Jump To Date
View By Semester
View By Series
Add An Event

Center for Astrophysics Research and Technologies Seminar Series Information


Events Calendar

Binary Stellar Mass Black Holes in AGN Disks as Possible LIGO Sources

Thursday September 14, 2023
2:00 pm

 Presenter:  Hui Li (Los Alamos National Laboratory)
 Series:  Center for Astrophysics Research and Technologies Seminar Series
 Abstract:  The recent GW190521 event – an 85 Msun and a 66 Msun black hole (BH) coalescing to a 142 Msun BH – the heaviest binary black hole (BBH) merger to date has opened up new discussions on the formation channels of BBHs. In this talk, we focus on the scenario where BBHs are embedded inside an AGN disk (disk around a supermassive black hole at the center of a galaxy). We will present simulations on how stellar mass black hole binaries could form in AGN disks. We will also use high-resolution 2D and 3D hydrodynamical and magnetohydrodynamic simulations to examine the physical processes that regulate their orbital evolution. We demonstrate that there is a hierarchy of disk structures in such an embedded BBH, including the circum-single disk (CSD) and the circum-binary disk (CBD), both of which play an essential role in regulating the angular momentum evolution. We discuss the parameter spaces that will cause the BBH to contract or expand. Lastly, we explore the likely electromagnetic signatures from such events. Implications for possible observational signatures for the upcoming Observing Cycle 4 by LIGO/Virgo/KAGRA will be discussed as well.
 Host:  Ylva Pihlström
 Location:  PAIS-3205, PAIS

Disability Notice If you need an auxiliary aid or service to attend any Department of Physics and Astronomy event, please contact the department (phone: 505 277-2616; email: physics@unm.edu) as far in advance as possible to ensure you are accommodated.