4 citations · 6 across the 6 of their papers we have counts for
10 papers · 1 filter
Did supermassive black holes form by direct collapse?
Mitchell C. Begelman
Rapid infall of gas in the nuclei of galaxies could lead to the formation of black holes by direct collapse, without first forming stars. Black holes formed in this way would have…
GRB jets inside and outside the star: precursors and cosmological implications
D. Lazzati, M. Begelman, G. Ghirlanda +2
After many years of speculation, recent observations have confirmed the association of gamma-ray bursts with core-collapse supernova explosions from massive stars. This association…
On Multiwavelength Emission and Morphology of Large-Scale Quasar Jets
L. Stawarz, M. Sikora, M. Ostrowski +1
We propose that the knots of the large-scale jets in powerful radio sources represent moving and separate portions of the jet matter, with the excess kinetic power. This can explai…
Gamma-ray bursts from alternating-current jets
M. Sikora, M. C. Begelman, P. Coppi +1
We propose a gamma-ray burst scenario involving relativistic jets dominated by Poynting flux with alternating toroidal magnetic fields. Such a structure may arise naturally if the…
AGN Feedback Mechanisms
Mitchell C. Begelman
Accreting black holes can release enormous amounts of energy to their surroundings, in various forms. Such feedback may profoundly influence a black hole's environment. After brief…
Impact of AGNs on the Surrounding Medium
Mitchell C. Begelman
The time- and ensemble-averaged mechanical energy outputs of radio galaxies may be large enough to offset much of the cooling inferred from X-ray observations of galaxy clusters. B…