2021 Fiscal Year Annual Research Report
Effect of Local Environment on Galaxy Quenching and Morphology at z < 1
| Project/Area Number |
20K14514
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Galaxy evolution / Galaxy morphology / Hyper Suprime-Cam |
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| Outline of Annual Research Achievements |
We utilised the Subaru Hyper Suprime-Cam (HSC) imaging, covering 100 deg^2, to measure structural properties of ~1.5 million galaxies at z < 1. We carefully calibrated our measurements using simulated galaxies to account for various systematic biases. Our test using the simulated galaxies showed that we obtain sizes for galaxies with i< 24.5 mag with 5% accuracy (or better).
As a demonstration of science, PI has utilised the size measurements to robustly determine the size-mass relation over the broad range in stellar mass and show that the relations for are better characterised a double-power function: the relation is steeper slope above the pivot mass. Our result from the HSC are in excellent agreements with those from the spaced-based observations, particularly for low-mass galaxies, strongly suggesting that our size measurements are robust and not driven by a systematic bias.
The larger sample of massive galaxies than the previous deep surveys enable us to derive the tighter constraint on the size-mass relation for most massive galaxies. The results presented here bridge the gap between the local Universe (z~0) and the high redshift works. PI has submitted the publication with the title “Hyper Suprime-Cam Subaru Strategic Survey: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at z<1” to The Astrophysical Journal. The manuscript has been accepted for publication. We have also made our catalog available to HSC Collaboration.
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