Characterizing multi-phase gas outflows and their powering mechanism in nearby AGN

Colloquium

Astronomy Colloquium (2019 Fall Semester)

* Date: Oct. 31
* Speaker: Dr. Bernd Husemann (MPIA)
* Title: Characterizing multi-phase gas outflows and their powering mechanism in nearby AGN
* Abstract

Active Galactic Nuclei are thought to play a crucial role in the evolution of massive galaxies. In particular, fast outflows are frequently observed in AGN covering various gas phases which may remove a significant fraction of the gas content from the galaxies. I will review the current state of research in this very active field of ongoing research together with the advantages and disadvantages of previous approaches. In particular, I will highlight the importance of multi-wavelength observations to unravel the true multi-phase nature of outflows by combining state-of-the-art observational facilities. In this context I will present the first results from the ongoing Close AGN Reference Survey (CARS), a multi-wavelength survey of 39 luminous low-redshift unobscured AGN with extensive observations from VLT/MUSE, ALMA, VLA, Chandra, SOFIA and many more. So far we found a lack of hot gas as predicted by radiative wind scenarios, but a surprisingly strong [CII] excess in case of a powerful kpc size wind enriched with cold gas. Overall we find that more than 50% of the high-velocity outflows are very compact <100pc and that the radio jets likely play an important role as a driving mechanisms for these massive multi-phase outflows from AGN.

Date	Speaker	Title	Remarks
Sept 04 (Wednesday)	Dr. Bomee Lee (Caltech)	Probing the nature of dark matter through measurements of galaxy shapes	Wednesday
Sept. 12	No Colloquium	추석연휴
Sept. 19.	권오철 작가님	우주에 대한 호기심이 영화가 되기 까지
Sept. 26	Prof. Jongchul Chae (SNU)	Three-minute Umbral Oscillations in Sunspots [태양흑점의 3분 암부진동]
Oct. 2	Dr. Jeongwoo Lee (New Jersey Institute of Technology/ ISS, Shandong Univ.)	EUV and Microwave Studies of a Circular-Ribbon Solar Flare	Wednesday
Oct. 10	Dr. Michiel van Noort (Max-Planck Institute for solar system research),	Image restoration of solar data using multi frame blind deconvolution
Oct. 17	No Colloquium	Korean Astronomical Society Meeting
Oct. 24	Dr. Jongwan Ko (KASI)	Finding the origin of intracluster light	Talk in Korean
Oct. 31	Dr. Bernd Husemann (MPIA)	Characterizing multi-phase gas outflows and their powering mechanism in nearby AGN
Nov. 7	Prof. Hirofumi NODA (OSAKA Univ.)	Structure and State Transition of Supermassive Black Hole Accretion Flow Studied by Multi-Wavelength Observations
Nov. 14	Dr. Jinhee Lee (Kyung Hee Univ.)	Introduction to nearby young stellar moving groups
Nov. 21	Dr. Nobuyuki Sakai (KASI)	Mapping the Milky Way with Astrometry
Nov. 28	박새별 (KAIST / 안테나뮤직)	예술과 과학의 상호작용- 문화기술(Culture Technology)의 이해와 가능성
Dec. 5	Dr. Do-Young Byun (KASI)	The Extended KVN Project	Talk in Korean
Dec. 27.	Prof. Paul Yun, NASA Solar System Ambassador	NASA Space Economy	11:00 AM

2019 Fall semester detail