2022 Fiscal Year Annual Research Report
| Project/Area Number |
21F51024
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| Allocation Type | Single-year Grants |
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| Research Institution | Chiba University |
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Principal Investigator |
石山 智明 千葉大学, 統合情報センター, 准教授 (90616426)
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| Co-Investigator(Kenkyū-buntansha) |
ELHASHASH MOHAMED 千葉大学, 統合情報センター, 外国人特別研究員
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| Project Period (FY) |
2021-11-18 – 2024-03-31
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| Keywords | 宇宙論 / 銀河団 / 銀河 / ダークマター |
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| Outline of Annual Research Achievements |
During 2021, I published one paper and submitted 3 papers. I had a visit to the Instituto de Astrofisica de Andalucia (CSIC), Spain, for two months working on the project of correlation function of galaxy clusters and detecting the BAO. I also had a visit to the National Research Institute of Astronomy and Geophysics, Egypt, for two months working on the project of the BCG stellar mass-cluster mass relation. During my visit to Egypt I participated and organized a cosmology school of the Middle-East and Africa School on Large Galaxy Surveys for Cosmology. Those activities over the sea are also based on the collaborations of my host researcher in Japan.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Currently, I am leading two projects for:
(1) Studying The correlation function and Baryon Acoustic Oscillations (BAO) of The SDSS－GalWCat19 Galaxy Cluster Catalog. The correlation function is a powerful tool for constraining the cosmological parameters. Utilizing GalWCat19 cluster catalog and the Uchuu N-body simulations, we plan to study correlation function to investigate how the power-law clustering changes with mass on small scales and constrain the cosmological parameters from the BAO signal on large scales.
(2) Studying the correlations between properties of the brightest cluster central galaxy (BCG) and cluster masses to understand the environmental effect of the host clusters on the formation and evolution of central galaxies. Utilizing the GalWCat19 cluster catalog and Uchuu, nu2GC, and illustris-TNG simulations, we will study the relationships between the stellar mass of the central galaxy and cluster dynamical mass.
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| Strategy for Future Research Activity |
I am planning to conduct a new project of studying the velocity dispersion profiles of galaxy clusters. An accurate measure of cluster mass is a critical task because all studies on large- and small-scales are strongly dependent on these measures. A large uncertainty in estimating dynamical cluster mass and extracting cosmological information is due to the bias between galaxies and dark matter subhalos. Comparing the velocity distribution of galaxies in clusters with those obtained from N-body and hydrodynamical simulations as well as semi-analytic model allows to understand the physical processes that govern this bias. Once we understand this bias, the cluster dynamical mass can be estimated with high accuracy. The idea is to generate templates of velocity dispersion profiles using simulations and then use these templates to estimate the masses of observed clusters.
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