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<!DOCTYPE html>
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<title>Omar Jamil - XRBs</title>
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<p> X-ray Binaries </p>
<p2> Radio to Infra-red flat spectra observed in X-ray binaries have presented
a long standing conundrum of how the emitting lepton population can be re-accelerated.
This re-acceleration is necessary if adiabatic energy losses
are to be taken into account. In order to investigate this I, alongwith
<a href="http://www.astro.soton.ac.uk/~rpf/" target="blank"> Prof. Rob Fender</a> and Dr. Christian Kaiser,
developed a new simulation
(<a href="http://adsabs.harvard.edu/abs/2010MNRAS.401..394J" target="blank" >iShocks</a>)
where multiple internal shocks are used as a re-acceleration mechanism. We show that, for the first time, it is
possible to reproduce a radio to infra-red flat spectrum with the adiabatic energy losses present.
</p2></br></br>
<p2>
The multiple internal shocks set up also provides a natural set-up to also investigate
the variability from these jets.
We know that optical/infra-red emission from X-ray binary jets varies on short
(sub-second) time-scales. Such variability
in the spectrum in observed when using iShocks. This is demonstrated in
the animated gif below, where as the time increases
can see the spectrum extending to lower frequencies as well as showing rapid
variability. We are currently further
investigating this variability and applying iShocks to reproduce various observations.
</p2>
<figure>
<img src="img/flat14ks.gif" style="vertical-align:middle"/>
<figcaption>Figure: Time dependent spectrum from iShocks demonstrating
the spectrum extending to lower frequencies, plus
rapid variability.</figcaption>
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