Invited Presentation

Effects of AGN Feedback on the evolution of Early Type Galaxies: hot accretion flows and galactic rotation

Author(s): Doosoo Yoon (SHAO) Yuan Feng (SHAO) Zhaoming Gan (SHAO)

Presenter: Doosoo Yoon (Shanghai Astronomical Observatory, Chinese Academic of Science)

The vast studies of AGN feedback in both observation and theory for the past decade reveal that the feedback plays a critical role in terminating star formation in the galactic bulge and regulating the AGN activities and the growth of the central black hole through lack of fuel for accretion. However, the exact mechanism of the co-evolution between the black holes and the host galaxies remains uncertain, and the theoretical study of this topic is still challenging because of a wide range of dynamic scale from sub pc scale of nuclei to several hundreds kpc scale of galaxies. I will present two projects to help better understanding the effects of the feedback on the evolution of Early Type Galaxies (ETGs). First, I will discuss on the role of hot accretion flow in the feedback. It is widely believed that AGNs spend their most of time in radio-mode, but in many studies, dealing with hot accretion flow is problematic because they made use of old models of hot flows. We adopt new radiative efficiency profile and develop updated model of hot accretion flow into our numerical study of AGN feedback (both radiative and mechanical feedback). Second, I will discuss how AGN feedback affects on the galactic evolution when the host galaxy has an intrinsic high angular momentum. Many recent observations (e.g. ATLAS3D) reveal that large portion of ETGs has a systematic rotation and disk structure in the mid-plane. However, considering galactic rotation in the study of AGN feedback has been technically challenging. To resolve the difficulties, I improve the numerical models, applying 'gravitational torque' mechanism to transport angular momentum outward so that accretion can occur and the AGN can be activated.