The physical properties of AGN outflows and their impact on host galaxies from low to high redshift

Colloquium

Astronomy Colloquium (2020 Fall Semester)

* Date: Oct 29
* Speaker: Dr. Giovanni Cresci (Arcetri Observatory)
* Title: The physical properties of AGN outflows and their impact on host galaxies from low to high redshift
* Abstract

Feedback from AGN is considered the main physical mechanism to quench star formation in galaxies, at least at the high mass end of the galaxy population. This feedback is believed to operate through powerful, massive outflows driven by the energy release operated by the AGN. However, while outflows are ubiquitous in AGN, their impact on host galaxies and physical properties are still poorly known. In particular, measurements of the outflow physical properties still rely on very rough assumptions which must be overcome when dealing with the wealth of information provided by the new integral field spectroscopic observations.
I will present the results from several observational programs targeting AGN host galaxies from low to high redshift and aimed to understanding the physical properties of the outflows and their impact on the host galaxies, using integral field spectroscopy. I will also present evidence for galaxy scale ionised outflows in four Ultra Fast Outflows hosts, showing relativistic X-ray winds observed at the nuclear scale. The momentum rates of these ionised outflows are comparable to those measured for the UFOs at sub-pc scales, indicating momentum-driven wind propagation, and discuss the implications of these findings.

Date	Speaker	Title	Remarks
Sep 10	–	–
Sep 17	Dr. Youngung Lee(Kasi)	From Black Hole to Double Eyelid Surgery / 블랙홀에서 쌍꺼풀수술까지	Time: 15:45
Sep 24	–	No colloquium: thesis proposals
Oct 01	–	Chuseck(Korean Thanksgiving Day)
Oct 08	Dr. Satoko Sawada-Satoh(Yamaguchi University )	Radio absorption lines as good tracers in the central region of extragalaxies	Time:16:00
Oct 15	–	[KAS Fall Meeting]
Oct 22	Dr. Eckard Sturm (MPE Garching)	The core of the matter – spatially resolving the nuclei of Active Galaxies with VLTI/GRAVITY	Time:16:00
Oct 29	Dr. Giovanni Cresci (Arcetri Observatory)	The physical properties of AGN outflows and their impact on host galaxies from low to high redshift	Time: 16:30
Nov 05	Prof. Hyung Mok Lee (SNU/KASI)	Gravitational Wave Events from Three Observing Runs of LIGO/Virgo and Their Implications on the Formation Mechanisms
Nov 12	TBA	TBA
Nov 19	TBA	TBA
Nov 26	Dr. Kyungsuk Cho	Toward a next generation solar coronagraph
Dec 03	TBA	TBA

2020 fall semester detail