ALMA reveals a rotating dense molecular torus in NGC 1068

Colloquium

Astronomy Colloquium (2019 Spring Semester)

* Date: May 9
* Speaker: Dr. Masa Imanishi (NAOJ)
* Title: ALMA reveals a rotating dense molecular torus in NGC 1068
* Abstract

The unification paradigm of active galactic nuclei (AGNs) postulates that a dusty molecular torus is present around a mass accreting supermassive black hole (SMBH), in order to naturally explain the presence of type-1 broad-line and type-2 narrow-line AGNs.
This paradigm was originally proposed based on old observations of the nearby type-2 AGN, NGC 1068 (d ~ 14 Mpc). However, our observational understanding of the putative AGN torus has been highly incomplete even for nearby AGNs, simply because the torus is spatially compact (<10 pc or <0.15″ at >10 Mpc). We present the results of our very high-spatial-resolution (0.04 x 0.07″) ALMA observations of the NGC 1068 nucleus. We have for the first time clearly detected dense molecular gas emission oriented along the east-west direction both morphologically and dynamically, as expected for NGC 1068. I will report detailed observational properties of the dense molecular torus in NGC 1068 revealed from our ALMA observations.

I will also briefly mention our ALMA molecular line observations of deeply buried luminous AGNs in merging ultraluminous infrared galaxies.

Date	Speaker	Title	Remarks
March 7	No Colloquium	OT to the Seminar Course
March 14	Dr. Ena Choi (Columbia Unv.)	Making Massive Elliptical Galaxies
March 21	KASI ALMA TEAM	ALMA Cycle-7 proposal Townhall meeting
March 28	Prof. Changbom Park (KIAS)	Cosmology with Large-scale Structures in the Universe
April 4	Prof. Masateru Ishiguro (SNU)	Hirayama Family and Exploration of Asteroids
April 11	No colloquium	Korean Astronomical Society Spring Meeting
April 18	Prof. Sunghoon Jung (SNU)	Seeing Dark Matter with Gravitational Waves
April 25	Dr. Z. Lucas Uhm (KASI)	Physics of Relativistic Jets in Gamma-ray Bursts in the New Era of Multi-messenger Astrophysics
May 2	Prof. Jeong-Eun Lee (Kyung Hee Univ.)	Chemistry in Star and Planet Formation	Speech in Korean
May 9	Dr. Masa Imanishi (NAOJ)	ALMA reveals a rotating dense molecular torus in NGC 1068
May 16	Dr. Pei-Ying Hsieh (ASIAA)	The Role of the Magnetic Field in the Circumnuclear Disk of the Galactic Center – Implications From 850 micron Polarization Data
May 23	Prof. Sascha Trippe (SNU)	At the End of Space and Time: Imaging the Black Hole in M 87	Special colloquium on the recent result of the Event Horizon Telescope (EHT)
May 30	Naeun Shin (SNU)	대학원생이 바라본 해외교육지원단 3기 원정대 활동
June 6	No colloquium	Memorial Day
June 13	Dr. Shinsuke Takasao (NAGOYA Univ.)	Investigating the accretion process onto young stars using 3D MHD simulations

2019 Spring semester detail