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An extreme protocluster of luminous dusty starbursts in the early universe

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Title: An extreme protocluster of luminous dusty starbursts in the early universe
Authors: Oteo, I
Ivison, RJ
Dunne, L
Manilla-Robles, A
Maddox, S
Lewis, AJR
De Zotti, G
Bremer, M
Clements, DL
Cooray, A
Dannerbauer, H
Eales, S
Greenslade, J
Omont, A
Perez-Fournon, I
Riechers, D
Scott, D
Van der Werf, P
Weiss, A
Zhang, Z-Y
Item Type: Journal Article
Abstract: We report the identification of an extreme protocluster of galaxies in the early universe whose core (nicknamed Distant Red Core, DRC, because of its very red color in Herschel SPIRE bands) is formed by at least 10 dusty star-forming galaxies (DSFGs), spectroscopically confirmed to lie at ${z}_{\mathrm{spec}}=4.002$ via detection of [C i](1–0), 12CO(6–5), 12CO(4–3), 12CO(2–1), and ${{\rm{H}}}_{2}{\rm{O}}({2}_{11}\mbox{--}{2}_{02})$ emission lines with ALMA and ATCA. These DSFGs are distributed over a $260\,\mathrm{kpc}\times 310\,\mathrm{kpc}$ region and have a collective obscured star formation rate (SFR) of $\sim 6500\,{M}_{\odot }\,{\mathrm{yr}}^{-1}$, considerably higher than those seen before in any protocluster at $z\gtrsim 4$. Most of the star formation is taking place in luminous DSFGs since no Lyα emitters are detected in the protocluster core, apart from a Lyα blob located next to one of the DRC components, extending over $60\,\mathrm{kpc}$. The total obscured SFR of the protocluster could rise to $\mathrm{SFR}\sim {\rm{14,400}}\,{M}_{\odot }\,{\mathrm{yr}}^{-1}$ if all the members of an overdensity of bright DSFGs discovered around DRC in a wide-field Large APEX BOlometer CAmera 870 μm image are part of the same structure. [C i](1–0) emission reveals that DRC has a total molecular gas mass of at least ${M}_{{{\rm{H}}}_{2}}\sim 6.6\times {10}^{11}\,{M}_{\odot }$, and its total halo mass could be as high as $\sim 4.4\times {10}^{13}\,{M}_{\odot }$, indicating that it is the likely progenitor of a cluster at least as massive as Coma at z = 0.
Issue Date: 20-Mar-2018
Date of Acceptance: 22-Nov-2017
URI: http://hdl.handle.net/10044/1/60406
DOI: https://dx.doi.org/10.3847/1538-4357/aaa1f1
ISSN: 0004-637X
Publisher: American Astronomical Society
Journal / Book Title: Astrophysical Journal
Volume: 856
Issue: 1
Copyright Statement: © 2018 The American Astronomical Society. All rights reserved.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Imperial College Trust
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: SPIRE/SOW/07020F
ST/F012373/1
ST/G001901/1
ST/G003874/1
ST/J004812/1
ST/J001368/1
N/A
ST/K006401/1
ST/M003558/1
ST/P000568/1
ST-N000838
ST/N000838/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: clusters: general
galaxies: evolution
galaxies: high-redshift
radio lines: ISM
submillimeter: galaxies
submillimeter: ISM
STAR-FORMING GALAXIES
HIGH-REDSHIFT GALAXY
XMM CLUSTER SURVEY
ULTRA DEEP FIELD
ALL-SKY SURVEY
SUBMILLIMETER GALAXIES
MOLECULAR GAS
NUMBER COUNTS
BOLOMETER CAMERA
ATOMIC CARBON
0201 Astronomical And Space Sciences
0305 Organic Chemistry
0306 Physical Chemistry (Incl. Structural)
Publication Status: Published
Open Access location: https://arxiv.org/abs/1709.02809
Article Number: ARTN 72
Online Publication Date: 2018-03-26
Appears in Collections:Physics
Astrophysics



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