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| 저자 : 한국천문학회 | 등록일시 : 2023-05-15 13:20:02 | |||||||||
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안녕하십니까.
이번주 수요일(5월 17일) 오전 10:30에 아래와 같이 정규 콜로퀴움이 진행될 예정입니다. 많은 참여 부탁드립니다. 발표자 : 박종호 박사 (천문연구원) 호스트 : 최지훈 (전파천문본부) 장소 : 장영실홀 331-2 및 원격 연결 일시 : 5월 17일 (수) 오전 10:30 접속주소 : https://zoom.us/j/93209513727?pwd=YUxsRjNaVUg3Z3p4VmxPMUZrOU1YZz09 교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여 제목: Observing the Supermassive Black Hole at
the Center of M87 using EHT and GMVA+ALMA 초록: The nearby
radio galaxy M87 is a prime target to study black hole accretion and jet
formation. Event Horizon Telescope observations of M87 in 2017, at a wavelength
of 1.3 mm, revealed a ring-like structure which was interpreted as
gravitationally lensed emission around a central black hole. Here we report new
images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the
compact radio core is spatially resolved. High resolution imaging reveals a
ring-like structure of 8.4-1.1+0.5 Schwarzschild radii in diameter, ~50% larger
than that seen at 1.3 mm, with the outer edge at 3.5 mm also being larger than
that at 1.3 mm. This larger and thicker ring indicates a significant
contribution from the accretion flow with high self-absorption opacity effects,
added to the gravitationally lensed ring-like emission. The new images show
that the edge–brightened jet connects to the black hole’s accretion flow. Close
to the black hole, the emission profile of the jet launching region is wider
than the expected profile of a black hole driven jet, suggesting the possible
presence of a wind associated with the accretion flow. A paper summarizing
these findings has been published in the journal Nature. During this
presentation, I will discuss the physical significance of the M87 black hole
images captured at 1.3 and 3.5 mm, as well as the experiments underway in Korea
that aim to provide further insight into the characteristics of this black hole. 진행언어 : 영어 슬라이드언어 : 영어 원격 접속 방법 : A. 웹 브라우저 : Chrome을 추천하며 아래 주소를 실행시 Zoom 구동을 위한 프로그램이 설치될 수 있음 2023년 상반기 KASI 콜로퀴움 일정 https://www.kasi.re.kr/kor/post/eng_colloquium (위 일정은 연사분의 상황에 따라서 변경될 수 있습니다.) 천문연 콜로퀴움 위원회 (홍성욱, 최지훈, 오희영) 드림 Dear all, KASI's regular colloquium is scheduled for May 17. Speaker: Dr. Jongho Park (KASI) Host : Jihoon Choi Place : Jang Yeong-sil Hall 331-2 & Online Time : May 17 (Wed) 10:30 am Access: https://zoom.us/j/93209513727?pwd=YUxsRjNaVUg3Z3p4VmxPMUZrOU1YZz09 KASI Educational credits: 0.5 educational credits are awarded
to off-line attendees. Title: Observing the Supermassive Black Hole at the Center of M87 using EHT and
GMVA+ALMA Abstract: The nearby radio galaxy M87 is a prime target to
study black hole accretion and jet formation. Event Horizon Telescope
observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like
structure which was interpreted as gravitationally lensed emission around a
central black hole. Here we report new images of M87 obtained in 2018, at a
wavelength of 3.5 mm, showing that the compact radio core is spatially
resolved. High resolution imaging reveals a ring-like structure of 8.4-1.1+0.5
Schwarzschild radii in diameter, ~50% larger than that seen at 1.3 mm, with the
outer edge at 3.5 mm also being larger than that at 1.3 mm. This larger and
thicker ring indicates a significant contribution from the accretion flow with
high self-absorption opacity effects, added to the gravitationally lensed
ring-like emission. The new images show that the edge–brightened jet connects
to the black hole’s accretion flow. Close to the black hole, the emission
profile of the jet launching region is wider than the expected profile of a
black hole driven jet, suggesting the possible presence of a wind associated
with the accretion flow. A paper summarizing these findings has been published
in the journal Nature. During this presentation, I will discuss the physical
significance of the M87 black hole images captured at 1.3 and 3.5 mm, as well
as the experiments underway in Korea that aim to provide further insight into
the characteristics of this black hole. 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/93209513727?pwd=YUxsRjNaVUg3Z3p4VmxPMUZrOU1YZz09 C. Notice : After join, Please mute your microphone. - The default
setting is microphone mute. 2023A KASI Colloquium Schedule https://www.kasi.re.kr/kor/post/eng_colloquium (This schedule may be changed according to the situation of the
speaker.) KASI Colloquium committee (Sungwook E. Hong, Jihoon
Choi, Heeyoung Oh) |
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| 이전글 | [SKA-Korea Colloquium] 5월 24일 (수) 16:00 Prof. Shane O'Sullivan (Dublin City University) |
| 다음글 | [KASI Colloquium] May 24 (Wed) 10:30 am - 이희재 (천문연) / Hee-Jae Lee (KASI) |
