A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3

Ke Shi, Kyoung Soo Lee, Arjun Dey, Yun Huang, Nicola Malavasi, Chao Ling Hung, Hanae Inami, Matthew Ashby, Kenneth Duncan, Rui Xue, Naveen Reddy, Sungryong Hong, Buell Tomasson Jannuzi, Michael C. Cooper, Anthony H. Gonzalez, Huub J.A. Röttgering, Phillip N. Best, Cyril Tasse

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number83
JournalAstrophysical Journal
Volume871
Issue number1
DOIs
StatePublished - Jan 20 2019

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census
coma
galaxies
environmental effect
simulation
stars
starburst galaxies
star formation rate
massive stars
sky
star formation
emitters
analogs
distribution
rate
scaling

Keywords

  • cosmology: observations
  • galaxies: clusters: general
  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Shi, K., Lee, K. S., Dey, A., Huang, Y., Malavasi, N., Hung, C. L., ... Tasse, C. (2019). A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3. Astrophysical Journal, 871(1), [83]. https://doi.org/10.3847/1538-4357/aaf85d

A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3. / Shi, Ke; Lee, Kyoung Soo; Dey, Arjun; Huang, Yun; Malavasi, Nicola; Hung, Chao Ling; Inami, Hanae; Ashby, Matthew; Duncan, Kenneth; Xue, Rui; Reddy, Naveen; Hong, Sungryong; Jannuzi, Buell Tomasson; Cooper, Michael C.; Gonzalez, Anthony H.; Röttgering, Huub J.A.; Best, Phillip N.; Tasse, Cyril.

In: Astrophysical Journal, Vol. 871, No. 1, 83, 20.01.2019.

Research output: Contribution to journalArticle

Shi, K, Lee, KS, Dey, A, Huang, Y, Malavasi, N, Hung, CL, Inami, H, Ashby, M, Duncan, K, Xue, R, Reddy, N, Hong, S, Jannuzi, BT, Cooper, MC, Gonzalez, AH, Röttgering, HJA, Best, PN & Tasse, C 2019, 'A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3', Astrophysical Journal, vol. 871, no. 1, 83. https://doi.org/10.3847/1538-4357/aaf85d
Shi, Ke ; Lee, Kyoung Soo ; Dey, Arjun ; Huang, Yun ; Malavasi, Nicola ; Hung, Chao Ling ; Inami, Hanae ; Ashby, Matthew ; Duncan, Kenneth ; Xue, Rui ; Reddy, Naveen ; Hong, Sungryong ; Jannuzi, Buell Tomasson ; Cooper, Michael C. ; Gonzalez, Anthony H. ; Röttgering, Huub J.A. ; Best, Phillip N. ; Tasse, Cyril. / A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3. In: Astrophysical Journal. 2019 ; Vol. 871, No. 1.
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abstract = "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.",
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AU - Hung, Chao Ling

AU - Inami, Hanae

AU - Ashby, Matthew

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