2021NatAs...5..485H

Query : 2021NatAs...5..485H

2021NatAs...5..485H - Nature Astronomy, 5, 485-490 (2021)

A Lyman-α protocluster at redshift 6.9.

HU W., WANG J., INFANTE L., RHOADS J.E., ZHENG Z.-Y., YANG H., MALHOTRA S., BARRIENTOS L.F., JIANG C., GONZALEZ-LOPEZ J., PRIETO G., PEREZ L.A., HIBON P., GALAZ G., COUGHLIN A., HARISH S., KONG X., KANG W., KHOSTOVAN A.A., PHARO J., VALDES F., WOLD I., WALKER A.R. and ZHENG X.

Abstract (from CDS):

Protoclusters, the progenitors of the most massive structures in the Universe, have been identified at redshifts of up to 6.6. Besides exploring early structure formation, searching for protoclusters at even higher redshifts is particularly useful to probe the reionization. Here we report the discovery of the protocluster LAGER-z7OD1 at a redshift of 6.93, when the Universe was only 770 million years old and could be experiencing rapid evolution of the neutral hydrogen fraction in the intergalactic medium. The protocluster is identified by an overdensity of 6 times the average galaxy density, and with 21 narrowband selected Lyman-α galaxies, among which 16 have been spectroscopically confirmed. At redshifts similar to or above this record, smaller protogroups with fewer members have been reported. LAGER-z7OD1 shows an elongated shape and consists of two subprotoclusters, which would have merged into one massive cluster with a present-day mass of 3.7 x 1015 solar masses. The total volume of the ionized bubbles generated by its member galaxies is found to be comparable to the volume of the protocluster itself, indicating that we are witnessing the merging of the individual bubbles and that the intergalactic medium within the protocluster is almost fully ionized. LAGER-z7OD1 thus provides a unique natural laboratory to investigate the reionization process.

Abstract Copyright: ©

Journal keyword(s): Astrophysics - Astrophysics of Galaxies

Nomenclature: [HWI2021] LAGER-z7OD1 N=1. Suppl. Table 1: [HWI2021] LAE-NN (Nos 1-21).

Simbad objects: 28

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Number of rows : 28
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 Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
3 [HWI2021] LAE-2 EmG 10 01 53.50 +02 04 59.8           ~ 2 0
4 [HWI2021] LAE-1 EmG 10 02 06.00 +02 06 46.3           ~ 2 0
5 [HWI2021] LAE-14 EmG 10 02 08.30 +02 06 59.6           ~ 2 0
6 [HWI2021] LAE-8 EmG 10 02 09.00 +02 04 11.0           ~ 2 0
7 [HWI2021] LAE-15 EmG 10 02 23.40 +02 05 04.8           ~ 2 0
8 [HWI2021] LAE-16 EmG 10 02 32.90 +02 05 52.8           ~ 2 0
9 [HWI2021] LAE-13 EmG 10 02 33.20 +02 07 09.5           ~ 2 0
10 [IOZ2018] HSC-z7LAE24 EmG 10 02 37.80 +02 13 39.2           ~ 2 0
11 [HWI2021] LAE-11 EmG 10 02 39.40 +02 07 12.1           ~ 2 0
12 [HWI2021] LAE-10 EmG 10 02 42.30 +02 06 55.2           ~ 2 0
13 [HWI2021] LAE-20 EmG 10 02 47.10 +02 10 40.1           ~ 1 0
14 [HWI2021] LAGER-z7OD1 PCG 10 02.8 +02 09           ~ 4 0
15 [IOZ2018] HSC-z7LAE16 EmG 10 02 56.50 +02 17 22.6           ~ 2 0
16 [HWI2021] LAE-12 EmG 10 03 00.10 +02 14 49.5           ~ 1 0
17 [IOZ2018] HSC-z7LAE6 EmG 10 03 04.40 +02 17 15.1           ~ 2 0
18 [HWI2021] LAE-7 EmG 10 03 05.20 +02 09 14.7           ~ 2 0
19 [HWI2021] LAE-3 EmG 10 03 10.50 +02 12 30.8           ~ 1 0
20 [HWI2021] LAE-21 EmG 10 03 15.60 +02 18 11.3           ~ 2 0
21 [HWI2021] LAE-9 EmG 10 03 16.00 +02 15 42.3           ~ 1 0
22 [HWI2021] LAE-6 EmG 10 03 28.00 +02 08 51.3           ~ 1 0
23 [HWI2021] LAE-5 EmG 10 03 30.70 +02 14 08.5           ~ 1 0
24 [HWI2021] LAE-4 EmG 10 03 32.70 +02 09 25.1           ~ 1 0
25 [HWI2021] LAE-17 EmG 10 03 33.50 +02 07 19.8           ~ 1 0
26 [HWI2021] LAE-18 EmG 10 03 37.30 +02 07 36.7           ~ 1 0
27 [HWI2021] LAE-19 EmG 10 03 39.30 +02 07 47.2           ~ 1 0
28 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2

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