Is there an upper limit to the accretion rate [(M)\\\dot]{\\\dot M} , preventing astrophysical black holes to swallow all the matter infalling into them? Many astrophysicists are convinced that the answer to this fundamental question should be: yes, the limit exist and it is given by...
on average, both black hole accretion and star formation grow at similar rates, perhaps related to how material flow into the respective regions. X-ray data from the Chandra X-ray Observatory are
Several black hole X-ray transients have a very long recurrence time, decades of years [2]. We interpret this as a marginal occurrence of a dwarf nova type disk instability in the cool outer accretion disk. We compute how the recurrence time varies with the mass overflow rate from the ...
The properties of the inner edge of the disk are important in determining the efficiency of the accretion disk. We define the efficiency of the disk, η, by L=ηṀc2, where Ṁ is the mass accretion rate onto the black hole and L is the total power output of the accretion disk (...
For example, early CMB constraints on PBHs [21] were found to rely on an overly optimistic model for the black hole accretion rate [22] and continue to be updated as our understanding of accretion improves [23]. Similarly, uncertainty in the modeling of the PBH merger rate has led to ...
The star Cygnus X-1 is a strong X-ray source and is considered to be a good candidate for a black hole. Stellar winds from the companion star, HDE 226868, blow material onto the accretion disk surrounding the black hole. As this material falls into the black hole, it emits X-rays. ...
A newly formed black hole may be directly identified if late-time accretion of material from the base of the ejected envelope generates a luminosity that is observable in the tail of the supernova light curve. In this work we estimate the rate at which events where the black hole ``emerges...
Charged Kiselev black holeaccretionAccretion of matter onto a compact is one of the interesting astrophysical processes. Here, we study the accretion of matter onto a charged Kiselev black hole. The problem of static and spherically symmetric accretion of a polytropic fluid is explored for the ...
Motivated by new development in string theory, we study the black hole accretion process both analytically and numerically on non-commutative geometry. We consider stationary, spherically symmetric accretion of a polytropic fluid. Generalised expressions for the accretion rate $\\dot{M}$, critical ...
[21]were found to rely on an overly optimistic model for the black hole accretion rate[22]and continue to be updated as our understanding of accretion improves[23]. Similarly, uncertainty in the modeling of thePBH mergerrate has led to several revisions of the bounds fromgravitational wave...