Artigo Acesso aberto Revisado por pares

Cosmic evolution of black hole spin and galaxy orientations: Clues from the NewHorizon and Galactica simulations

2024; EDP Sciences; Volume: 686; Linguagem: Inglês

10.1051/0004-6361/202349101

ISSN

1432-0746

Autores

Sébastien Peirani, Yasushi Suto, Ricarda S. Beckmann, Marta Volonteri, Yen‐Ting Lin, Yohan Dubois, Sukyoung K. Yi, Christophe Pichon, Katarina Kraljic, Minjung Park, Julien Devriendt, San Han, Wei-Huai Chen,

Tópico(s)

Astronomy and Astrophysical Research

Resumo

(Reduced) Using the recent cosmological high-resolution zoom-in simulations, NewHorizon and Galactica, in which the evolution of black hole spin is followed on the fly, we have tracked the cosmic history of a hundred of black holes (BHs) with a mass greater than 2x10^4 Ms. For each of them, we have studied the variations of the three dimensional angle (Psi) subtended between the BH spins and the angular momentum vectors of their host galaxies. The analysis of the individual evolution of the most massive BHs suggests that they are generally passing by three different regimes. First, for a short period after their birth, low mass BHs (<3x10^4 Ms) are rapidly spun up by gas accretion and their spin tends to be aligned with their host galaxy spin. Then follows a second phase in which the accretion of gas onto low mass BHs ( 10^5 Ms). In this case, the BH spins tend to be well aligned with the angular momentum of their host galaxy and this configuration is generally stable even though BH merger episodes can temporally induce misalignment. We have also derived the distributions of cos(Psi) at different redshifts and found that BHs and galaxy spins are generally aligned. Finally, based on a Monte Carlo method, we also predict statistics for the 2-d projected spin-orbit angles lambda. In particular, the distribution of lambda traces well the alignment tendency in the 3-d analysis. Such predictions provide an interesting background for future observational analyses.

Referência(s)