Hypercritical Advection‐dominated Accretion Flow
نویسندگان
چکیده
منابع مشابه
Hypercritical Advection Dominated Accretion Flow
In this note we study the accretion disc that arises in hypercritical accretion of Ṁ ∼ 10 MEdd onto a neutron star while it is in common envelope evolution with a massive companion. Such a study was carried out by Chevalier (1996), who had earlier suggested that the neutron star would go into a black hole in common envelope evolution. In his later study he found that the accretion could possibl...
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Hypercritical accretion flows onto stellar mass black holes (BHs) are commonly considered as a promising model of central engines of gamma-ray bursts (GRBs). In this model a certain fraction of gravitational binding energy of accreting matter is deposited to the energy of relativistic jets via neutrino annihilation and/or magnetic fields. However, some recent studies have indicated that the ene...
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Stationary spherical accretion onto black holes is certainly a well–known and extensively studied topic (for a comprehensive review see Nobili, Turolla and Zampieri , Zampieri, Miller and Turolla ). Up to now all time–dependent investigations of spherical accretion have been concerned either with the analysis of the stability of isothermal , isentropic 4 and optically thick 6 flows or with the ...
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The spin parameter of the black hole in M33 X−7 has recently been measured to be a⋆ = 0.77±0.05 (Liu et al. 2008). It has been proposed that the spin of the 15.65M⊙ black hole is natal. We show that this is not a viable evolutionary path given the observed binary orbital period of 3.45 days since the explosion that would produce a black hole with the cited spin parameter and orbital period woul...
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We consider a black hole accreting spherically from the surrounding medium. If accretion produces a luminosity close to the Eddington limit the hole acquires a net charge so that electrons and ions can fall with the same velocity. The condition for the electrostatic field to be large enough to break the vacuum near the hole horizon translates into an upper limit for the hole mass, M ∼ 6.6 × 10 ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/309454