A MASSIVE, DISTANT PROTO-CLUSTER AT z = 2.47 CAUGHT IN A PHASE OF RAPID FORMATION?

C. M Casey; A Cooray; P Capak; H Fu; K Kovac; S Lilly; D. B Sanders; N. Z Scoville; E Treister

doi:10.1088/2041-8205/808/2/L33

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A MASSIVE, DISTANT PROTO-CLUSTER AT z = 2.47 CAUGHT IN A PHASE OF RAPID FORMATION?

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A MASSIVE, DISTANT PROTO-CLUSTER AT z = 2.47 CAUGHT IN A PHASE OF RAPID FORMATION?

C. M Casey, A Cooray, P Capak, H Fu, K Kovac, S Lilly, D. B Sanders, N. Z Scoville and E Treister

Astrophysical journal. Letters, Vol.808(2), pp.1-8

07/24/2015

DOI: 10.1088/2041-8205/808/2/L33

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Abstract

ABSTRACT Numerical simulations of cosmological structure formation show that the universe's most massive clusters, and the galaxies living in those clusters, assemble rapidly at early times ( ). While more than 20 proto-clusters have been observed at based on associations of 5-40 galaxies around rare sources, the observational evidence for rapid cluster formation is weak. Here we report observations of an asymmetric filamentary structure at z = 2.47 containing 7 starbursting, submillimeter-luminous galaxies and 5 additional active galactic nuclei (AGNs) within a comoving volume of 15,000 Mpc3. As the expected lifetime of both the luminous AGN and starburst phase of a galaxy is ∼100 Myr, we conclude that these sources were likely triggered in rapid succession by environmental factors or, alternatively, the duration of these cosmologically rare phenomena is much longer than prior direct measurements suggest. The stellar mass already built up in the structure is ∼1012 and we estimate that the cluster mass will exceed that of the Coma supercluster at . The filamentary structure is in line with hierarchical growth simulations that predict that the peak of cluster activity occurs rapidly at .

galaxies: clusters: general

galaxies: starburst

large-scale structure of universe

quasars: general

Details

Title: Subtitle: A MASSIVE, DISTANT PROTO-CLUSTER AT z = 2.47 CAUGHT IN A PHASE OF RAPID FORMATION?
Creators: C. M Casey - University of California, Irvine
A Cooray - University of California, Irvine
P Capak - Infrared Processing and Analysis Center
H Fu - University of Iowa
K Kovac - ETH Zurich
S Lilly - ETH Zurich
D. B Sanders - Institute for Astronomy, University of Hawai’i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA
N. Z Scoville - California Institute of Technology
E Treister - University of Concepción
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.808(2), pp.1-8
DOI: 10.1088/2041-8205/808/2/L33
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: The American Astronomical Society
Number of pages: 8
Language: English
Date published: 07/24/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199841202771

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