SCHOOL OF ASTRONOMY :: Activities

E-Services

Special Seminar - Dr. Mojtaba Raouf

Impact of AGN feedback on the dynamics of gas; A Review Across Diverse Environments
By Dr. Mojtaba Raouf Hajar Zarrin
Leiden University We examine the relationship between black hole activity and kinematic gas-star misalignment in different galaxies. In the case of brightest group galaxies (BGGs), the formation history of galaxy groups is assessed through "age-dating" as an indicator of distinct major mergers involving the BGG. BGGs within groups characterized by a higher frequency of major mergers are more likely to host active supermassive black holes (SMBHs). A consistent correlation is identified between the level of black hole activity, as indicated by the 1.4 GHz and 325 MHz radio emissions, and the degree of kinematic misalignment between the gas and stellar components in BGGs. In dynamically "fossil" groups, where black hole accretion rate is relatively (~ 1 dex) lower due to the lack of recent (= 1 Gyr) major mergers, there is reduced (~ 30%) misalignment between the gas and stellar components of BGGs compared to non-fossil groups. Through examining the smaller-scale properties and dynamics of the gas disc influenced by mechanical AGN feedback, hydrodynamic simulations (HDGAS) suggest that AGN wind-induced effects further lead to persistent gas misalignment of the disk around the supermassive black hole, independent of environmental impacts.

Time: 13:30 PM, 13th of August 2024; 23rd of Mordad 1403

https://www.skyroom.online/ch/soa/weekly-seminar