The influence of dust on the inverse Compton emission   from jets in Active Galactic Nuclei

Arbeiter, C.; Pohl, M.; Schlickeiser, R.

doi:10.1051/0004-6361:20020221

Cited by 47 publications

(45 citation statements)

References 23 publications

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“…Possible target photon fields are the synchrotron photons produced within the jet (the SSC process: [52,50,8]) or external photons (the EC process). Possible sources of external seed photons are accretiondisk photons entering the jet directly [22] or after being reprocessed in the circumnuclear material (e.g., the broad line regions of quasars) [77,23], jet synchrotron emission reflected off clouds in the circumnuclear material [31], infrared emission from a dust torus around the central engine [6,3]. In addition, γγ absorption, pair production, and synchrotron self absorption must be taken into account in a self-consistent leptonic blazar model.…”

Section: Leptonic Blazar Modelsmentioning

confidence: 99%

Modeling the emission processes in blazars

Böttcher

2007

Astrophys Space Sci

330

267

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Blazars are the most violent steady/recurrent sources of high-energy gamma-ray emission in the known Universe. They are prominent emitters of electromagnetic radiation throughout the entire electromagnetic spectrum. The observable radiation most likely originates in a relativistic jet oriented at a small angle with respect to the line of sight. This review starts out with a general overview of the phenomenology of blazars, including results from a recent multiwavelength observing campaign on 3C279. Subsequently, issues of modeling broadband spectra will be discussed. Spectral information alone is not sufficient to distinguish between competing models and to constrain essential parameters, in particular related to the primary particle acceleration and radiation mechanisms in the jet. Short-term spectral variability information may help to break such model degeneracies, which will require snap-shot spectral information on intraday time scales, which may soon be achievable for many blazars even in the gamma-ray regime with the upcoming GLAST mission and current advances in Atmospheric Cherenkov Telescope technology. In addition to pure leptonic and hadronic models of gamma-ray emission from blazars, leptonic/hadronic hybrid models are reviewed, and the recently developed hadronic synchrotron mirror model for TeV γ-ray flares which are not accompanied by simultaneous X-ray flares ("orphan TeV flares") is revisited.

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Section: Leptonic Blazar Modelsmentioning

confidence: 99%

Modeling the emission processes in blazars

Böttcher

2007

Astrophys Space Sci

330

267

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“…Gamma radiation in leptonic models of broadband blazar emission is attributed to synchrotron self-Compton (Maraschi et al 1992;Bloom & Marscher 1996;Tavecchio et al 1998) or external Compton (Dermer & Schlickeiser 1993;Sikora et al 1994;Böttcher et al 1997;Dermer et al 1997;Arbeiter et al 2002) processes (see Böttcher 2002 andMadejski 2001 for recent reviews). In hadronic models, secondary photopairs and photomesons and secondary mesons are produced when energetic protons and ions interact either with ambient synchrotron photons (Mannheim & Biermann 1992;Mannheim 1993), photons of the external field (Bednarek & Protheroe 1999;Atoyan & Dermer 2000) and/or ambient matter fields .…”

Section: Introductionmentioning

confidence: 99%

Conversion of relativistic pair energy into radiation in the jets of active galactic nuclei

Schlickeiser

Vainio

Böttcher

et al. 2002

A&A

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Abstract. It is generally accepted that relativistic jet outflows power the nonthermal emission from active galactic nuclei (AGN). The composition of these jets -leptonic versus hadronic -is still under debate. We investigate the microphysical details of the conversion process of the kinetic energy in collimated relativistic pair outflows into radiation through interactions with the ambient interstellar medium. Viewed from the coordinate system comoving with the pair outflow, the interstellar protons and electrons represent a proton-electron beam propagating with relativistic speed in the pair plasma. We demonstrate that the beam excites both electrostatic and low-frequency magnetohydrodynamic Alfven-type waves via a two-stream instability in the pair background plasma, and we calculate the time evolution of the distribution functions of the beam particles and the generated plasma wave turbulence power spectra. For standard AGN jet outflow and environment parameters we show that the initial beam distributions of interstellar protons and electrons quickly relax to plateau-distributions in parallel momentum, transferring thereby one-half of the initial energy density of the beam particles to electric field fluctuations of the generated electrostatic turbulence. On considerably longer time scales, the plateaued interstellar electrons and protons will isotropise by their self-generated transverse turbulence and thus be picked-up in the outflow pair plasma. These longer time scales are also characteristic for the development of transverse hydromagnetic turbulence from the plateaued electrons and protons. This hydromagnetic turbulence upstream and downstream is crucial for diffusive shock acceleration to operate at external or internal shocks associated with pair outflows.

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“…Poutanen 2011). The second possible region for the γ-ray production is beyond the BLR (e.g., Błażejowski et al 2000;Arbeiter et al 2002;Sokolov & Marscher 2005;Yan et al 2012;Meyer et al 2015). Some multi-wavelength observations for the giant flares suggested that both the sub-millimeter and γ-rays are produced 10-20 pc from the BH (e.g., Larionov et al 2008;Sikora et al 2008), where it was assumed that γ-ray and radio emission is triggered by shocks propagating along a relativistic jet.…”

Section: Introductionmentioning

confidence: 99%

Constraints on the Location of γ-Ray Sample of Blazars with Radio Core-shift Measurements

Yan

et al. 2018

ApJ

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We model simultaneous or quasi-simultaneous multi-band spectral energy distributions (SEDs) for a sample of 25 blazars that have radio core-shift measurements, where a one-zone leptonic model and Markov chain Monte Carlo technique are adopted. In the SED fitting for 23 low-synchrotron-peaked (LSP) blazars, the seed photons from the broad-line (BLR) and molecular torus are considered respectively in the external Compton process. We find that the SED fitting with the seed photons from the torus are better than those utilizing BLR photons, which suggest that the γ-ray emitting region may be located outside the BLR. Assuming the magnetic field strength in the γ-ray emitting region as constrained from the SED fitting follows the magnetic field distribution as derived from the radio core-shift measurements (i.e.,1 , where R is the distance from the central engine and B 1 pc is the magnetic field strength at 1 pc), we further calculate the location of the γ-ray emitting region, g R , for these blazars. We find that~ǵ  R R R 2 10 10 4 S B L R (R S is the Schwarzschild radius and R BLR is the BLR size), where R BLR is estimated from the broad-line luminosities using the empirical correlations obtained using the reverberation mapping methods.

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The influence of dust on the inverse Compton emission from jets in Active Galactic Nuclei

Cited by 47 publications

References 23 publications

Modeling the emission processes in blazars

Modeling the emission processes in blazars

Conversion of relativistic pair energy into radiation in the jets of active galactic nuclei

Constraints on the Location of γ-Ray Sample of Blazars with Radio Core-shift Measurements

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