409 citations · 9.6k across the 232 of their papers we have counts for
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The Efficiency of Using Accretion Power of Kerr Black Holes
Ioana Dutan, Peter Biermann
The efficiency of a rapidly spinning Kerr black hole to turn accretion power into observable power can attain 32 percent for the photon emission from the disk, as is well known, fo…
Sources of Cosmic Rays and Galactic Diffuse Gamma Radiation
Sabrina Casanova, Peter L. Biermann, Ralph Engel +2
The diffuse galactic gamma-ray spectrum measured by the EGRET experiment \citep{Hunter:1997} are interpreted within a scenario in which cosmic rays (CRs) are injected by three diff…
Fast Growth of Supermassive Black Holes in Galaxies
Faustin Munyaneza, Peter L. Biermann
We report on a calculation of the growth of the mass of supermassive black holes at galactic centers from dark matter and Eddington - limited baryonic accretion. Assuming that dark…
Brightness suppression of relativistic radio jets of quasars: The role of the lower electron energy cut-off
Gopal-Krishna, Peter L. Biermann, Paul J. Wiita
Although the possibility of a low energy cut-off (LEC) of the relativistic electron population (E_{min} ~ 0.1 GeV) in the different components of radio galaxies has been discussed…
The last Gamma Ray Burst in our Galaxy? On the observed cosmic ray excess at particle energy 1 EeV
Peter L. Biermann, Gustavo Medina-Tanco, Ralph Engel +1
Here we propose that the excess flux of particle events of energy near 1 EeV from the direction of the Galactic Center region is due to the production of cosmic rays by the last fe…