Analysis of effect of temperature and γ-ray radiation on the AlGaInP Quantum Well (QW) structure based laser at 665 nm emission wavelength has been carried out. I-V and P-I characteristics were measured. From these, we determine series resistance (Rs), threshold Current (Ith), Optical output power (Pout) and differential efficiency (ηd). I-V curves vary over temperature and radiation. Ith incre...

Our knowledge of the high-energy universe will change dramatically over the next several years as new astronomical detectors of high-energy radiation reach their design sensitivities. Besides Swift and HESS, which are already making important discoveries, these include the ground-based imaging air-Cherenkov telescopes VERITAS and MAGIC, the γ-ray space telescopes GLAST and AGILE, and the partic...

An e atmosphere is inevitably created around a black hole accretion disc whose spectrum extends to MeV energies. Pairs created in γ − γ collisions outside the disc are blown away by soft radiation (which dominates the bolometric luminosity of the disc) and form a semi-relativistic outflow. We simulate numerically the conversion of the MeV radiation into a vertical e outflow above a disc-like so...

Recent High Energy Stereoscopic System (HESS) observations show that microquasars in high-mass systems are sources of very high energy γ-rays. A leptonic jet model for microquasar γ-ray emission is developed. Using the head-on approximation for the Compton cross section and taking into account angular effects from the star’s orbital motion, we derive expressions to calculate the spectrum of γ r...