안녕하십니까.

이번주 수요일(11월 16일) 오전 10:30에 아래와 같이 정규 콜로퀴움이 진행될 예정입니다. 많은 참여 부탁드립니다. 이번주의 경우 온라인 세미나만 진행됩니다.

발표자 : Dr. Benedict Bahr-Kalus (KASI)

호스트 : David Parkinson (이론천문센터)

장소 : 원격 연결 (연사의 사정으로 인하여 온라인 진행)

일시 : 11월 16일 (수) 오전 10:30

접속주소 : https://us02web.zoom.us/j/84597516884?pwd=OHVjOEQra1lSZ242K2tOZWY4T2Nzdz09

제목: A measurement of the Integrated Sachs-Wolfe Effect with the Rapid ASKAP Continuum Survey

초록: 

The evolution of the gravitational potentials on large scales due to the accelerated expansion of the Universe is an important and independent probe of dark energy, known as the integrated Sachs-Wolfe (ISW) effect. We measure this ISW effect through cross-correlating the cosmic microwave background maps from the Planck satellite with a radio continuum galaxy distribution map from the recent Rapid ASKAP Continuum Survey (RACS). We detect a positive cross-correlation at ~2.8σ relative to the null hypothesis of no correlation. We parameterise the strength of the ISW effect through an amplitude parameter and find the constraints to be A_ISW = 0.94^{+0.42}_{-0.41}, which is consistent with the prediction of an accelerating universe within the current concordance cosmological model, ΛCDM. The credible interval on this parameter is independent of the different bias models and redshift distributions that were considered when marginalising over the nuisance parameters. We also detect a power excess in the galaxy auto-correlation angular power spectrum on large scales (ℓ≤40), and investigate possible systematic causes.

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://us02web.zoom.us/j/84597516884?pwd=OHVjOEQra1lSZ242K2tOZWY4T2Nzdz09
C. 유의사항 : 접속 후 "마이크는 뮤트로 설정" - 기본설정은 뮤트로 되어있음
    > 질의 응답시간에는 마이크를 사용해서 질문 가능함

2022년 하반기 KASI 콜로퀴움 일정

https://www.kasi.re.kr/kor/post/eng_colloquium

(위 일정은 연사분의 상황에 따라서 변경될 수 있습니다.)

Dear all,

KASI's regular colloquium is scheduled on this Wednesday, November 16.

Due to the circumstances of the speaker, only online seminars will be held.

Speaker : Dr. Benedict Bahr-Kalus (KASI)

Host : David Parkinson 

Place : Online

Time : Nov. 16 (Wed) 10:30 am 

Access: https://us02web.zoom.us/j/84597516884?pwd=OHVjOEQra1lSZ242K2tOZWY4T2Nzdz09

Title: A measurement of the Integrated Sachs-Wolfe Effect with the Rapid ASKAP Continuum Survey

Abstract: 

The evolution of the gravitational potentials on large scales due to the accelerated expansion of the Universe is an important and independent probe of dark energy, known as the integrated Sachs-Wolfe (ISW) effect. We measure this ISW effect through cross-correlating the cosmic microwave background maps from the Planck satellite with a radio continuum galaxy distribution map from the recent Rapid ASKAP Continuum Survey (RACS). We detect a positive cross-correlation at ~2.8σ relative to the null hypothesis of no correlation. We parameterise the strength of the ISW effect through an amplitude parameter and find the constraints to be A_ISW = 0.94^{+0.42}_{-0.41}, which is consistent with the prediction of an accelerating universe within the current concordance cosmological model, ΛCDM. The credible interval on this parameter is independent of the different bias models and redshift distributions that were considered when marginalising over the nuisance parameters. We also detect a power excess in the galaxy auto-correlation angular power spectrum on large scales (ℓ≤40), and investigate possible systematic causes.

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://us02web.zoom.us/j/84597516884?pwd=OHVjOEQra1lSZ242K2tOZWY4T2Nzdz09

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.

2022B 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)