Breaching the limit: formation of GW190521-like and IMBH mergers in young massive clusters
The LIGO-Virgo-Kagra Collaboration (LVC) discovered recently GW190521, a gravitational wave (GW) source associated with the merger between two black holes (BHs) with mass 66 and >85 M ⊙. GW190521 represents the first BH binary merger with a primary mass falling in the upper-mass gap and the first...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2021 October 21
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| In: |
The astrophysical journal
Year: 2021, Jahrgang: 920, Heft: 2, Pages: 1-17 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ac1419 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/ac1419
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| Verfasserangaben: | Manuel Arca-Sedda, Francesco Paolo Rizzuto, Thorsten Naab, Jeremiah Ostriker, Mirek Giersz, and Rainer Spurzem |
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| 520 | |a The LIGO-Virgo-Kagra Collaboration (LVC) discovered recently GW190521, a gravitational wave (GW) source associated with the merger between two black holes (BHs) with mass 66 and >85 M ⊙. GW190521 represents the first BH binary merger with a primary mass falling in the upper-mass gap and the first leaving behind an ∼150 M ⊙ remnant. So far, the LVC has reported the discovery of four further mergers having a total mass >100 M ⊙, i.e., in the intermediate-mass black hole (IMBH) mass range. Here, we discuss results from a series of 80 N-body simulations of young massive clusters that implement relativistic corrections to follow compact object mergers. We discover the development of a GW190521-like system as the result of a third-generation merger, and four IMBH-BH mergers with total mass (300-350)M ⊙. We show that these IMBH-BH mergers are low-frequency GW sources detectable with LISA and Deci-hertz Interferometer Gravitational wave Observatory (DECIGO) out to redshift z = 0.01-0.1 and z > 100, and we discuss how their detection could help unraveling IMBH natal spins. For the GW190521 test case, we show that the third-generation merger remnant has a spin and effective spin parameter that matches the 90% credible interval measured for GW190521 better than a simpler double merger and comparable to a single merger. Due to GW recoil kicks, we show that retaining the products of these mergers require birth sites with escape velocities ≳50-100 km s−1, values typically attained in galactic nuclei and massive clusters with steep density profiles. | ||
| 700 | 1 | |a Rizzuto, Francesco Paolo |e VerfasserIn |0 (DE-588)1235538842 |0 (DE-627)1760556947 |4 aut | |
| 700 | 1 | |a Naab, Thorsten |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ostriker, Jeremiah |e VerfasserIn |4 aut | |
| 700 | 1 | |a Giersz, Mirek |e VerfasserIn |4 aut | |
| 700 | 1 | |a Spurzem, Rainer |e VerfasserIn |0 (DE-588)1019645636 |0 (DE-627)690981015 |0 (DE-576)35852086X |4 aut | |
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