Systematic study of the stellar initial mass function and its variation

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K17600
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: MORE Surhud 東京大学, カブリ数物連携宇宙研究機構, 特任助教 (00646044)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: Stellar IMF constraints / HSC weak lensing

Outline of Final Research Achievements

The purpose of this project was to develop methods to put constraints on the　initial mass function of stars using weak gravitational lensing and　stacking of　stellar spectra. High signal-to-noise ratio stacked spectra of SDSS-BOSS　galaxies as a function of different BOSS galaxy properties have been　obtained　and the theoretical analysis of these stacked spectra is ongoing. We were　able　to infer limits on the stellar mass of BOSS galaxies using the weak　gravitational lensing signal from the CFHTLS survey which could distinguish　between theoretical estimates based on different initial mass functions.　Measurement of the stellar masses of BOSS galaxies will require the　measurement of the weak lensing signal in crowded regions in the Hyper　Suprime-Cam (HSC) survey. We have developed and implemented a blendedness　parameter to identify blended objects. As part of this project, we have also　developed a weak lensing pipeline for the analysis of Hyper Suprime-Cam data.

Free Research Field

天文学