Natal Kicks from the Galactic Center and Implications on their Environment and the Roman Space Telescope
| Autor: | Jurado, Carlos, Naoz, Smadar, Lam, Casey Y., Hoang, Bao-Minh |
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| Rok vydání: | 2023 |
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| Druh dokumentu: | Working Paper |
| Popis: | Most galaxies, including the Milky Way, harbor a central supermassive black hole (SMBH) weighing millions to billions of solar masses. Surrounding these SMBHs are dense regions of stars and stellar remnants, such as neutron stars and black holes. Neutron stars and possibly black holes receive large natal kicks at birth on the order of hundreds of km s$^{-1}$. The natal kicks that occur in the vicinity of an SMBH may redistribute the orbital configuration of the compact objects and alter their underlying density distribution. We model the effects of natal kicks on a Galactic Center (GC) population of massive stars and stellar binaries with different initial density distributions. Using observational constraints from stellar orbits near the GC, we place an upper limit on the steepness of the initial stellar profile and find it to be core-like. In addition, we predict that $30-70 \%$ of compact objects become unbound from the SMBH due to their kicks and will migrate throughout the galaxy. Different black hole kick prescriptions lead to distinct spatial and kinematic distributions. We suggest that the Roman Space Telescope may be able to distinguish between these distributions and thus be able to differentiate natal kick mechanisms. Comment: 18 pages, 11 Figures. Revised version accepted for publication in ApJ |
| Databáze: | arXiv |
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