안녕하십니까.

오는 수요일(7월 31일) 오후 4:00에 아래와 같이 2024년 상반기 정규 콜로키움이 진행될 예정입니다.

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

발표자: 지명국 교수 (연세대학교)

호스트: 선광일

장소: 장영실홀 331-2

일시: 7월 31일 (수) 오후 4:00

교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여

이번 콜로키움은 오프라인으로만 진행하므로 유의 하시기를 바랍니다

제목: Probes of Dark Matter with Colliding Galaxy Clusters

초록: 

Previously, offsets between galaxies and mass during cluster collisions were regarded as a promising indicator for evaluating the self-interaction cross-section of dark matter. However, past investigations based on these offsets have been hindered by significant biases regarding the phase and geometry of the merger. I will introduce a reliable constraint on the self-interaction of dark matter using a novel and effective approach with observations of cluster collisions featuring double radio relics. By utilizing the distance between relics relative to the distance between halos as a gauge for dark matter characteristics, we have established an upper limit of 0.33 cm^2 g^-1 for the self-interaction cross-section with 68% confidence. This marks the first robust outcome derived from colliding clusters, accounting for ambiguities such as mass variability, viewing angle, collision velocity, merger phase, impact parameter, and gas slope.

진행언어: 영어

슬라이드언어: 영어

2024년 상반기 천문연구원 콜로키움 일정

https://www.kasi.re.kr/kor/publication/post/notice/29938

(위 일정은 연사분의 상황에 따라서 변경될 수 있습니다.)

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

운영위원회 (김진호, 송영범, 오재석, 윤용민, 조영수, 홍경수) 

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Dear all,

The KASI's regular colloquium is scheduled at Jul. 31, as shown below.

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

Speaker: Prof. Myungkook James Jee (Yonsei University)

Host: Kwangil Seon

Place: Jang Yeong-sil Hall 331-2

Time: July 31 (Wed) 4:00 pm 

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

Note that this colloquium is offline only.

Title: Probes of Dark Matter with Colliding Galaxy Clusters

Abstract: 

Previously, offsets between galaxies and mass during cluster collisions were regarded as a promising indicator for evaluating the self-interaction cross-section of dark matter. However, past investigations based on these offsets have been hindered by significant biases regarding the phase and geometry of the merger. I will introduce a reliable constraint on the self-interaction of dark matter using a novel and effective approach with observations of cluster collisions featuring double radio relics. By utilizing the distance between relics relative to the distance between halos as a gauge for dark matter characteristics, we have established an upper limit of 0.33 cm^2 g^-1 for the self-interaction cross-section with 68% confidence. This marks the first robust outcome derived from colliding clusters, accounting for ambiguities such as mass variability, viewing angle, collision velocity, merger phase, impact parameter, and gas slope.

Language: English

Slide Language: English

2024A KASI Colloquium Schedule

https://www.kasi.re.kr/kor/publication/post/notice/29938

(This schedule may vary depending on the speakers' schedule.)

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

Working committee (Jinho Kim, Youngbum Song, Jae Sok Oh, Yongmin Yoon, Youngsoo Jo, Kyeongsoo Hong)