55 research outputs found
Spectral Properties of a Two Component and Two Temperature Advective Flow
Low angular momentum accretion flows very often have centrifugal pressure
supported standing shock waves which can accelerate flow particles. The
accelerated particles in turn emit synchrotron radiation in presence of
magnetic fields. Efficient cooling of the electrons reduces its temperature in
comparison to the protons. In this paper, we assume two temperature flows to
explore this property of shocks and present an example of the emitted radiation
spectrum.Comment: 4 pages, 2 figures To be published in the Proceedings of 10th Marcel
Grossman Meeting, Ed. R. Ruffini et al. (World Scientific: Singapore
Spectral Properties of M87 Using Two-Component Flow
We fit the observational data for M87 using two-component advective disk
model. We show that the flat spectrum from the nucleus of M87 is due to
synchrotron radiation produced by non-thermal electrons in the CENBOL. The
non-thermal distribution is produced due to acceleration of electrons across
the shock in a sub-Keplerian flow.Comment: 4 Pages, 1 Figures, Proceeding of the 2nd Kolkata Conference on
"Observational Evidence for the Black Holes in the Universe", Published in
AIP, 200
Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation IV: Background Simulations using GEANT-4 Toolkit
Hard X-ray detectors in space are prone to background signals due to the
ubiquitous cosmic rays and cosmic diffuse background radiation that
continuously bombards the satellites which carry the detectors. In general, the
background intensity depends on the space environment as well as the material
surrounding the detectors. Understanding the behavior of the background noise
in the detector is very important to extract the precise source information
from the detector data. In this paper, we carry out Monte Carlo simulations
using the GEANT-4 toolkit to estimate the prompt background noise measured with
the detectors of the RT-2 Experiment onboard the CORONAS-PHOTON satellite.Comment: 21 pages, 10 figures, Accepted for publication in Experimental
Astronomy (in press
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