发布日期：2024-05-06
点击次数：
标题：Biases and uncertainties in quantifying morphology of galaxies at high redshifts with JWST
时间：Friday, May 10, 2024, 12:30 am
主讲人：Si-Yue Yu 余思悦 (IPMU)
地点：S727
Observations of high-redshift galaxies with unprecedented detail have now been rendered possible with JWST. However, accurately quantifying their morphology remains uncertain due to potential biases and uncertainties. To address this issue, I used a sample of 1816 nearby DESI galaxies to compute artificial images of galaxies of the same mass located at high redshifts and observed at rest-frame optical wavelength in CEERS. I analyzed the effects of cosmological redshift on the measurements of galaxy size, asymmetry, concentration, axis ratio, and Sérsic index. Additionally, I explored how these effects impact the identification and quantification of bar structures and breaks in surface brightness profiles. Correction functions are derived and can be applied to other surveys, offering valuable tools for future studies.
BIO
Name: Si-Yue Yu (余思悦)
2010—2014: B.S. in physics, Xiamen University
2014—2020: PhD in astronomy, Peking University (supervisor: Luis Ho)
2020—2021: gap due to COVID19
2021—2023: Humboldt research fellow
2024—present: Kavli IPMU fellow
Research interests:
Origins of the Hubble sequence
Extragalactic star formation
