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RC 2020 - HR4

HR4: Highlights of ALMA discoveries in Active Galactic Nuclei
Santiago García Burillo, Observatorio Astronómico Nacional & Almudena Alonso Herrero, Centro de Astrobiología (CSIC-INTA)
Fecha / Date
Martes 14 de julio (mañana) / Tuesday 14 July (morning)
Galactic nuclei are a unique laboratory to study the gas cycle in galaxies.  In particular, high-resolution imaging of the gas flows in galactic nuclei are instrumental in the study of the fueling and the feedback of star formation and nuclear activity in nearby galaxies. Several fueling mechanisms can be now confronted in detail with observations done with state of the art interferometers.  The advent of ALMA has made it possible to study with unprecedented detail the distribution and kinematics of the molecular gas in active galaxies down to ~parsec scales. The central engines of Type 2 AGNs are thought to be hidden behind a screen of obscuring material located in a dusty torus of a few-to-10 parsec size.  Spatially resolving the molecular/dusty tori has been challenging even in nearby Seyfert galaxies (D=10-30Mpc), as angular resolutions <0.1" are required to detect these compact disks with high fidelity. This limitation can now be circumvented using (sub)millimeter interferometers like ALMA. Furthermore, the study of gas flows in galactic nuclei can probe the feedback of activity on the energy balance/redistribution of the interstellar medium of galaxies. In this talk we will discuss the most recent ALMA findings about the gas cycle in nearby active galaxies.