Table · dataset · 2025
High-z protocluster candidates from COSMOS2020
Listed in IVOA Registry (Virtual Observatory)
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.
Description
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 ~10^11^-10^13^M_{sun}_, at the respective redshifts of the overdensities.
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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 {Lambda} cold dark matter cosmology. Through comparison with simulation, we expect that all of the overdensities at z~6 will evolve into Virgo-/Coma-like clusters at present (i.e., with masses ~10^14^-10^15^M_{sun}_). Compared to other overdensities identified at z>=6 via narrowband selection techniques, the overdensities presented appear to have ~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.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/943/153 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJ...943..153B ui.adsabs.harvard.edu/abs/2023ApJ...943..153B ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apj/943/153 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Simulation 75%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/943/153 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[method].local:method:simulation | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |