1.4k citations · 12.6k across the 141 of their papers we have counts for
10 papers · 1 filter
Thick fireballs and the steep decay in the early X-ray afterglow of gamma-ray bursts
Davide Lazzati, Mitchell C. Begelman
We study the early afterglows of gamma-ray bursts produced by geometrically thick fireballs, following the development of the external shock as energy is continually supplied to th…
Are Quasar Jets Matter or Poynting Flux Dominated?
Marek Sikora, Greg M. Madejski, Jean-Pierre Lasota +1
If quasar jets are accelerated by magnetic fields but terminate as matter dominated, where and how does the transition occur between the Poynting-dominated and matter-dominated reg…
Nonlinear Photon Bubbles Driven by Buoyancy
Mitchell C. Begelman
We derive an analytic model for nonlinear "photon bubble" wave trains driven by buoyancy forces in magnetized, radiation pressure-dominated atmospheres. Continuous, periodic wave s…
Self-regulated black hole accretion, the M-sigma relation, and the growth of bulges in galaxies
Mitchell C. Begelman, Biman B. Nath
We argue that the velocity dispersions and masses of galactic bulges and spheroids are byproducts of the feedback that regulates rapid black hole growth in protogalaxies. We sugges…
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…
Cyclotron Maser Emission from Blazar Jets?
Mitchell C. Begelman, Robert E. Ergun, Martin J. Rees
We consider the production of electron cyclotron maser emission by low-density, highly magnetized plasmas in relativistic jets. The population inversion required to drive cyclotron…