Peter L. Biermann

Blazars in Low-Luminosity and Radio-Weak AGN? (2007)

A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:

P. Padovani, M. Urry, Heino Falcke, Sera Marko, Peter L. Biermann

Abstract. Typical blazars seem to be associated with FR I and FR II radio galaxies and radio-loud quasars. However, what happens at lower powers? Do blazars exist in low-luminosity AGN or do they...

Cosmic rays (2007)

Peter L. Biermann, Richard G. Strom, Heino Falcke

(will be inserted by hand later) Your thesaurus codes are:

, Sera Marko 1 (2007)

Richard Schilizzi, Stuart Vogel, Francesco Paresce, Martin Elvis, Heino Falcke, Peter L. Biermann, ...

Sgr A*: observations, models, and imaging of the event horizon with VLBI

1 (2007)

Barbara Wiebel-sooth, Peter L. Biermann, Hinrich Meyer

Compiling all available data from the literature we present a spectral powerlaw fit to cosmic ray electrons above 10 GeV. We compare with the model proposed by Biermann for the origin of cosmic rays;...

1 (2007)

Barbara Wiebel-sooth, Peter L. Biermann, Hinrich Meyer

Compiling all available data from the literature we present spectral powerlaw fits above 10 \Delta Z GeV for all individual elements from charge Z = 1 to 28. We compare with the model proposed by...

CosmicRays (2007)

Vii Individual, Barbara Wiebel-sooth, Peter L. Biermann, Hinrich Meyer

this paper we will at first briefly discuss the error determination of the theory in Sect. 2, then the data for individual elements in Sect. 3, compare and discuss secondary elements versus primary...

Galactic jet sources and the AGN connection (2007)

The Missing X-Rays in Sgr A*: Evidence for a Supermassive Black Hole in the Galactic Center (2007)

. In order to further test our hypothesis that jets and disk around compact accreting objects are symbiotic features we investigate the newly discovered superluminal galactic radio jets GRS 1915+105...

The Jet-Disk Symbiosis (2007)

: We present a simple argument that the missing x-ray flux from the Galactic Center source Sgr A* ist not evidence against -- as claimed by Goldwurm et al. 1994 -- but rather indirect evidence for...

Ii Interpreting, Heino Falcke, Matthew A. Malkan, Peter L. Biermann

. We investigate the correlation between the accretion disk (UV) luminosity and the radio core emission of a quasar sample, containing all PG quasars, also deriving empirical conversion factors from...

Unified schemes for active galaxies: a clue from the missing Fanaroff-Riley type I quasar population (2007)

What the radio cores in GRS 1915+105, NGC 4258, M81, and Sgr A tell us about accreting black holes (2007)

. We link the lack of FR I type structure among quasars to the void of radio loud quasars below a critical disk luminosity of ¸ 10 46 erg/sec in the PG sample. We argue that the opening angle of the...

The Nature of the 10 Kilosecond X-ray Flare in Sgr A* (2007)

. We have derived simplified equations for a freely expanding, pressure driven jet model as a function of jet power and applied it successfully to the radio cores in the black hole candidates GRS...

Sera Markoff, Heino Falcke, Feng Yuan, Peter L. Biermann

The X-ray mission Chandra has observed a dramatic X-ray are { a brightening by a factor of 50 for only three hours { from Sgr A*, the Galactic Center supermassive black hole. Sgr A* has never shown...

Sterile neutrinos and structure formation (2007)

Stasielak, Jaroslaw, Biermann, Peter L., Kusenko, Alexander

Warm dark matter is consistent with the observations of the large-scale structure, and it can also explain the cored density profiles on smaller scales. However, it has been argued that warm dark...

The spin-flip phenomenon in supermassive black hole binary mergers (2007)

Gergely, László Á., Biermann, Peter L.

Massive merging black holes will be the primary sources of powerful gravitational waves at low frequency, and will permit to test General Relativity with candidate galaxies close to a binary black...

Origin and physics of the highest energy cosmic rays: What can we learn from Radio Astronomy? (2007)

Biermann, Peter L., Isar, P. Gina, Maris, Ioana C., Munyaneza, Faustin, Tascau, Oana

Here in this lecture we will touch on two aspects, one the new radio methods to observe the effects of high energy particles, and second the role that radio galaxies play in helping us understand...

The Nature of Dark Matter (2007)

Biermann, Peter L., Munyaneza, Faustin

Dark matter has been recognized as an essential part of matter for over 70 years now, and many suggestions have been made, what it could be. Most of these ideas have centered on Cold Dark Matter,...

Dark Matter and Sterile Neutrinos (2007)

Biermann, Peter L., Munyaneza, Faustin

Dark matter has been recognized as an essential part of matter for over 70 years now, and many suggestions have been made, what it could be. Most of these ideas have centered on Cold Dark Matter,...

Thermal and chemical evolution of the primordial clouds in warm dark matter models with keV sterile neutrinos in one-zone approximation (2007)

Stasielak, Jaroslaw, Biermann, Peter L., Kusenko, Alexander

We follow the evolution of the baryonic top-hat overdensity in a single-zone approximation. Our goal is to juxtapose the evolution of the gas temperature in the primordial clouds in the lambda cold...

Degenerate sterile neutrino dark matter in the cores of galaxies (2006)

Munyaneza, Faustin, Biermann, Peter L.

We study the distribution of fermionic dark matter at the center of galaxies using NFW, Moore and isothermal density profiles and show that dark matter becomes degenerate for particle masses of a few...

Astrophysical implications of high energy neutrino limits (2006)

Becker, Julia K., Gross, Andreas, Muenich, Kirsten, Dreyer, Jens, Rhode, Wolfgang, Biermann, Peter L.

Second generation high energy neutrino telescopes are being built to reach sensitivities of neutrino emission from galactic and extragalactic sources. Current neutrino detectors are already able to...

Thermal evolution of the primordial clouds in warm dark matter models with keV sterile neutrinos (2006)

Stasielak, Jaroslaw, Biermann, Peter L., Kusenko, Alexander

We analyze the processes relevant for star formation in a model with dark matter in the form of sterile neutrinos. Sterile neutrino decays produce an X-ray background radiation that has a two-fold...

Relic keV sterile neutrinos and reionization (2005)

Biermann, Peter L., Kusenko, Alexander

A sterile neutrino with mass of several keV can account for cosmological dark matter, as well as explain the observed velocities of pulsars. We show that X-rays produced by the decays of these relic...

Ultra High Energy Cosmic Rays from Sequestered X Bursts (2005)

Biermann, Peter L., Frampton, Paul H.

Assuming that there is no GZK (Greisen-Zatsepin-Kuzmin) cut-off and that super-GZK cosmic rays correlate with AGN (Active Galactic Nuclei) at cosmological distances, it is speculated that a relic...

Dark energy - dark matter - and black holes: The music of the universe (2005)

Jets Driven by Accretion Onto Spinning Black Holes (2005)

Here we review the recent evidence for dark energy, dark matter and black holes as components of an expanding universe, for the vantage point of a non-expert; we speculate on a specific DM particle.

Dutan, Ioana, Biermann, Peter L.

We present a theoretical model for driving jets by accretion onto Kerr black holes and try to give an answer to the following question: How much energy could be extracted from a rotating black hole...

The diffuse neutrino flux from FR-II radio galaxies and blazars: A source property based estimate (2005)

Becker, Julia K., Biermann, Peter L., Rhode, Wolfgang

Water and ice Cherenkov telescopes of the present and future aim for the detection of a neutrino signal from extraterrestrial sources at energies E>PeV. Some of the most promising extragalactic...

Sources of Cosmic Rays and Galactic Diffuse Gamma Radiation (2004)

Casanova, Sabrina, Biermann, Peter L., Engel, Ralph, Meli, Athina, Ulrich, Ralf

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 different kind of...

Fast Growth of Supermassive Black Holes in Galaxies (2004)

Munyaneza, Faustin, Biermann, Peter L.

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 matter halos are...

Brightness suppression of relativistic radio jets of quasars: The role of the lower electron energy cut-off (2004)

Biermann, Peter L., Wiita, Paul J.

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 in the literature,...

The last Gamma Ray Burst in our Galaxy? On the observed cosmic ray excess at particle energy 1 EeV (2004)

Biermann, Peter L., Tanco, Gustavo Medina, Engel, Ralph, Pugliese, Giovanna

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 few Gamma Ray Bursts...

Cosmic rays, stellar evolution, and supernova physics (2003)

The Origin of X-shaped Radio Galaxies: Clues from the Z-symmetric Secondary Lobes (2003)

Most cosmic rays are thought to be accelerated by the shocks of supernova explosions of very massive stars. Here we review one quantitative proposal, which predicted the spectral slopes, bend and...

Biermann, Peter L., Wiita, Paul J.

Existing radio images of a few X-shaped radio galaxies reveal Z-symmetric morphologies in their weaker secondary lobes which cannot be naturally explained by either the galactic merger or radio-lobe...

Cosmic Rays from PeV to ZeV, Stellar Evolution, Supernova Physics and Gamma Ray Bursts (2003)

Biermann, Peter L., Moiseenko, Sergej, Ter-Antonyan, Samvel, Vasile, Ana

The recent success of a proposal from some time ago to explain the spectrum of cosmic rays allows some strong conclusions to be made on the physics of supernovae: In the context of this specific...

Origin of Cosmic Magnetic Fields (2003)

Biermann, Peter L., Galea, Cristina F.

We propose that the overlapping shock fronts from young supernova remnants produce a locally unsteady, but globally steady large scale spiral shock front in spiral galaxies, where star formation and...

Ultra high energy cosmic ray sources & experimental results (2003)

Biermann, Peter L., Medina-Tanco, Gustavo

Here we discuss the latest developments in the debate, where the ultrahigh energy cosmic ray particles come from. In this brief review, we emphasize the predictions that necessarily follow from the...

Single and binary Black Holes and their active environment (2002)

Biermann, Peter L., Chirvasa, Mihaela, Falcke, Heino, Markof, Sera, Zier, Christian

In this short review we describe some of the latest endeavours to understand the activity around Black Holes. First, it has been possible to demonstrate that a large part of the electromagnetic...

Cosmic Rays in Clusters of Galaxies (2002)

Biermann, Peter L., Enßlin, Torsten A., Kang, Hyesung, Lee, Hyesook, Ryu, Dongsu

We argue that clusters of galaxies have an intergalactic medium, which is permeated by strong magnetic fields and also has a contribution of pressure from cosmic rays. These two components of total...

NGC4258: a jet-dominated low-luminosity AGN? (2002)

Yuan, Feng, Markoff, Sera, Falcke, Heino, Biermann, Peter L.

Low-luminosity AGNs (LLAGNs) are a very important class of sources since they occupy a significant fraction of local galaxies. Their spectra differ significantly from the canonical luminous AGNs,...

Binary black holes and tori in AGN II. Can stellar winds constitute a dusty torus? (2002)

Zier, Christian, Biermann, Peter L.

We determine the properties of the stellar torus that we showed in a previous paper to result as a product of two merging black holes. If the surrounding stellar cluster is as massive as the binary...

The Nature of the 10 Kilosecond X-ray Flare in Sgr A* (2001)

Markoff, Sera, Falcke, Heino, Yuan, Feng, Biermann, Peter L.

The X-ray mission Chandra has observed a dramatic X-ray flare -- a brightening by a factor of 50 for only three hours -- from Sgr A*, the Galactic Center supermassive black hole. Sgr A* has never...

Binary black holes and tori in AGN I. Ejection of stars and merging of the binary (2001)

Zier, Christian, Biermann, Peter L.

Most galaxies have central massive black holes (BH), and merge with others during their evolution, as strongly suggested by recent observations. Consequently a black hole binary (BHB) emerges....

Gamma-ray Emission from Jets in Galactic Microquasars (2001)

Sera Markoff, Heino Falcke, Rob Fender, Peter L. Biermann

Strong evidence exists for the presence of powerful jets in the Low/Hard state of black hole candidate X-ray binaries, earning them the additional nomenclature "microquasars ". In several...

Signatures in a Giant Radio Galaxy of a Cosmological Shock Wave at Intersecting Filaments of Galaxies (2000)

Ensslin, Torsten A., Simon, Patrick, Biermann, Peter L., Klein, Ulrich, Kohle, Sven, Kronberg, Philipp P., ...

Sensitive images of low-level, Mpc-sized radio cocoons offer new opportunities to probe large scale intergalactic gas flows outside clusters of galaxies. New radio images of high surface brightness...

Blazars in Low-Luminosity and Radio-Weak AGN? (2000)

Falcke, Heino, Markoff, Sera, Biermann, Peter L.

Typical blazars seem to be associated with FR I and FR II radio galaxies and radio-loud quasars. However, what happens at lower powers? Do blazars exist in low-luminosity AGN or do they exist in...

A Note on Hydrodynamic Viscosity and Selfgravitation in Accretion Disks (2000)

Duschl, Wolfgang J., Strittmatter, Peter A., Biermann, Peter L.

We propose a generalized accretion disk viscosity prescription based on hydrodynamically driven turbulence at the critical effective Reynolds number. This approach is consistent with recent...

Effects of galaxy mergers on the faint IRAS source counts and the background (2000)

Wang, Yiping, Biermann, Peter L.

Binary merging constitutes a complementary mode of galaxy evolution to the canonical hierarchical clustering theory. This merger-driven evolution not only influences the galaxy mass distribution...

Signatures for a Cosmic Flux of Magnetic Monopoles (2000)

Wick, Stuart D., Kephart, Thomas W., Weiler, Thomas J., Biermann, Peter L.

Any early universe phase transition occurring after inflation has the potential to populate the universe with relic magnetic monopoles. Observations of galactic magnetic fields, as well as...

A jet-disk symbiosis model for Gamma Ray Bursts: fluence distribution, CRs and $\nu$'s (1999)

Pugliese, Giovanna, Falcke, Heino, Wang, Yiping, Biermann, Peter L.

We consider a jet-disk symbiosis model to explain Gamma Ray Bursts and their afterglows. It is proposed that GRBs are created inside a pre-existing jet from a neutron star in a binary system which...

The origin of the highest energy cosmic rays Do all roads lead back to Virgo? (1999)

Ahn, Eun-Joo, Medina-Tanco, Gustavo, Biermann, Peter L., Stanev, Todor

Introducing a simple Galactic wind model patterned after the solar wind we show that back-tracing the orbits of the highest energy cosmic events suggests that they may all come from the Virgo...

A jet-disk symbiosis model for Gamma Ray Bursts: SS 433 the next? (1999)

Pugliese, Giovanna, Falcke, Heino, Biermann, Peter L.

We consider a jet-disk symbiosis model to explain Gamma Ray Bursts and their afterglows. It is proposed that GRBs develop in a pre-existing jet. We consider a binary system formed by a neutron star...

Reply to "Comment on `Correlation between Compact Radio Quasars and Ultra-High Energy Cosmic Rays'" (1999)

Farrar, Glennys R., Biermann, Peter L.

We discuss the rationale for the energy cuts used in the previous study of directional correlation of the five highest energy cosmic ray events with compact, radio quasars. We check the consistency...

Cosmic Rays in the Galactic Center Region (1998)

Rhode, Wolfgang, Ensslin, Torsten A., Biermann, Peter L.

EGRET data on the Gamma ray emission from the inner Galaxy have shown a rather flat spectrum, extending to about 50 GeV. It is usually assumed that these gamma-rays arise from the interactions of...

The jet/disk symbiosis III. What the radio cores in GRS 1915+105, NGC 4258, M81, and Sgr A tell us about accreting black holes (1998)

Non-thermal Origin of the EUV and HEX Excess Emission of the Coma Cluster - the Nature of the Energetic Electrons (1998)

We have derived simplified equations for a freely expanding, pressure driven jet model as a function of jet power and applied it successfully to the radio cores in the black hole candidates GRS...

Ensslin, Torsten A., Lieu, Richard, Biermann, Peter L.

The excess in extreme-ultraviolet (EUV) radiation and high energy X-rays (HEX) of Coma may be modeled by power law spectra. Their origin could be inverse Compton (IC) emission by relativistic...

Correlation between Compact Radio Quasars and Ultra-High Energy Cosmic Rays (1998)

Farrar, Glennys R., Biermann, Peter L.

Some proposals to account for the highest energy cosmic rays predict that they should point to their sources. We study the five highest energy events (E>10^20 eV) and find they are all aligned with...

Shock Waves of the Large-Scale Structure Formation in the Universe (1998)

Ensslin, Torsten A., Biermann, Peter L., Klein, Ulrich, Kohle, Sven

Simulations of structure formation in the Universe predict accretion shock waves at the boundaries of the large-scale structures as sheets, filaments, and clusters of galaxies. If magnetic fields are...

Angular Momentum Transport in the Central Region of the Galaxy (1998)

Ozernoy, Leonid M., Fridman, Alexei M., Biermann, Peter L.

We discuss mechanisms for angular momentum transport in the clumpy medium of the circumnuclear disk at the Galactic center. The viscosity due to clump-clump collisions is found to be less than some...

Black hole energy release to the Gaseous Universe (1998)

Ensslin, Torsten A, Nath, Biman B., Biermann, Peter L.

We estimate the energy release of black hole formation to the intra-cluster medium of the Coma cluster and find that this is comparable to the present day energy content. Therefore an energetic and...

Cosmic Magnetic Fields in Large Scale Filaments and Sheets (1998)

Ryu, Dongsu, Kang, Hyesung, Biermann, Peter L.

We consider the possibility that cosmic magnetic field, instead of being uniformly distributed, is strongly correlated with the large scale structure of the universe. Then, the observed rotational...

Black Hole Energy Release to the Gaseous Universe (1998)

Ensslin, Torsten A., Wang, Yiping, Nath, Biman B., Biermann, Peter L.

We estimate the energy release of black hole formation to the intra-cluster medium of the Coma cluster and find that this is comparable to the present day energy content. Therefore an energetic and...

A possible mechanism for the mass ratio limitation in early type galaxies (1998)

Wang, Yiping, Biermann, Peter L.

There is an interesting correlation between the central objects and their host galaxies in recent high resolution HST photometry of early type galaxies and Near-IR images of nearby quasar hosts. It...

Cluster Radio Relics as a Tracer of Shock Waves of the Large-Scale Structure Formation (1997)

Ensslin, Torsten A., Biermann, Peter L., Klein, Ulrich, Kohle, Sven

We present evidence for the existence of shock waves caused by the formation of the large-scale structure. In some clusters of galaxies peripherally located sources of extended diffuse radio emission...

On the dynamo driven accretion disks (1997)

Ma, Chun-yu, Biermann, Peter L

We add the $\alpha-$ effect in the dynamo driven accretion disk model proposed by Tout & Pringle (1992), i.e., a dynamo model depends on the physical processes such as Parker instability,...

Frontiers of Astrophysics - Workshop Summary (1997)

Cosmic Rays VII. Individual element spectra: prediction and data (1997)

We summarize recent results presented in the astrophysics session during a conference on ``Frontiers of Contemporary Physics''. We will discuss three main fields (High-Energy Astrophysics,...

Wiebel-Sooth, Barbara, Biermann, Peter L., Meyer, Hinrich

Based on the earlier papers in this series, we discuss here the errors in the prediction of the model, and compare with the error ranges in the spectra for individual elements. The predictions are...

The supergalactic structure and the origin of the highest energy cosmic rays (1997)

Biermann, Peter L., Kang, Hyesung, Ryu, Dongsu

The recent discoveries of several reliable events of high energy cosmic rays at an energy above 10^20 eV raise questions about their path through the nearby universe. The two analyses of the Haverah...

Cosmic Structure of Magnetic Fields (1997)

Biermann, Peter L., Kang, Hyesung, Rachen, Joerg P., Ryu, Dongsu

The simulations of the formation of cosmological structure allows to determine the spatial inhomogeneity of cosmic magnetic fields. Such simulations, however, do not give an absolute number for the...

Limits on Magnetic Fields and Relativistic Electrons in the Coma Cluster from Multifrequency Observations (1997)

Ensslin, Torsten A., Biermann, Peter L.

Relativistic electrons, seen in the large diffuse radio halo of the Coma cluster of galaxies, should scatter background photons to higher energies. We calculate the inverse Compton contributions from...

Unstable waves in winds of magnetic massive stars (1997)

Seemann, Henning, Biermann, Peter L.

We use a luminous fast magnetic rotator model to analyze the influence of a magnetic field on the linear waves induced in the wind of a massive star by the radiative instability. We show that a...

Workshop on High-energy Cosmic Neutrinos : Origin, Production and Detection (1997)

Aubert, Jean-Jacques, Biermann, Peter L, Collin, S, Ellis, Jonathan Richard

Viscosity in Selfgravitating Accretion Disks (1997)

Duschl, W. J., Strittmatter, Peter A., Biermann, Peter L.

We show that the standard model for geometrically thin accretion disks (alpha-disks) leads to inconsistencies if selfgravity plays a role. This problem arises from the parametrization of viscosity in...

Cosmic Ray Interactions and the Abundances of the Chemical Elements (1996)

Contributions to the Cosmic Ray Flux above the Ankle: Clusters of Galaxies (1996)

Our Galaxy is the largest nuclear interaction experiment which we know, because of the interaction between cosmic ray particles and the interstellar material. Cosmic rays are particles, which have...

Kang, Hyesung, Rachen, Jörg P., Biermann, Peter L.

Motivated by the suggestion of Kang, Ryu \& Jones (1996) that particles can be accelerated to high energies via diffusive shock acceleration process at the accretion shocks formed by the infalling...

The symbiotic system in quasars: black hole, accretion disk and jet (1996)

Donea, Alina-Catalina, Biermann, Peter L.

The UV continuum spectrum of quasars and AGN is assumed to originate from an accreting disk surrounding a massive rotating black hole. We discuss the structure and emission spectra of a disk which...

Contributions To The Cosmic Ray Flux Above The Ankle: Clusters Of Galaxies (1996)

Hyesung Kang, Jörg P. Rachen, Peter L. Biermann

Assuming that particles can be accelerated to high energies via diffusive shock acceleration process at the accretion shocks formed by the infalling flow toward the clusters of galaxies, we have...

The missing x-rays in Sgr A*: evidence for - not against - a supermassive black hole (1995)

ROSAT PSPC observations of six PG quasars and PHL 1657 (1995)

We present a simple argument that the missing x-ray flux from the Galactic Center source Sgr~A* ist not evidence {\it against} -- as claimed by Goldwurm et al. 1994 -- but rather indirect evidence...

Rachen, Joerg P., Mannheim, Karl, Biermann, Peter L.

We report results from the spectral analysis of pointed ROSAT PSPC observations of six PG quasars and the weak-bump quasar PHL 1657. Disregarding other frequency bands, the PSPC data are represented...

Cosmic rays V. The nonthermal radio emission of the old nova GK Per - a signature of hadronic interactions? (1995)

Biermann, Peter L., Strom, Richard G., Falcke, Heino

Using the model of particle acceleration in shocks in stellar winds developed by Biermann (1993) and Biermann and Cassinelli (1993) we demonstrate that the nonthermal radio emission spectrum from the...

Galactic jet sources and the AGN connection (1995)

SUPERNOVA BLASTWAVES AND PRE-SUPERNOVA WINDS: THEIR COSMIC RAY CONTRIBUTION (1995)

In order to further test our hypothesis that jets and disk around compact accreting objects are symbiotic features we investigate the newly discovered superluminal galactic radio jets GRS 1915+105...

The origin of cosmic rays (1995)

Supernova explosions into predecessor stellar winds can lead to particle acceleration, which we suggest can explain most of the observed cosmic rays of the nuclei of Helium and heavier elements, from...

THE ORIGIN OF COSMIC RAYS (1995)

The search for the origin of cosmic rays is a quest of almost a hundred years. A recent theoretical proposal gives quantitative predictions, which can be tested with data. Specifically, it has been...

The Origin of Galactic Cosmic Rays (1995)

We propose that cosmic rays originate mainly in three sites, a) normal supernova explosions into the interstellar medium, b) supernova explosions into stellar winds, and c) hot spots of powerful...

Biermann, Peter L., Gaisser, T. K., Stanev, Todor

Motivated by recent measurements of the major components of the cosmic radiation around 10 TeV/nucleon and above, we discuss the phenomenology of a model in which there are two distinct kinds of...

Unified schemes for active galaxies: a clue from the missing Fanaroff-Riley type I quasar population (1994)

The jet-disk symbiosis. II. Interpreting the Radio/UV correlations in quasars (1994)

We link the lack of FR I type structure among quasars to the void of radio loud quasars below a critical disk luminosity of ~10^46 erg/sec in the PG sample. We argue that the opening angle of the...

Falcke, Heino, Malkan, Matthew A., Biermann, Peter L.

We investigate the correlation between the accretion disk (UV) luminosity and the radio core emission of a quasar sample. In a radio/$L_{\rm disk}$ plot we find the quasars to be separated into four...

The jet-disk symbiosis. I. Radio to X-ray emission models for quasars (1994)

Gamma Line Radiation Emission from Stellar Winds in Orion Complex: A test for cosmic ray origin theory (1994)

Starting from the assumption that radio jets and accretion disks are symbiotic features present in radio loud and radio quiet quasars we scale the bulk power of radio jets with the accretion power by...

Nath, Biman B., Biermann, Peter L.

We consider $\gamma$-ray emission from heavy nuclei that are accelerated in the shocks of stellar winds and are excited in interactions with the ambient matter in the Orion complex. We show that the...

Cosmic ray ionization of the interstellar medium (1993)

Nath, Biman B., Biermann, Peter L.

We consider a cosmic ray spectrum that is a power law in momentum down to a cutoff and derive a lower cutoff corresponding to $E_{kin} \sim (30-60)$ MeV from the observed ionization rates in nearby...

The Galactic Center radio jet (1993)

Falcke, Heino, Mannheim, Karl, Biermann, Peter L.

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 structure at 43 GHz and...

The Galactic Center - an AGN on a starvation diet (1993)

Our Galactic Center: A laboratory for the feeding of AGNs? (1993)

The Galactic Center shows evidence for the presence of three important AGN ingredients: a Black Hole ($M_\bullet\sim10^6M_\odot$), an accretion disk ($10^{-8.5} - 10^{-7} M_\odot/{\rm yr}$) and a...

Von Linden, Susanne, Biermann, Peter L., Duschl, Wolfgang J., Lesch, Harald, Schmutzler, Thomas

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 field of molecular...

The emission spectra of radioweak quasars. I. The farinfrared emission (1993)

Niemeyer, Martina, Biermann, Peter L.

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 particles. These...

Did Cosmic Rays Reionize the Intergalactic Medium? (1993)

Nath, Biman B., Biermann, Peter L.

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 $60 \mu m$, we estimate the cosmic...

Molecular Clouds Close to the Galactic Center (1993)

Biermann, Peter L., Duschl, Wolfgang J., Von Linden, Susanne

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 Center (10 ... 100...

Cosmic Rays, II. Evidence for a magnetic rotator Wolf Rayet star origin (1993)

Biermann, Peter L., Cassinelli, Joseph P.

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 Wolf Rayet stars can...

AGN and galactic sites of cosmic ray origin (1993)

Cosmic Rays, III. The CR spectrum between 1 GeV and 10^4 GeV and the radio emission from supernova remnants (1993)

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 the jets and radio...

Biermann, Peter L., Strom, Richard G.

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 particles are...

Extragalactic ultra high energy cosmic rays, II. Comparison with experimental data (1993)

Rachen, Joerg P., Stanev, Todor, Biermann, Peter L.

We compare the expected contribution of FR-II hot spots to the ultra-high energy cosmic ray spectrum (Rachen & Biermann 1993, A&A in press, BB paper astro-ph/9301010) to improved experimental...

Extragalactic ultra high energy cosmic rays, I. Contribution from hot spots in FR-II galaxies (1993)

Rachen, Joerg P., Biermann, Peter L.

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 maximum energy in the hot...

Cosmic Rays I.: The cosmic ray spectrum between 10 TeV and 3 EeV (1993)