The strange case of SN 2011ja and its host

AbstractSN 2001ja was observed twice in three months using the Chandra X-Ray Observatory. The X-ray flux could be due to interaction with the circumstellar medium, perhaps dominated by the reverse shock heated thermal plasma, or from inverse Compton scattering at the forward shock. In both cases, for a steady wind-like circumstellar density profile, the X-ray flux is expected to fall off as a power law or faster. But the flux from the position of SN 2011ja, increased by a factor of three between these observations. In this presentation, we investigated possible reasons, including contamination from other astrophysical sources such as a X-Ray Binary, within the Chandra's resolution, in the host galaxy using our observations, modelling and pre-explosion Chandra/XMM data.

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

Journal of Synchrotron Radiation ◽

10.1107/s1600577514017500 ◽

2014 ◽

Vol 21 (6) ◽

pp. 1327-1332 ◽

Cited By ~ 2

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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Nested Kirkpatrick–Baez (Montel) optics for hard X-rays

Journal of Applied Crystallography ◽

10.1107/s1600576715003775 ◽

2015 ◽

Vol 48 (2) ◽

pp. 558-564 ◽

Cited By ~ 3

Author(s):

Giacomo Resta ◽

Boris Khaykovich ◽

David Moncton

Keyword(s):

Ray Tracing ◽

Compton Scattering ◽

Analytical Procedure ◽

X Rays ◽

Multilayer Mirrors ◽

Comprehensive Description ◽

X Ray ◽

Inverse Compton Scattering ◽

Inverse Compton ◽

Proper Orientation

A comprehensive description and ray-tracing simulations are presented for symmetric nested Kirkpatrick–Baez (KB) mirrors, commonly used at synchrotrons and in commercial X-ray sources. This paper introduces an analytical procedure for determining the proper orientation between the two surfaces composing the nested KB optics. This procedure has been used to design and simulate collimating optics for a hard-X-ray inverse Compton scattering source. The resulting optical device is composed of two 12 cm-long parabolic surfaces coated with a laterally graded multilayer and is capable of collimating a 12 keV beam with a divergence of 5 mrad (FWHM) by a factor of ∼250. A description of the ray-tracing software that was developed to simulate the graded multilayer mirrors is included.

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