Razzaque, Soebur, Dermer, Charles D., Finke, Justin D.
Fermi gamma-ray telescope data of GRB 080916C with ~1e55 erg in apparent isotropic gamma-ray energy, show a several second delay between the rise of 100 MeV - GeV radiation compared with keV - MeV...
Modeling the Extragalactic Background Light from Stars and Dust (2009)
Finke, Justin D., Razzaque, Soebur, Dermer, Charles D.
The extragalactic background light (EBL) from the far infrared through the visible and extending into the ultraviolet is thought to be dominated by starlight, either through direct emission or...
Observational Consequences of GRBs as Sources of Ultra High Energy Cosmic Rays (2009)
Razzaque, Soebur, Dermer, Charles D., Finke, Justin D., Atoyan, Armen
Gamma-ray bursts (GRBs) have long been considered as candidates of ultrahigh-energy cosmic rays (UHECRs). We investigate the signatures of CR proton acceleration in the GRBs by consistently taking...
Razzaque, Soebur, Mena, Olga, Dermer, Charles D.
Protons accelerated in the internal shocks of a long duration gamma ray burst can escape the fireball as cosmic rays by converting to neutrons. Hadronic interactions of these neutrons inside a...
Black-Hole Engine Kinematics, Flares from PKS 2155-304, and Multiwavelength Blazar Analysis (2008)
Dermer, Charles D., Finke, Justin D., Menon, Govind
Kinematical and luminosity relations for black-hole jet sources are reviewed. If the TeV flares observed from PKS 2155-304 in 2006 July are assumed to originate from a black hole with mass $\approx...
Gamma Ray Bursts and the Fermi Gamma Ray Space Telescope: Notes to the La Plata Lectures (2008)
Dermer, Charles D., Fryer, Chris L.
Gamma-ray bursts (GRBs) are a mixed class of sources consisting of, at least, the long duration and short-hard subclasses, the X-ray flashes, and the low-luminosity GRBs. In all cases, the release of...
Suzaku Observations of Local Ultraluminous Infrared Galaxies (2008)
Teng, Stacy H., Veilleux, Sylvain, Anabuki, Naohisa, Dermer, Charles D., Gallo, Luigi C., Nakagawa, Takao, ...
We report the results from our analysis of {\it Suzaku} XIS (0.5-10 keV) and HXD/PIN (15-40 keV) observations of five well-known local ULIRGs: {\em IRAS} F05189-2524, {\em IRAS} F08572+3915, Mrk 273,...
Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars (2008)
Dermer, Charles D., Finke, Justin D., Krug, Hannah, Boettcher, Markus
We extend a method for modeling synchrotron and synchrotron self-Compton radiations in blazar jets to include external Compton processes. The basic model assumption is that the blazar radio through...
Gamma Rays from Ultra-High Energy Cosmic Rays in Cygnus A (2008)
Atoyan, Armen, Dermer, Charles D.
Ultra-high energy cosmic rays (UHECRs) accelerated in the jets of active galactic nuclei can accumulate in high magnetic field, ~100 kpc-scale regions surrounding powerful radio galaxies....
Razzaque, Soebur, Dermer, Charles D., Finke, Justin D.
TeV gamma rays from distant astrophysical sources are attenuated due to electron-positron pair creation by interacting with ultraviolet/optical to infrared photons which fill the universe and are...
Gamma Ray Burst Predictions for GLAST (2008)
Le, Truong, Dermer, Charles D.
We develop a phenomenological model to estimate the GRB full-sky detection rate by GLAST. This estimate is based on the BATSE GRB fluence distribution, the average EGRET ($\gtrsim$100 MeV) to BATSE...
Boettcher, Markus, Dermer, Charles D., Finke, Justin D.
Observations of very-high-energy (VHE, E > 250 GeV) gamma-ray emission from several blazars at z > 0.1 have placed stringent constraints on the elusive spectrum and intensity of the intergalactic...
The obscured gamma-ray and UHECR universe (2008)
Auger results on clustering of > 60 EeV ultra-high energy cosmic ray (UHECR) ions and the interpretation of the gamma-ray spectra of TeV blazars are connected by effects from the extragalactic...
High Energy Emission from Starburst Galaxies and Clusters (2007)
Yoel Rephaeli, Charles D. Dermer
Abstract. Detection of diffuse high energy X-ray and fl-ray emission from starburst galaxies and clusters of galaxies will significantly advance the study of these systems. We review the results of...
The discoveries of the GZK cutoff with the HiRes and Auger Observatories and the discovery by Auger of clustering of >~60 EeV ultra-high energy cosmic rays (UHECRs) towards nearby
The Extragalactic Gamma Ray Background (2007)
One way to understand the nonthermal history of the universe is by establishing the origins of the unresolved and truly diffuse extragalactic gamma rays. Dim blazars and radio/gamma galaxies...
Gamma Ray Bursts in the Swift and GLAST Era (2007)
Le, Truong, Dermer, Charles D.
We summarize our model for long-duration gamma ray bursts (GRBs) that fits the redshift (z) distributions measured with Swift and missions before Swift, and the pre-Swift GRB jet opening-angle...
An analysis of the interaction between a spherical relativistic blast-wave shell and a stationary cloud with a spherical cap geometry is performed assuming that the cloud width 0, where Delta_0 +...
Best-Bet Astrophysical Neutrino Sources (2006)
Likely astrophysical sources of detectable high-energy (>> TeV) neutrinos are considered. Based on gamma-ray emission properties, the most probable sources of neutrinos are argued to be GRBs,...
External Shocks, UHECRs, and the Early Afterglow of GRBs (2006)
Highly variable gamma-ray pulses and X-ray flares in GRB light curves can result from external shocks rather than central engine activity under the assumption that the GRB blast-wave shell does not...
High-Energy Cosmology: gamma rays and neutrinos from beyond the galaxy (2006)
Our knowledge of the high-energy universe is undergoing a period of rapid change as new astronomical detectors of high-energy radiation start to operate at their design sensitivities. Now is a...
On the Redshift Distribution of Gamma Ray Bursts in the Swift Era (2006)
Le, Truong, Dermer, Charles D.
A simple physical model for long-duration gamma ray bursts (GRBs) is used to fit the redshift (z) and the jet opening-angle distributions measured with earlier GRB missions and with Swift. The effect...
Dermer, Charles D., Atoyan, Armen
Gamma-ray bursts (GRBs) are sources of energetic, highly variable fluxes of gamma rays, which demonstrates that they are powerful particle accelerators. Besides relativistic electrons, GRBs should...
GRB X-ray light curves display rapid declines followed by a gradual steepening or plateau phase in >~ 30% of GRBs in the Swift sample. Treating the standard relativistic blastwave model in a uniform...
Statistics of Cosmological Black Hole Jet Sources: Blazar Predictions for GLAST (2006)
A study of the statistics of cosmological black-hole jet sources is applied to EGRET blazar data, and predictions are made for GLAST. Black-hole jet sources are modeled as collimated relativistic...
Time-Dependent Synchrotron and Compton Spectra from Jets of Microquasars (2006)
Gupta, Swati, Boettcher, Markus, Dermer, Charles D.
Jet models for the high-energy emission of Galactic X-ray binary sources have regained significant interest with detailed spectral and timing studies of the X-ray emission from microquasars, the...
Dermer, Charles D., Atoyan, Armen
The accretion of ~ 0.1 -- 1 M_o of material by a neutron star through Roche lobe overflow of its companion or through white-dwarf/neutron-star coalescence in a low mass binary system could be enough...
Gamma Rays from Compton Scattering in the Jets of Microquasars: Application to LS 5039 (2005)
Dermer, Charles D., Boettcher, Markus
Recent HESS observations show that microquasars in high-mass systems are sources of VHE gamma-rays. A leptonic jet model for microquasar gamma-ray emission is developed. Using the head-on...
Gamma Ray Bursts as Possible High Energy Sources (2005)
Gamma-ray bursts are known to be sources of high-energy gamma rays, and are likely to be sources of high-energy cosmic rays and neutrinos. Following a short review of observations of GRBs at...
A Class of Exact Solution to the Blandford-Znajek Process (2005)
Menon, Govind, Dermer, Charles D.
We analyze the constraint equation giving allowed solutions describing fields and currents in a force-free magnetosphere around a rotating black hole. Utilizing the divergence properties of the...
Menon, Govind, Dermer, Charles D.
The Blandford-Znajek constraint equation for a stationary, axisymmetric black-hole force-free magnetosphere is cast in a 3+1 absolute space and time formulation, following Komissarov (2004). We...
Cosmic Rays from Gamma Ray Bursts in the Galaxy (2005)
Dermer, Charles D., Holmes, Jeremy M.
The rate of terrestrial irradiation events by galactic gamma-ray bursts (GRBs) is estimated using recent standard-energy results. We assume that GRBs accelerate high-energy cosmic rays, and present...
The Collapsar and Supranova Models (2004)
This rapporteur review summarizes results presented in Parallel Session GBT2 (Gamma Ray Burst Theory 2) on the Collapsar and Supranova Models held 25 July 2003 at the 10th Marcel Grossmann Meeting on...
Nonthermal Radiation Processes in X-ray Jets (2004)
Dermer, Charles D., Atoyan, Armen
Analytic approximations for synchrotron, synchrotron self-Compton (SSC), and external Compton (EC) processes are used to constrain model parameters for knot and hot-spot emission in extended jets of...
Curvature Effects in Gamma Ray Burst Colliding Shells (2004)
An elementary kinematic model for emission produced by relativistic spherical colliding shells is studied. The case of a uniform blast-wave shell with jet opening angle $\theta_j \gg 1/\Gamma$ is...
Frontiers in Cosmic Rays (2004)
Anchordoqui, Luis A., Dermer, Charles D., Ringwald, Andreas
This rapporteur review covers selected results presented in the Parallel Session HEA2 (High Energy Astrophysics 2) of the 10th Marcel Grossmann Meeting on General Relativity, held in Rio de Janeiro,...
High-Energy Cosmic Rays from Gamma-Ray Bursts (2003)
Wick, Stuart D., Dermer, Charles D., Atoyan, Armen
A model is proposed for the origin of cosmic rays (CRs) from ~10^14 eV to the highest energies, >10^20 eV. Gamma-Ray Bursts (GRBs) are assumed to inject CR protons and ions into the interstellar...
Dermer, Charles D., Mitman, Kurt E.
An external shock model for the prompt gamma-ray luminous phase of gamma-ray bursts (GRBs) is treated both analytically and numerically. A widely cited derivation claiming that an external shock...
High Energy Neutrinos from Gamma Ray Bursts (2003)
Dermer, Charles D., Atoyan, Armen
We treat high-energy neutrino production in GRBs. Detailed calculations of photomeson neutrino production are presented for the collapsar model, where internal nonthermal synchrotron radiation is the...
Nonthermal Particles and Radiation Produced by Cluster Merger Shocks (2002)
Berrington, Robert C., Dermer, Charles D.
We have developed a numerical model for the temporal evolution of particle and photon spectra resulting from nonthermal processes at the shock fronts formed in merging clusters of galaxies. Fermi...
Supranova Model for the Delayed Reddened Optical Excesses Detected in Several GRBs (2002)
Excess reddened optical emission has been measured in the power-law decay afterglow light curves of several GRBs some tens of days after the GRB events. This emission is claimed to be a signature of...
Neutral Beams from Blazar Jets (2002)
Atoyan, Armen M., Dermer, Charles D.
We treat the production of neutrons, photons, and neutrinos through photomeson interactions of relativistic protons with ambient photons in the compact inner jets of blazars. We show that the...
Gamma Ray Bursts and the Collapsar Model: a comment on astro-ph/0203391 and astro-ph/0203467 (2002)
In an essay published in 1997, M. J. Harris pointed out that the development of a theoretical explanation, or "synthesis," of a group of astronomical results can lead to a situation where subsequent...
Dermer, Charles D., Atoyan, Armen M.
Chandra observations of knots and hot spots in spatially resolved X-ray jets of radio galaxies show that the X-ray fluxes often lie above an extrapolation from the radio-to-optical continuum fluxes....
Maximum Particle Energies by Fermi Acceleration and the Origin of Cosmic Rays above the Knee (2000)
We derive the maximum accelerated particle energy from first-order and second-order Fermi acceleration at nonrelativistic and relativistic shocks for explosions taking place in a uniform surrounding...
Adiabatic Losses and Stochastic Particle Acceleration in Gamma-Ray Burst Blast Waves (2000)
Dermer, Charles D., Humi, Mayer
We treat the problem of adiabatic losses and stochastic particle acceleration in gamma-ray burst (GRB) blast waves that decelerate by sweeping up matter from an external medium. The shocked fluid is...
Gamma Ray Bursts, Cosmic Ray Origin, and the Unidentified EGRET Sources (2000)
Statistical arguments show that the volume- and time-averaged kinetic power of GRBs and fireball transients (FTs) into an L* galaxy like the Milky Way is at the level of 10^40 ergs/s. This number,...
Neutrino, Neutron, and Cosmic Ray Production in the External Shock Model of Gamma Ray Bursts (2000)
The hypothesis that ultra-high energy (>~ 10^19 eV) cosmic rays (UHECRs) are accelerated by gamma-ray burst (GRB) blast waves is assumed to be correct. Implications of this assumption are then...
Flash-Heating of Circumstellar Clouds by Gamma Ray Bursts (2000)
Dermer, Charles D., Boettcher, Markus
The blast-wave model for gamma-ray bursts (GRBs) has been called into question by observations of spectra from GRBs that are harder than can be produced through optically thin synchrotron emission....
External Shock Model for Gamma-Ray Bursts during the Prompt Phase (2000)
The hard X-ray and gamma-ray phenomenology of gamma-ray bursts (GRBs) can be explained by an external shock model where a single relativistic blast wave interacts with the surrounding medium. Besides...
High Energy Radiation from Gamma Ray Bursts (1999)
Dermer, Charles D., Chiang, James
Gamma-ray burst (GRB) engines are probed most intimately during the prompt gamma-ray luminous phase when the expanding blast wave is closest to the explosion center. Using GRBs 990123 and 940217 as...
Dermer, Charles D., Chiang, James, Mitman, Kurt E.
We present detailed calculations of nonthermal synchrotron and synchrotron self-Compton (SSC) spectra radiated by blast waves that are energized by interactions with a uniform surrounding medium....
The External Shock Model of Gamma-Ray Bursts: Three Predictions and a Paradox Resolved (1999)
Dermer, Charles D., Boettcher, Markus, Chiang, J.
In the external shock model, gamma-ray burst (GRB) emissions are produced by the energization and deceleration of a thin relativistic blast wave due to its interactions with the circumburst medium...
The kinetic energy of bulk relativistic plasma ejected from the central engine of blazars is converted into nonthermal particle energy in the comoving frame through a process of sweeping up material...
Variability and Unification of Blazars and Gamma Ray Bursts (1998)
Dermer, Charles D., Chiang, James
Most models for blazars and gamma-ray bursts involve relativistic plasma outflows powered by accretion processes onto black holes. The blast wave physics developed for cosmological models of GRBs is...
Short Timescale Variability in the External Shock Model of Gamma Ray Bursts (1998)
Dermer, Charles D., Mitman, Kurt E.
We have developed a computer model to calculate gamma ray burst (GRB) light curves and efficiencies from the interaction of a single, thin blast wave with clouds in the external medium. Large...
On Spectral and Temporal Variability in Blazars and Gamma Ray Bursts (1998)
A simple model for variability in relativistic plasma outflows is studied, in which nonthermal electrons are continuously and uniformly injected in the comoving frame over a time interval dt. The...
Electron Acceleration and Synchrotron Radiation in Decelerating Plasmoids (1997)
Dermer, Charles D., Chiang, James
An equation is derived to calculate the dynamics of relativistic magnetized plasma which decelerates by sweeping up matter from the ISM. Reduction to the non-radiative and radiative regimes is...
Decelerating Plasmoid Model for Gamma-Ray Burst Afterglows (1997)
Chiang, James, Dermer, Charles D.
The flaring and fading radio, optical, and X-ray afterglows from GRB 970508 are modeled by a highly relativistic plasma sphere which decelerates by sweeping up ambient gas. The afterglow emission is...
On the Nature of the Bursting X-Ray Pulsar GRO J1744-28 (1996)
Sturner, Steven J., Dermer, Charles D.
The unusual properties of the bursting X-ray pulsar GRO J1744-28 are explained in terms of a low-mass X-ray binary system consisting of an evolved stellar companion transferring mass through...
Stochastic Particle Acceleration near Accreting Black Holes (1995)
Dermer, Charles D., Miller, James A., Li, Hui
We consider the stochastic acceleration of particles which results from resonant interactions with plasma waves in black hole magnetospheres. We calculate acceleration rates and escape time scales...
Method for Organizing the Multiwavelength Data of Radio-Loud Active Galactic Nuclei (1995)
Schlickeiser, Reinhard, Dermer, Charles D.
The broadband emission observed from radio galaxies, BL Lac objects and quasars is thought to be produced by energetic electrons confined in plasma blobs which are ejected from supermassive black...
Cosmological Models of Gamma-Ray Bursts (1995)
Dermer, Charles D., Weiler, Thomas J.
We review models of cosmological gamma-ray bursts (GRBs). The statistical and $\gamma$-ray transparency issues are summarized. Neutron-star and black-hole merger scenarios are described and estimates...
On the Location of the Acceleration and Emission Sites in Gamma-Ray Blazars (1993)
Dermer, Charles D., Schlickeiser, Reinhard
Compton scattering of external radiation by nonthermal particles in outflowing blazar jets is dominated by accretion-disk photons rather than scattered radiation to distances $\sim 0.01-0.1$ pc from...