Multiple Compton scattering by thermal electrons in a spherical inflow - The effects of bulk motion

1988 ◽  
Vol 326 ◽  
pp. 223 ◽  
Author(s):  
Monica Colpi
Keyword(s):  
Compton Scattering ◽  
Multiple Compton Scattering ◽  
Bulk Motion

scholarly journals A Self-consistent Multiple Compton Scattering Model for the X and ɣ-Ray Emission from Active Galactic Nuclei

1981 ◽  
Vol 94 ◽  
pp. 169-170
Author(s):  
L. Maraschi ◽  
R. Roasio ◽  
A. Treves
Keyword(s):  
Active Galactic Nuclei ◽  
Compton Scattering ◽  
Optical Depth ◽  
Galactic Nuclei ◽  
Massive Black Hole ◽  
Turbulent Dissipation ◽  
Heating And Cooling ◽  
Multiple Compton Scattering ◽  
Analytic Estimate ◽  
Cooling Mechanism

We refer to a model of active galactic nuclei where a massive black hole (M≃108M⊙) is accreting spherically (1–3). Turbulent dissipation of the magnetic field produces an efficient heating. For low Thomson optical depth the main cooling mechanism is selfabsorbed cyclo-synchrotron (c-s) radiation from thermal electrons. The energy transfer of the thermal electrons to the c-s photons via Compton scattering (comptonization) becomes increasingly important for increasing optical depth. In ref. 2 the temperature profile of the inflowing gas was calculated balancing the heating and cooling mechanism but neglecting comptonization due to the difficulty of an analytic estimate of this process.

Angular Distribution of Multiple Compton Scattered Gamma Rays in Carbon

2013 ◽  
Vol 770 ◽  
pp. 346-349
Author(s):  
Kittipong Siengsanoh ◽  
Pruittipol Limkitjaroenporn ◽  
Pichet Limsuwan ◽  
Weerapong Chewpraditkul ◽  
Jakrapong Kaewkhao
Keyword(s):  
Angular Distribution ◽  
Compton Scattering ◽  
Gamma Rays ◽  
Single Photon ◽  
Full Energy Peak ◽  
Gamma Energy ◽  
Full Energy ◽  
Multiple Compton Scattering ◽  
Scattered Energy ◽  
Energy Peak

This work studied the angular distribution of multiple Compton scattering of gamma energy 662 keV, obtained from 137Cs source. The gamma rays are incident on carbon scatterer of varying the scattering angles. The phenomenon of multiple Compton scattering has been successfully observed using NaI(Tl) scintillation detector. The energy spectra of the detected photons are observed as a long tail to the single-photon Compton line on the lower side of the full-energy peak in the recorded scattered energy spectrum. The full-energy peak corresponding to singly scattered events is reconstructed analytically and observe that the number of multiply scattered events, having same energy as in the singly scattered distribution.

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