| 2022년 11월 24일 세미나 공고문 | |||||
| 작성자 | 천문우주과학과 | ||||
|---|---|---|---|---|---|
| 조회수 | 249 | 등록일 | 2022.11.17 | ||
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일시: 2022년 11월 24일 목요일 오후 4시 자4514호(세미나실)
연사: 이범현 박사님(한국천문연구원)
제목: The impact of the group environment on the molecular gas and star formation activity
초록: At least half of the local galaxies reside in galaxy groups, which indicates that the group is the common environment where galaxies evolve. In addition, a substantial fraction of cluster galaxies is already quenched in the group environment before they enter the galaxy cluster, which is known as “preprocessing”. Therefore, it is important to probe how significantly galaxies are affected by group environmental processes, which helps us to obtain a better understanding of galaxy evolution. We carried out a new CO imaging survey for 31 group galaxies in the IC 1459 and NGC 4636 groups, using the Atacama Compact Array (ACA), to study the effect of the group environment on the molecular gas properties and the star formation activity. With our resolved CO data, combined with high-resolution HI images obtained with the Australian Square Kilometer Array Pathfinder (ASKAP), we find asymmetric CO and/or H I distributions in the galaxies of our group sample. In addition, group members have relatively low molecular gas fraction and star formation rate compared to isolated galaxies. These results suggest that the group environment can change the properties of cold gas components and star formation in group galaxies, and thus can play a key role in galaxy evolution. I will also briefly introduce the ALMA large program, VERTICO: The Virgo Environment Traced in CO Survey.
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