2023 Fiscal Year Research-status Report
Formation and Evolution of Supermassive Black Holes Probed by High-Redshift Active Galactic Nuclei
| Project/Area Number |
23KJ0589
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
ZHANG Yechi 国立天文台, 科学研究部, 特別研究員(PD)
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| Project Period (FY) |
2023-04-25 – 2025-03-31
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| Keywords | galaxy formation / galaxy evolution / supermassive black holes / active galactic nuclei |
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| Outline of Annual Research Achievements |
Throughout the first year of the project, two main topics have been investigated: a) the co-evolution of the supermassive black holes (SMBH) and their host galaxies, b) potential outflow activities in high-redshift galaxies that may affect both SMBH and galaxy growth.
The SMBH-galaxy co-evolution has been investigated through z=2 to z=7. At z=2-3, the low mass end of the stellar mass (M_*) - black hole mass (M_BH) relation has been studied with the untargeted integral field spectroscopic (IFS) survey of Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). The results, which were published in Zhang et al. 2023, ApJ, 948, 103, show that SMBHs with M_BH=10^7-10^9 M_sun at z=2 grow more efficiently than their local counterparts. A Subaru proposal has been submitted for further investigations on these systems. At z=4-7, similar results have been analyzed and obtained in a sample of 10 type 1 active galactic nuclei (AGNs) from the James Webb Space Telescope (JWST) data (Harikane et al. 2023, ApJ, 959, 39), indicating the early growth of SMBHs.
The outflow in high-redshift galaxies has been investigated with the James Webb Space Telescope (JWST) data. The results show that outflows in z=6-9 galaxies are likely to be more related to periodic star-forming histories rather than feedback from SMBHs. The paper has been accepted for publication in ApJ. Further investigation is under way.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Based on data from JWST, active galactic nuclei (AGNs) at z=4-7 has been identified and investigated. At z=2-3, the study on the co-evolution of SMBHs and galaxies is progressing as planned.
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| Strategy for Future Research Activity |
Future studies will focus on the detection of a larger number of AGNs, including the dust-obscured ones, at z>4. At z=2-3, a Subaru Prime Focus Spectrogragh (PFS) proposal is in preparation to precisely measure the black hole masses of faint AGNs. These results will provide insights into the co-evolution of SMBHs and galaxies in the early epoch.
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| Causes of Carryover |
The research grant in the first year is not fully used due to the fact that the publication of one paper was delayed to the next fiscal year. It will be used together with the grant in the following fiscal year mainly on observations, publications, and international conferences.
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