안녕하십니까.

오는 수요일(10월 7일) 오후 4:00에 아래와 같이 2026년 하반기 정규 콜로키움이 진행될 예정입니다.

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

발표자: Prof. Jeffrey Hodgson (Sejong University)

호스트: David Parkinson

장소: 장영실홀 331-2 및 원격 연결

일시: 10월 7일 (수) 오후 4:00

접속주소: https://us06web.zoom.us/j/84840334355?pwd=3FUkcuaYwNQwscjoUSo3ulk6KPPo6x.1

교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여

제목: The Quasar Distance Elevator: first "single-rung" cosmological constraints

초록: 

We present early results from a new radio AGN "single rung" cosmological distance measure  that can measure distances up to high redshift. Many of the tantalizing hints of new physics in cosmology rely on combining different cosmological distance measures. A potential problem could be compounding errors, ultimately affecting final cosmological parameter measurements. Ideally, we could use an entirely independent "single-rung" method for measuring cosmological distances that operates across all redshift ranges.
The Quasar Distance Elevator is the combination of a few related and internally self-consistent ways of measuring distances to quasars that rely on the 'Standard Speed-Gun' that uses the speed of light to calibrate a standard ruler. Archival and new observations as part of the QUOKKAS project have lead to the first preliminary 'single-rung' cosmological parameter estimation.
The addition of observations of AGNs with VLBI detected counter-jets will further improve the method and will be an ideal use case for SKA-VLBI, ngVLA and a global-KVN.

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://us06web.zoom.us/j/84840334355?pwd=3FUkcuaYwNQwscjoUSo3ulk6KPPo6x.1

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

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

운영위원회 (김진호, 유영삼, 송상헌, 강지현, 박성홍, 이희재)

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Dear all,

The KASI's regular colloquium is scheduled at Oct. 7, as shown below.

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

Speaker: Prof. Jeffrey Hodgson (Sejong University)

Host: David Parkinson

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

Time: October 7 (Wed) 4:00 pm 

Access: https://us06web.zoom.us/j/84840334355?pwd=3FUkcuaYwNQwscjoUSo3ulk6KPPo6x.1

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

Title: The Quasar Distance Elevator: first "single-rung" cosmological constraints

Abstract: 

We present early results from a new radio AGN "single rung" cosmological distance measure  that can measure distances up to high redshift. Many of the tantalizing hints of new physics in cosmology rely on combining different cosmological distance measures. A potential problem could be compounding errors, ultimately affecting final cosmological parameter measurements. Ideally, we could use an entirely independent "single-rung" method for measuring cosmological distances that operates across all redshift ranges.
The Quasar Distance Elevator is the combination of a few related and internally self-consistent ways of measuring distances to quasars that rely on the 'Standard Speed-Gun' that uses the speed of light to calibrate a standard ruler. Archival and new observations as part of the QUOKKAS project have lead to the first preliminary 'single-rung' cosmological parameter estimation.
The addition of observations of AGNs with VLBI detected counter-jets will further improve the method and will be an ideal use case for SKA-VLBI, ngVLA and a global-KVN.

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://us06web.zoom.us/j/84840334355?pwd=3FUkcuaYwNQwscjoUSo3ulk6KPPo6x.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, Jeong-Yeol Han, Sungwook Hong)

Working committee (Jinho Kim, Young Sam Yu, Sanghun Song, Jihyun Kang, Hee-Jae Lee, Sung-Hong Park)