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| Natura: | Preprint |
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2024
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| Accesso online: | https://arxiv.org/abs/2407.02460 |
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| _version_ | 1866910839804526592 |
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| author | Hernandez, Ignacio Magaña Palmese, Antonella |
| author_facet | Hernandez, Ignacio Magaña Palmese, Antonella |
| contents | We analyze the confident binary black hole (BBH) detections from the third Gravitational-Wave Transient Catalog (GWTC-3) with an alternative mass population model in order to capture features in the mass distribution beyond the Powerlaw + Peak model. We find that the peak of a second power law characterizes the $\sim 30-35~ M_\odot$ bump, such that the data marginally prefers a mixture of two power laws for the mass distribution of binary components over a Powerlaw + Peak model with a Bayes Factor $\log_{10}\mathcal{B}$ of 0.24. This result may imply that the $\sim 30-35~ M_\odot$ feature represents the onset of a second population of BBH mergers (e.g. from a dynamical formation channel) rather than a specific mass feature over a broader distribution. When an additional Gaussian bump is allowed within our power law mixture model, we find a new feature in the BH mass spectrum at $\sim65-70~M_\odot$ ($\log_{10}\mathcal{B}$ = 0.29 compared to Powerlaw + Peak). This new feature may be consistent with hierarchical mergers, and constitute $\sim3\%$ of the BBH population. This model also recovers a maximum mass of $58^{+32}_{-14}~M_\odot$ for the second power law, consistent with the onset of a pair-instability supernova mass gap. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02460 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new bump in the night: evidence of a new feature in the binary black hole mass distribution at $70~M_{\odot}$ from gravitational-wave observations Hernandez, Ignacio Magaña Palmese, Antonella High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We analyze the confident binary black hole (BBH) detections from the third Gravitational-Wave Transient Catalog (GWTC-3) with an alternative mass population model in order to capture features in the mass distribution beyond the Powerlaw + Peak model. We find that the peak of a second power law characterizes the $\sim 30-35~ M_\odot$ bump, such that the data marginally prefers a mixture of two power laws for the mass distribution of binary components over a Powerlaw + Peak model with a Bayes Factor $\log_{10}\mathcal{B}$ of 0.24. This result may imply that the $\sim 30-35~ M_\odot$ feature represents the onset of a second population of BBH mergers (e.g. from a dynamical formation channel) rather than a specific mass feature over a broader distribution. When an additional Gaussian bump is allowed within our power law mixture model, we find a new feature in the BH mass spectrum at $\sim65-70~M_\odot$ ($\log_{10}\mathcal{B}$ = 0.29 compared to Powerlaw + Peak). This new feature may be consistent with hierarchical mergers, and constitute $\sim3\%$ of the BBH population. This model also recovers a maximum mass of $58^{+32}_{-14}~M_\odot$ for the second power law, consistent with the onset of a pair-instability supernova mass gap. |
| title | A new bump in the night: evidence of a new feature in the binary black hole mass distribution at $70~M_{\odot}$ from gravitational-wave observations |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2407.02460 |