Talk detail

Participant	Mastrobuono Battisti, Alessandra
Institution	Max Planck Institute for Astronomy - Koenigstuhl 17 - Heidelberg - - Germany

Session	GW8	Accepted	Yes	Order	5	Time	17:50	20' + 5'
Talk	Oral abstract	Title	The assembly history of nuclear star clusters: black holes and pulsars
Coauthors	Tsatsi, Athanasia; Abbate, Federico; Perets, Hagai
Abstract	Nuclear star clusters (NSCs) are dense stellar systems known to exist in galactic nuclei. Although their evolution is connected to that of the host galaxy, their origin is still unknown. Here we explore one of the possible formation channels in which globular clusters migrate to the center of the galaxy, disrupt and build up the NSC around a central supermassive black hole. We use several N-body simulations and models constrained by observations from the Milky Way to follow the formation and evolution of NSCs. We find that the simulated system can show properties that make it comparable with the Galactic NSC, including significant rotation, a fact that has been so far attributed to gas infall and in situ star formation. We explore the kinematic evolution of the simulated NSC to illustrate how the merger history can imprint fossil records on its dynamical structure. In particular, we focus our attention on the millisecond pulsar distribution and its contribution to the gamma-ray excess at the Galactic Centre and we investigate the effects of stellar and intermediate-mass black holes on the build-up of the NSC.
Pdf file

Session	BH2	Accepted	Yes	Order	2	Time	15:35	20'
Talk	Oral abstract	Title	The assembly history of nuclear star clusters: supermassive, intermediate mass and stellar black-holes
Coauthors	Perets, Hagai; Tsatsi, Athanasia
Abstract	Nuclear star clusters (NSCs) are dense stellar systems known to exist in galactic nuclei around supermassive black holes. Although their evolution is connected to that of the host galaxy, their origin is still unknown. Here we explore one of the possible formation channels in which globular clusters migrate to the center of the galaxy, disrupt and build up the NSC. We use several N-body simulations and models constrained by observations from the Milky Way to follow the formation and evolution of NSCs. We find that the simulated system can show properties that make it comparable with the Galactic NSC, including significant rotation, a fact that has been so far attributed to gas infall and in situ star formation. We explore the kinematic evolution of the simulated NSC to illustrate how the merger history and the presence of stellar black holes can imprint observable fossil records on its dynamical structure. Additionally, we discuss the effects of stellar and intermediate-mass black holes on the build-up of the NSC.
Pdf file