145 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
Modeling of thermal and non-thermal radio emission from HH80-81 jet
Protostellar jets are one of the primary signposts of star formation. A
handful of protostellar objects exhibit radio emission from ionized jets, of
which a few display negative spectral indices, indicating the presence of
synchrotron emission. In this study, we characterize the radio spectra of
HH80-81 jet with the help of a numerical model that we have developed earlier,
which takes into account both thermal free-free and non-thermal synchrotron
emission mechanisms. For modeling the HH80-81 jet, we consider jet emission
towards the central region close to the driving source along with two
Herbig-Haro objects, HH80 and HH81. We have obtained the best-fit parameters
for each of these sources by fitting the model to radio observational data
corresponding to two frequency windows taken across two epochs. Considering an
electron number density in the range cm, we obtained the
thickness of the jet edges and fraction of relativistic electrons that
contribute to non-thermal emission in the range
and , respectively. For the best-fit parameter sets, the
model spectral indices lie in the range of -0.15 to +0.11 within the observed
frequency windows.Comment: 14 pages, 6 figures, Accepted for publication in the Journal of
Astrophysics and Astronom
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