منابع مشابه
Supermassive Stars: Fact or Fiction?
Supermassive black holes are now realized to exist in the centers of most galaxies. The recent discoveries of luminous quasars at redshifts higher than 6 require that these black holes were assembled already when the Universe was less than a billion years old. They might originate from the collapse of supermassive stars, a scenario which could ensure a sufficiently rapid formation. Supermassive...
متن کاملSupermassive Stars in Quasar Disks
We propose that supermassive stars may form in quasar accretion disks, and we discuss possible observational consequences. The structure and stability of very massive stars are reviewed. Because of high accretion rates, quasar disks are massive and the fringes of their optically luminous parts are prone to fragmentation. Starting from a few hundred solar masses, a dominant fragment will grow to...
متن کاملRelativistic Collapse of Rotating Supermassive Stars to Supermassive Black Holes
There is compelling evidence that supermassive black holes (SMBHs) exist. Yet the origin of these objects, or their seeds, is still unknown. We are performing general relativistic simulations of gravitational collapse to black holes in different scenarios to help reveal how SMBH seeds might arise in the universe. SMBHs with ∼ 10 M⊙ must have formed by z > 6, or within 10 yrs after the Big Bang,...
متن کاملSupermassive Boson Stars: Prospects for Observational Detection
Although it is commonly believed that the center of the Galaxy is a supermassive black hole, it is not yet established on a firm observational basis. We have recently shown 1 that a supermassive boson or soliton star, if it exists at all, could well be at the center of some galaxies, including ours. These models can be in agreement current observations, and fit very well into dynamical and grav...
متن کاملSupermassive Stars as Gamma-Ray Bursters
We propose that the gravitational collapse of supermassive stars (M ∼> 5× 10 M⊙) could be a cosmological source of γ-ray bursts. Supermassive stars could form as an intermediate step in the collapse of relativistic star clusters, or in supermassive clouds with inefficient cooling. Supermassive stars would be de-stabilized by the Feynman-Chandrasekhar instability and could collapse to black hole...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2020
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/staa763