# name
Physical properties of the gamma-ray binary LS 5039

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: Josep Maria Paredes Poy

# metadata.dc.description.abstract[].value
We studied the LS 5039 gamma-ray binary in the 0.15-15 GHz range with both simultaneous and non-simultaneous data. From the non-simultaneous data we computed an average spectrum and found that it is best explained by Razin eﬀect with p = 2.16±0.04 and νR = 0.42±0.02 GHz. We obtained two simultaneous spectra for 19 July 2013 and 21 July 2013. The ﬁrst one was explained by SSA with p = 1.86 ± 0.01 while the second was explained by Razin eﬀect with p = 2.28 ± 0.05 and νR = 0.44 ± 0.04 GHz. Therefore, we conclude that the Razin eﬀect can vary to the point of vanishing completely. This, along with further variations in the spectral index, suggests the source experiences changes in either the synchrotron injection, electron density or magnetic ﬁeld in the timescale of days and also timescales within the orbital period (3.906 d). Furthermore, the presence of the Razin eﬀect supports a non-accreting pulsar scenario over a microquasar scenario. Finally, we suggest where further research should be directed towards

# metadata.dc.title[].value
Physical properties of the gamma-ray binary LS 5039