안녕하십니까.

오는 수요일(1월 14일) 오후 4:00에 아래와 같이 2025년 하반기 정규 콜로키움이 진행될 예정입니다.

발표 후에는 연사와의 대화시간(5:00-5:40) 및 저녁 식사가 예정되어 있으니 많은 참여 부탁드립니다.

발표자:  장청펑 박사 (KASI & Yonsei University)

호스트: 신윤경

장소: 장영실홀 331-2 및 원격 연결

일시: 1월 14일 (수) 오후 4:00

접속주소: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여

제목: Gas Regulation and Star-Formation Quenching in Local Galaxy Ecosystems

초록: 

Galaxies in the local universe can be viewed as complex ecosystems in which energy flows and matter cycles are regulated by internal processes and environmental effects. Investigating the ISM, star formation, and quenching mechanisms is essential for a comprehensive understanding of the regulation and evolution of galaxy ecosystems. In this talk, I will highlight our statistical results derived from extensive multi-wavelength surveys of local galaxies. Our analysis reveals that central disk galaxies with star formation rates significantly below the star-forming main sequence unexpectedly possess HI gas reservoirs comparable to those of star-forming galaxies, but exhibit substantially lower molecular gas content and star formation efficiency. We further demonstrate that quenching in these central disk galaxies is closely linked to bulge growth, bar-driven activity, and feedback from low-luminosity AGN. These results lead to a coherent picture of how internal “mass quenching” operates. Additionally, we find that the residual HI gas content provides a robust diagnostic for distinguishing between internally driven and environmentally driven quenching pathways in satellite galaxies. Finally, I will present our latest insights into the star formation law, derived from studies of dust properties in the local galaxy population.
 

진행언어: 영어

슬라이드언어: 영어

원격 접속 방법 :

A. 웹 브라우저: Chrome을 추천하며 아래 주소를 실행시 Zoom 구동을 위한 프로그램이 설치될 수 있음

B. 접속 주소: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

C. 유의사항: 접속 후 "마이크는 뮤트로 설정" - 기본설정은 뮤트로 되어있음 > 질의 응답시간에는 마이크를 사용해서 질문 가능함

천문연 콜로키움 위원회 (김종수, 선광일, 이창원, 문홍규, 노혜림, 한정열)

운영위원회 (김진호, 김영민, 이석호, 홍준석, 석지연, 이재현)

----------

Dear all,

The KASI's regular colloquium is scheduled at Jan. 14, as shown below.

A conversation session with speakers and dinner are scheduled after the colloquium.

Speaker: Dr. Chengpeng Zhang (KASI & Yonsei University)

Host: 신윤경

Place: Jang Yeong-sil Hall 331-2 & Online

Time: January 14 (Wed) 4:00 pm 

Access: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

KASI Educational credits: 0.5 educational credits are awarded to off-line attendees.

Title: Gas Regulation and Star-Formation Quenching in Local Galaxy Ecosystems

Abstract: 

Galaxies in the local universe can be viewed as complex ecosystems in which energy flows and matter cycles are regulated by internal processes and environmental effects. Investigating the ISM, star formation, and quenching mechanisms is essential for a comprehensive understanding of the regulation and evolution of galaxy ecosystems. In this talk, I will highlight our statistical results derived from extensive multi-wavelength surveys of local galaxies. Our analysis reveals that central disk galaxies with star formation rates significantly below the star-forming main sequence unexpectedly possess HI gas reservoirs comparable to those of star-forming galaxies, but exhibit substantially lower molecular gas content and star formation efficiency. We further demonstrate that quenching in these central disk galaxies is closely linked to bulge growth, bar-driven activity, and feedback from low-luminosity AGN. These results lead to a coherent picture of how internal “mass quenching” operates. Additionally, we find that the residual HI gas content provides a robust diagnostic for distinguishing between internally driven and environmentally driven quenching pathways in satellite galaxies. Finally, I will present our latest insights into the star formation law, derived from studies of dust properties in the local galaxy population.
 

Language: English

Slide Language: English

Remote access procedure:

A. Web browser: Chrome - When executing the address below, a program for additional zoom operation can be installed.

B. Access: Go to  https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

C. Notice: After join, Please mute your microphone. - The default setting is microphone mute. > After the presentation, during the Q&A session, you can use the microphone to ask questions.

KASI Colloquium committee (Jongsoo Kim, Kwang-Il Seon, Chang Won Lee, Hong-Kyu Moon, Hyerim Noh, Jeong-Yeol Han)

Working committee (Jinho Kim, Young-Min Kim, Seokho Lee, Junseok Hong,  Ji Yeon Seok, Jaehyun Lee)