409 citations · 9.6k across the 232 of their papers we have counts for
11 papers · 2 filters
Cosmic ray ionization of the interstellar medium
Biman B. Nath, Peter L. Biermann
We consider a cosmic ray spectrum that is a power law in momentum down to a cutoff and derive a lower cutoff corresponding to MeV from the observed ionizatio…
The Galactic Center radio jet
Heino Falcke, Karl Mannheim, Peter L. Biermann
Recent observations of the radio and NIR source Sgr A* reinforce the interpretation of the Galactic Center as a scaled down version of an AGN. The discovery of an elongated structu…
Our Galactic Center: A laboratory for the feeding of AGNs?
Susanne von Linden, Peter L. Biermann, Wolfgang J. Duschl +2
We demonstrate that our Galactic Center, despite little evidence for the presence of a currently active nucleus, provides insight into the feeding of AGN: The observed velocity fie…
The emission spectra of radioweak quasars. I. The farinfrared emission
Martina Niemeyer, Peter L. Biermann
We model farinfrared (FIR) spectra of radioweak quasars with the assumption that the emission is from heated dust, and that the heating is due to the central engine via energetic p…
Did Cosmic Rays Reionize the Intergalactic Medium?
Biman B. Nath, Peter L. Biermann
We investigate the role of cosmic rays from young galaxies in heating and ionizing the intergalactic medium (IGM) at high redshift. Using the IRAS observations at , we estim…
Molecular Clouds Close to the Galactic Center
Peter L. Biermann, Wolfgang J. Duschl, Susanne von Linden
We demonstrate that the accretion disk model for the Galactic Center region by Linden et al (1993a) is applicable for at least one order of magnitude in radius from the Galactic Ce…
AGN and galactic sites of cosmic ray origin
Peter L. Biermann
We review recent progress in our understanding of the physics of energetic particles in our Galaxy, in active galaxies such as starburst galaxies, in active galactic nuclei and in…
Cosmic Rays, II. Evidence for a magnetic rotator Wolf Rayet star origin
Peter L. Biermann, Joseph P. Cassinelli
Based on 1) a conjecture about the mean free path for particle scattering in perpendicular shock geometries, and 2) a model for Wolf Rayet star winds, we argue that explosions of W…
Cosmic Rays, III. The CR spectrum between 1 GeV and 10^4 GeV and the radio emission from supernova remnants
Peter L. Biermann, Richard G. Strom
We develop a theory to account for the cosmic ray spectrum between 1 GeV and 10^4 GeV following the earlier papers of this series. We use the basic concept that the cosmic ray part…
Cosmic Rays IV. The spectrum and chemical composition above GeV
T. Stanev, P. L. Biermann, T. K. Gaisser
Using the concept developed in earlier papers, that the cosmic rays originate in three different main sites, a) the normal supernova explosions into the interstellar medium, b) the…
Extragalactic ultra high energy cosmic rays, I. Contribution from hot spots in FR-II galaxies
Joerg P. Rachen, Peter L. Biermann
We consider the hot spots in FR-II galaxies as sites of first order Fermi acceleration of protons to the highest energies observed in cosmic rays. We estimate the attainable maximu…