ApJ...671.1227D - Astrophys. J., 671, 1227-1240 (2007/December-3)

A luminosity function of Lyα-emitting galaxies at z ∼ 4.5.

DAWSON S., RHOADS J.E., MALHOTRA S., STERN D., WANG J., DEY A., SPINRAD H. and JANNUZI B.T.

Abstract (from CDS):

We present a catalog of 59 z~4.5 Lyα-emitting galaxies spectroscopically confirmed in a campaign of Keck DEIMOS follow-up observations to candidates selected in the Large Area Lyα (LALA) narrowband imaging survey. We targeted 97 candidates for spectroscopic follow-up; by accounting for the variety of conditions under which we performed spectroscopy, we estimate a selection reliability of ∼76%. Together with our previous sample of Keck LRIS confirmations, the 59 sources confirmed herein bring the total catalog to 73 spectroscopically confirmed z~4.5 Lyα-emitting galaxies in the ~0.7 deg2 covered by the LALA imaging. As with the Keck LRIS sample, we find that a nonnegligible fraction of the confirmed Lyα lines have rest-frame equivalent widths (Wrestλ) that exceed the maximum predicted for normal stellar populations: 17%-31% (93% confidence) of the detected galaxies show Wrestλ>190 Å, and 12%-27% (90% confidence) show Wrestλ>240 Å. We construct a luminosity function of z~4.5 Lyα emission lines for comparison to Lyα luminosity functions spanning 3.1<z<6.6. We find no significant evidence for Lyα luminosity function evolution from z~3 to z~6. This result supports the conclusion that the intergalactic medium remains largely reionized from the local universe out to z~6.5. It is somewhat at odds with the pronounced drop in the cosmic star formation rate density recently measured between z∼3 and z∼6 in continuum-selected Lyman-break galaxies, and therefore potentially sheds light on the relationship between the two populations.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Observations - Cosmology: Early Universe - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift

VizieR on-line data: <Available at CDS (J/ApJ/671/1227): table1.dat>

Nomenclature: Table 1: LALA JHHMMSS+DDMMSS N=59 added.

Simbad objects: 65

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Number of rows : 65
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 LALA J020418-050748 EmG 02 04 18.1 -05 07 48           ~ 2 0
2 LALA J020423-050647 EmG 02 04 23.2 -05 06 47           ~ 1 0
3 LALA J020425-045610 EmG 02 04 25.4 -04 56 10           ~ 2 0
4 LALA J020425-045810 EmG 02 04 25.7 -04 58 10           ~ 2 0
5 LALA J020427-050045 EmG 02 04 27.4 -05 00 45           ~ 2 0
6 LALA J020428-045924 EmG 02 04 28.5 -04 59 24           ~ 2 0
7 LALA J020429-050251 EmG 02 04 29.7 -05 02 51           ~ 2 0
8 LALA J020432-045519 EmG 02 04 32.3 -04 55 19           ~ 2 0
9 NAME Cetus Field reg 02 05 20 -04 55.0           ~ 28 0
10 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
11 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
12 LALA J142434+352833 EmG 14 24 34.9 +35 28 33           ~ 1 0
13 LALA J142436+352600 EmG 14 24 36.0 +35 26 00           ~ 1 0
14 LALA J142438+352339 EmG 14 24 38.359 +35 23 38.60           ~ 2 0
15 LALA J142439+353801 EmO 14 24 39.8 +35 38 01           ~ 2 0
16 LALA J142445+352920 EmG 14 24 45.170 +35 29 19.21           ~ 2 0
17 LALA J142445+352450 EmG 14 24 45.3 +35 24 50           ~ 1 0
18 LALA J142445+352859 EmG 14 24 45.379 +35 28 58.40           ~ 2 0
19 LALA J142450+353000 EmG 14 24 50.050 +35 29 59.50           ~ 2 0
20 LALA J142452+352613 EmG 14 24 52.409 +35 26 13.12           ~ 2 0
21 LALA J142458+353558 EmG 14 24 58.6 +35 35 58           ~ 1 0
22 LALA J142459+353927 EmG 14 24 59.8 +35 39 27           ~ 1 0
23 LALA J142501+353652 EmG 14 25 01.649 +35 36 51.38           ~ 2 0
24 LALA J142502+353017 EmG 14 25 02.8 +35 30 17           ~ 1 0
25 LALA J142503+353222 EmG 14 25 03.4 +35 32 22           ~ 1 0
26 LALA J142506+353819 EmG 14 25 06.379 +35 38 19.03           ~ 2 0
27 LALA J142508+353952 EmG 14 25 08.249 +35 39 51.80           ~ 2 0
28 LALA J142508+353200 EmG 14 25 08.7 +35 32 00           ~ 1 0
29 LALA J142512+353913 EmG 14 25 11.959 +35 39 12.10           ~ 2 0
30 LALA J142512+353755 EmG 14 25 12.701 +35 37 54.89           ~ 2 0
31 LALA J142518+353415 EmG 14 25 18.0 +35 34 15           ~ 1 0
32 LALA J142522+353553 EmG 14 25 22.4 +35 35 53           ~ 1 0
33 LALA J142525+352349 EmG 14 25 25.9 +35 23 49           ~ 1 0
34 LALA J142526+352531 EmG 14 25 26.119 +35 25 30.30           ~ 2 0
35 LALA J142531+352652 EmG 14 25 31.740 +35 26 51.55           ~ 2 0
36 LALA J142532+353013 EmG 14 25 32.880 +35 30 11.99           ~ 2 0
37 LALA J142535+352743 EmG 14 25 35.2 +35 27 43           ~ 1 0
38 LALA J142539+353902 EmG 14 25 39.499 +35 39 01.29           ~ 2 0
39 LALA J142541+353351 EmG 14 25 41.681 +35 33 50.98           ~ 3 0
40 LALA J142542+352557 EmG 14 25 42.000 +35 25 56.79           ~ 2 0
41 LALA J142542+352626 EmG 14 25 42.530 +35 26 25.53           ~ 2 0
42 LALA J142544+354325 EmG 14 25 44.510 +35 43 24.37           ~ 2 0
43 LALA J142546+354315 EmG 14 25 46.8 +35 43 15           ~ 1 0
44 LALA J142547+354200 EmG 14 25 47.810 +35 41 59.70           ~ 2 0
45 LALA J142548+352740 EmG 14 25 48.389 +35 27 39.82           ~ 2 0
46 LALA J142555+353039 EmG 14 25 55.330 +35 30 38.87           ~ 3 0
47 LALA J142556+354234 EmG 14 25 56.710 +35 42 33.28           ~ 2 0
48 LALA J142556+354215 EmG 14 25 56.820 +35 42 14.25           ~ 2 0
49 LALA J142559+353513 EmG 14 25 59.770 +35 35 12.74           ~ 2 0
50 LALA J142559+353748 EmG 14 25 59.8 +35 37 48           ~ 1 0
51 LALA J142601+353618 EmG 14 26 01.3 +35 36 18           ~ 1 0
52 LALA J142602+354554 EmG 14 26 02.0 +35 45 54           ~ 1 0
53 LALA J142612+353541 EmG 14 26 12.2 +35 35 41           ~ 1 0
54 LALA J142624+353832 EmG 14 26 24.4 +35 38 32           ~ 2 0
55 LALA J142627+353717 EmG 14 26 27.439 +35 37 16.35           ~ 2 0
56 LALA J142628+353808 EmG 14 26 28.469 +35 38 08.74           ~ 3 0
57 LALA J142653+353356 EmG 14 26 53.501 +35 33 55.57           ~ 2 0
58 LALA J142658+353144 EmG 14 26 58.8 +35 31 44           ~ 1 0
59 LALA J142706+353224 EmG 14 27 06.259 +35 32 23.76           ~ 2 0
60 LALA J142709+352738 EmG 14 27 09.1 +35 27 38           ~ 1 0
61 LALA J142709+352409 EmG 14 27 09.180 +35 24 08.67           ~ 2 0
62 LALA J142709+352641 EmG 14 27 09.8 +35 26 41           ~ 1 0
63 LALA J142712+353029 EmG 14 27 12.2 +35 30 29           ~ 1 0
64 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0
65 SSA 22 reg 22 17 34.7 +00 15 07           ~ 351 0

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