Hierarchical binary black hole mergers in globular clusters: mass function and evolution with redshift
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866911985196597248 |
|---|---|
| author | Torniamenti, Stefano Mapelli, Michela Périgois, Carole Sedda, Manuel Arca Artale, M. Celeste Dall'Amico, Marco Vaccaro, M. Paola |
| author_facet | Torniamenti, Stefano Mapelli, Michela Périgois, Carole Sedda, Manuel Arca Artale, M. Celeste Dall'Amico, Marco Vaccaro, M. Paola |
| contents | Hierarchical black hole (BH) mergers are one of the most straightforward mechanisms to produce BHs inside and above the pair-instability mass gap. Here, we investigate the impact of globular cluster (GC) evolution on hierarchical mergers, and we account for the uncertainties related to BH mass pairing functions on the predicted primary BH mass, mass ratio and spin distribution. We find that the evolution of the host GC quenches the hierarchical BH assembly already at the third generation, mainly due to cluster expansion powered by a central BH sub-system. Hierarchical mergers match the primary BH mass distribution from GW events for $m_1 > 50 \, \mathrm{M_{\odot}}$, regardless of the assumed BH pairing function. At lower masses, however, different pairing functions lead to dramatically different predictions on the primary BH mass merger rate density. We find that the primary BH mass distribution evolves with redshift, with a larger contribution from mergers with $m_1 \geq 30 \, \mathrm{M_{\odot}}$ for $z\geq{}2$. Finally, we calculate the mixing fraction of BBHs from GCs and isolated binary systems. Our predictions are very sensitive to the spins, which favor a large fraction ($>0.6$) of BBHs born in GCs, in order to reproduce misaligned spin observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_14837 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Hierarchical binary black hole mergers in globular clusters: mass function and evolution with redshift Torniamenti, Stefano Mapelli, Michela Périgois, Carole Sedda, Manuel Arca Artale, M. Celeste Dall'Amico, Marco Vaccaro, M. Paola High Energy Astrophysical Phenomena Astrophysics of Galaxies Hierarchical black hole (BH) mergers are one of the most straightforward mechanisms to produce BHs inside and above the pair-instability mass gap. Here, we investigate the impact of globular cluster (GC) evolution on hierarchical mergers, and we account for the uncertainties related to BH mass pairing functions on the predicted primary BH mass, mass ratio and spin distribution. We find that the evolution of the host GC quenches the hierarchical BH assembly already at the third generation, mainly due to cluster expansion powered by a central BH sub-system. Hierarchical mergers match the primary BH mass distribution from GW events for $m_1 > 50 \, \mathrm{M_{\odot}}$, regardless of the assumed BH pairing function. At lower masses, however, different pairing functions lead to dramatically different predictions on the primary BH mass merger rate density. We find that the primary BH mass distribution evolves with redshift, with a larger contribution from mergers with $m_1 \geq 30 \, \mathrm{M_{\odot}}$ for $z\geq{}2$. Finally, we calculate the mixing fraction of BBHs from GCs and isolated binary systems. Our predictions are very sensitive to the spins, which favor a large fraction ($>0.6$) of BBHs born in GCs, in order to reproduce misaligned spin observations. |
| title | Hierarchical binary black hole mergers in globular clusters: mass function and evolution with redshift |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.14837 |