Dynamical formation of the GW190814 merger
We investigate the possible dynamical origin of GW190814, a gravitational wave (GW) source discovered by the LIGO-Virgo-Kagra collaboration (LVC) associated with a merger between a stellar black hole (BH) with mass 23.2 M ⊙ and a compact object, either a BH or a neutron star (NS), with mass 2.59 M ⊙...
Gespeichert in:
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2021 February 22
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| In: |
The astrophysical journal. Part 2, Letters
Year: 2021, Jahrgang: 908, Heft: 2, Pages: 1-12 |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/abdfcd |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/2041-8213/abdfcd
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| Verfasserangaben: | Manuel Arca Sedda |
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| 520 | |a We investigate the possible dynamical origin of GW190814, a gravitational wave (GW) source discovered by the LIGO-Virgo-Kagra collaboration (LVC) associated with a merger between a stellar black hole (BH) with mass 23.2 M ⊙ and a compact object, either a BH or a neutron star (NS), with mass 2.59 M ⊙. Using a database of 240,000 N-body simulations modeling the formation of NS-BH mergers via dynamical encounters in dense clusters, we find that systems like GW190814 are likely to form in young, metal-rich clusters. Our model suggests that a little excess (∼2%-4%) of objects with masses in the range of 2.3-3 M ⊙ in the compact remnants’ mass spectrum leads to a detection rate for dynamically formed “GW190814 -like” mergers of ΓGW190814 ≃ 1-6 yr−1 Gpc−3, i.e., within the observational constraints set by the GW190814 discovery, ΓLVC ∼ 1-23 yr−1 Gpc−3. Additionally, our model suggests that ∼1.8%-4.8% of dynamical NS-BH mergers are compatible with GW190426_152155, the only confirmed NS-BH merger detected by the LVC. We show that the relative amount of light and heavy NS-BH mergers can provide clues about the environments in which they developed. | ||
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