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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3
Astrophysical Journal, Volume 871, No. 1, Article 83, Year 2019
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Description
We present a detailed census of galaxies in and around PC 217.96+32.3, a spectroscopically confirmed Coma analog at z = 3.78. Diverse galaxy types identified in the field include Lyα emitters (LAEs), massive star-forming galaxies, and ultramassive galaxies (≳ 10 11 M o ) which may have already halted their star formation. The sky distribution of the star-forming galaxies suggests the presence of a significant overdensity (δ SFG ≈ 8 ±2), which is spatially offset from the previously confirmed members by 3-4 Mpc to the west. Candidate quiescent and post-starburst galaxies are also found in large excess (a factor of ∼8-15 higher surface density than the field's), although their redshifts are less certain. We estimate that the total enclosed mass traced by the candidate star-forming galaxies is roughly comparable to that of PC 217.96+32.3 traced by the LAEs. We speculate that the true extent of PC 217.96+32.3 may be larger than previously known, half of which is missed by our LAE selection. Alternatively, the newly discovered overdensity may belong to another Coma progenitor not associated with PC 217.96+32.3. Expectations from theory suggest that both scenarios are equally unlikely (<1%) in the cosmic volume probed in our survey. If confirmed as a single structure, its total mass will be well in excess of Coma's, making it an exceptionally large cosmic structure rarely seen even in large cosmological simulations. Finally, we find that the protocluster galaxies follow the same star formation rate-M ∗ scaling relation as the field galaxies, suggesting that the environmental effect at z ∼ 4 is a subtle one at best for normal star-forming galaxies. © 2019. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Dey, Arjun T.
United States, Tucson
National Optical Astronomy Observatory
Inami, Hanae
France, Saint-genis-laval
Observatoire de Lyon
Ashby, Matthew L.N.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Duncan, Kenneth J.
Netherlands, Leiden
Universiteit Leiden
Xue, Rui
United States, West Lafayette
Purdue University
United States, Iowa City
University of Iowa
Reddy, Naveen A.
United States, Riverside
University of California, Riverside
Jannuzi, Buell T.
United States, Tucson
The University of Arizona
Cooper, Michael C.
United States, Irvine
University of California, Irvine
González, Anthony H.
United States, Gainesville
University of Florida
R̈ottgering, Huub J.A.R.
Netherlands, Leiden
Universiteit Leiden
Best, Phillip N.
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Tasse, Cyril
France, Paris
L'observatoire de Paris
Statistics
Citations: 17
Authors: 12
Affiliations: 15
Identifiers
Doi:
10.3847/1538-4357/aaf85d
ISSN:
0004637X
Study Design
Cross Sectional Study
Study Approach
Quantitative