scholarly journals Recent developments of inverse Compton scattering model of pulsar radio emission

2000 ◽  
Vol 177 ◽  
pp. 405-408
Author(s):  
G. J. Qiao ◽  
R. X. Xu ◽  
J. F. Liu ◽  
B. Zhang ◽  
J. L. Han
Keyword(s):  
Compton Scattering ◽  
New Classification ◽  
Pulsar Radio ◽  
Inverse Compton Scattering ◽  
The Core ◽  
Conical Emission ◽  
Inverse Compton ◽  
Recent Developments ◽  
Emission Beam ◽  
Pulsar Radio Emission

AbstractMany theoretical efforts were made to understand the core and conal emission identified from observations by Rankin (1983) and Lyne and Manchester (1988). One of them, named as inverse Compton scattering (ICS) model (Qiao & Lin 1998), has been proposed. It is found in the model that: there are central or ‘core’ emission beam, and one or two hollow conical emission beams; the different emission components are emitted at different heights; owing to different radiation components emitted from different height, the observed emission beams can be shifted from each other due to retardation and aberration effects; the sizes of emission components change with frequencies. Recent developments of the model include: simulations of pulse profiles at different frequencies; studying the basic polarization properties of inverse Compton scattering in strong magnetic fields; computing the polarizations and spectrum of core and cones. A new classification system was also proposed. The main results calculated from the model are consistent with the observations.

scholarly journals Pulsar Emission Beams and Profiles in an Inverse-Compton Scattering Model

1992 ◽  
Vol 128 ◽  
pp. 238-241 ◽  
Author(s):  
G. J. Qiao
Keyword(s):  
Compton Scattering ◽  
Hollow Cone ◽  
Polar Cap ◽  
Pulsar Emission ◽  
Scattering Model ◽  
Inverse Compton Scattering ◽  
The Core ◽  
Inverse Compton ◽  
Core Components ◽  
Radio Frequencies

AbstractThe vast majority of pulsar profiles at meter wavelengths are dominated by core components (Rankin 1983, 1990; Lyne and Manchester 1988), but in the usual polar cap models of pulsar emission, it is difficult to get central beam or “core” radiation. In this paper, we present a calculation for both the “core” and hollow “cone” emission beams, as well as model pulse profiles in an inverse-Compton scattering (ICS) model. Both “core” and hollow “cone” emission beams axe obtained naturally in the calculations. Examples of pulse profiles of pulsars at different radio frequencies are presented.The theoretical shapes of the pulse profiles agree very satisfactorily with actual observations, which means that the mechanism suggested here may be the actual one.

scholarly journals The Locations of the Core and Conal Emission Regions in an Inverse-Compton Scattering Model

1992 ◽  
Vol 128 ◽  
pp. 242-244
Author(s):  
G. J. Qiao ◽  
C. G. Li ◽  
M. Li
Keyword(s):  
Compton Scattering ◽  
Radio Pulsars ◽  
Hollow Cone ◽  
Scattering Model ◽  
Inverse Compton Scattering ◽  
Physical Conditions ◽  
The Core ◽  
Inverse Compton

AbstractThe physical conditions and locations of the emission regions for core and hollow cone emissions are very important in understanding the mechanism of radio pulsars. We present two related methods in an Inverse-Compton Scattering (ICS) model in this paper, which give a clear scenario for determining the location of the emission regions and are consistent with the results given by Cordes et al. (1984) and Rankin (1990).

scholarly journals Hollow Core?

2000 ◽  
Vol 177 ◽  
pp. 197-198
Author(s):  
G.J. Qiao ◽  
J.F. Liu ◽  
Yang Wang ◽  
X.J. Wu ◽  
J.L. Han
Keyword(s):  
Compton Scattering ◽  
Impact Angle ◽  
Pencil Beam ◽  
Hollow Core ◽  
Radio Pulsars ◽  
Hollow Cone ◽  
Inverse Compton Scattering ◽  
The Core ◽  
Inverse Compton ◽  
The Impact

AbstractWe carried out the Gaussian fitting to the profile of PSR B1237+25 and found that six components rather than five are necessary to make a good fit. In the central part, we found that the core emission is not filled pencil beam but is a small hollow cone. This implies that the impact angle could beβ< 0.5°. The “hollow core” is in agreement with Inverse Compton Scattering model of radio pulsars.

Visualization of microvessels by angiography using inverse-Compton scattering X-rays in animal models

2014 ◽  
Vol 21 (6) ◽  
pp. 1327-1332 ◽  
Author(s):  
Toshiharu Fujii ◽  
Naoto Fukuyama ◽  
Chiharu Tanaka ◽  
Yoshimori Ikeya ◽  
Yoshiro Shinozaki ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Photon Number ◽  
High Gain ◽  
Image Sensor ◽  
Clinical Settings ◽  
X Rays ◽  
X Ray ◽  
Inverse Compton Scattering ◽  
Small Vessels ◽  
Inverse Compton

The fundamental performance of microangiography has been evaluated using the S-band linac-based inverse-Compton scattering X-ray (iCSX) method to determine how many photons would be required to apply iCSX to human microangiography. ICSX is characterized by its quasi-monochromatic nature and small focus size which are fundamental requirements for microangiography. However, the current iCSX source does not have sufficient flux for microangiography in clinical settings. It was determined whether S-band compact linac-based iCSX can visualize small vessels of excised animal organs, and the amount of X-ray photons required for real time microangiography in clinical settings was estimated. The iCSX coupled with a high-gain avalanche rushing amorphous photoconductor camera could visualize a resolution chart with only a single iCSX pulse of ∼3 ps duration; the resolution was estimated to be ∼500 µm. The iCSX coupled with an X-ray cooled charge-coupled device image sensor camera visualized seventh-order vascular branches (80 µm in diameter) of a rabbit ear by accumulating the images for 5 and 30 min, corresponding to irradiation of 3000 and 18000 iCSX pulses, respectively. The S-band linac-based iCSX visualized microvessels by accumulating the images. An iCSX source with a photon number of 3.6 × 103–5.4 × 104times greater than that used in this study may enable visualizing microvessels of human fingertips even in clinical settings.

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