USTC Astronomy Seminar Series: 2025 Fall
Formation and Evolution of Local Massive Red Spiral Galaxies
郝彩娜 教授
天津师范大学天体物理中心
2025/11/18, 2:30pm , the 19th-floor Observatory Hall

报告人:
Dr. Cai-Na Hao is the director of Tianjin Astrophysics Center in Tianjin Normal University. She obtained her PhD from the National Astronomical Observatories, Chinese Academy of Sciences (CAS) in 2006. Afterwards, she worked as a postdoc at the Institute of Astronomy, University of Cambridge until her move to the Tianjin Astrophysics Center in 2009. Her main research interests are the observational studies of galaxy formation and evolution at both low and high redshifts, including earlier work on far-infrared QSOs, star formation rate calibrations, Lyman-alpha emitters at cosmic noon, local massive (U)LIRGs, and recent work on red spiral galaxies. She has published more than 40 refereed papers in major international Journals, which has been cited for over 5300 times.摘要:
The formation of disk/spiral galaxies is an important subject in astrophysics. Observations showed that disk galaxies are mostly star-forming and blue, while elliptical galaxies are predominantly quiescent and red. Therefore, it is generally believed that the quenching of star formation in galaxies are accompanied by morphological transformation. However, the existence of red passive spirals poses a challenge to this picture. First, I will present our work on understanding the formation pathways of optically-selected, massive red spirals in the local universe. We found that local massive red spirals are probably remnants of very gas-rich major mergers at redshift above 1. Then, I will discuss two classes of galaxies that likely represent different modes of "rejuvenation" of red spirals: blue spiral galaxies with dense cores, which show central "rejuvenation", and optically red spirals with blue NUV-r colors, which show "rejuvenation" in their outskirts.
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