2016 Fiscal Year Final Research Report
Measuring the growth history of galaxy outskirts
| Project/Area Number |
15K17603
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Bundy Kevin Allen 東京大学, カブリ数物連携宇宙研究機構, 特任助教 (20624141)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | Spectral fitting / Stellar Gradients / AGN winds / Feedback |
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| Outline of Final Research Achievements |
The purpose of this project was to test the 2-phase formation scenario for elliptical galaxies which states that their central cores are formed early while their outskirts build up through the accretion of "foreign stars" with time. Using the FIREFLY code, we have begun spectral fitting to determine stellar population properties.During this process, an important discovery was made of a new class of galaxy we call Red Geysers. These "red geysers" host unexpected AGN winds and may be a critical reason why star formation remains suppressed in these systems at late times. The resulting paper was published in Nature. Additionally, we returned to the primary analysis of the stellar populations and investigated their dependence on the local environment in which the galaxy lives.
Finally a workshop was held to deeply discuss and compare different approaches for measuring stellar properties from the observed spectra. This workshop was highly successful and will result in improved methods.
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| Free Research Field |
銀河形成
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