COSMOS2020: Identification of High-z Protocluster Candidates in COSMOS

被引：14

作者：

Brinch, Malte ^{[1
,2
]}

Greve, Thomas R. ^{[1
,2
]}

Weaver, John R. ^{[1
,3
]}

Brammer, Gabriel ^{[1
,3
]}

Ilbert, Olivier ^{[4
]}

Shuntov, Marko ^{[5
,6
]}

Jin, Shuowen ^{[1
,2
]}

Liu, Daizhong ^{[7
]}

Gimenez-Arteaga, Clara ^{[1
,3
]}

Casey, Caitlin M. ^{[8
]}

Davidson, Iary ^{[1
,3
]}

Fujimoto, Seiji ^{[1
,3
]}

Koekemoer, Anton M. ^{[9
]}

Kokorev, Vasily ^{[1
,3
]}

Magdis, Georgios ^{[1
,2
,3
,10
]}

McCracken, H. J. ^{[5
,6
]}

McPartland, Conor J. R. ^{[1
,3
,11
,12
]}

Mobasher, Bahram ^{[12
]}

Sanders, David B. B. ^{[11
]}

Toft, Sune ^{[1
,3
]}

Valentino, Francesco ^{[1
,3
]}

Zamorani, Giovanni ^{[13
]}

Zavala, Jorge ^{[8
,14
]}

机构：

[1] Cosmic Dawn Ctr DAWN, Copenhagen, Denmark

[2] Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark

[3] Univ Copenhagen, Niels Bohr Inst, Jagtvej 128, DK-2200 Copenhagen, Denmark

[4] Aix Marseille Univ, CNRS, LAM, Lab Astrophys Marseille, Marseille, France

[5] CNRS, Inst Astrophys Paris, UMR 7095, 98 Bis Blvd Arago, F-75014 Paris, France

[6] Sorbonne Univ, 98 Bis Blvd Arago, F-75014 Paris, France

[7] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany

[8] Univ Texas Austin, 2515 Speedway Blvd,Stop C1400, Austin, TX 78712 USA

[9] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[10] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, 2-21-1 Osawa, Athens 15236, Greece

[11] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[12] Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92521 USA

[13] Ist Nazl Astrofis, Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy

[14] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 943卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

SPECTRAL ENERGY-DISTRIBUTIONS; LARGE-SCALE STRUCTURES; STAR-FORMATION; MASSIVE GALAXIES; PHYSICAL-PROPERTIES; LEGACY SURVEY; DUST CONTENT; REDSHIFT; CLUSTERS; EVOLUTION;

D O I：

10.3847/1538-4357/ac9d96

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We conduct a systematic search for protocluster candidates at z >= 6 in the Cosmic Evolution Survey (COSMOS) field using the recently released COSMOS2020 source catalog. We select galaxies using a number of selection criteria to obtain a sample of galaxies that have a high probability of being inside a given redshift bin. We then apply overdensity analysis to the bins using two density estimators, a Weighted Adaptive Kernel estimator and a Weighted Voronoi Tessellation estimator. We have found 15 significant (>4 sigma) candidate galaxy overdensities across the redshift range 6 <= z <= 7.7. The majority of the galaxies appear to be on the galaxy main sequence at their respective epochs. We use multiple stellar-mass-to-halo-mass conversion methods to obtain a range of dark matter halo mass estimates for the overdensities in the range of similar to 10(11)-10(13) M (circle dot), at the respective redshifts of the overdensities. The number and the masses of the halos associated with our protocluster candidates are consistent with what is expected from the area of a COSMOS-like survey in a standard ? cold dark matter cosmology. Through comparison with simulation, we expect that all of the overdensities at z similar or equal to 6 will evolve into Virgo-/Coma-like clusters at present (i.e., with masses similar to 10(14)-10(15) M (circle dot)). Compared to other overdensities identified at z >= 6 via narrowband selection techniques, the overdensities presented appear to have similar to 10x higher stellar masses and star formation rates (SFRs). We compare the evolution in the total SFR and stellar mass content of the protocluster candidates across the redshift range 6 <= z <= 7.7 and find agreement with the total average SFR from simulations.

引用

页数：47

共 47 条

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ASTROPHYSICAL JOURNAL LETTERS, 2023, 945 (01)
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ASTRONOMY & ASTROPHYSICS, 2022, 667
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ASTRONOMY & ASTROPHYSICS, 2022, 665
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ASTRONOMY & ASTROPHYSICS, 2022, 664
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