Séminaire Doctoral / Seminar PhD |
| « High-energy astroparticles and transient sources » |
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Claire Guépin |
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In addition to the emergence of time domain astronomy, the advent of multi-messenger astronomy opens up a new window on high-energy sources. The new generation of powerful instruments are reaching sensitivities and temporal resolutions that will allow a multi-messenger detection of transient phenomena. Through the multi-messenger study of such powerful objects -amongst the most energetic in our universe- , two fundamental questions can be addressed: what are the sources of ultra-high energy cosmic rays and the sources of very-high energy neutrinos?
In a first axis, I will discuss the detectability of neutrino flares associated with photon flares, considering a broad range of explosive transients. From this analytical work, we derive a simple estimate of the minimal photon flux necessary for neutrino detection based on two main observables, the bolometric luminosity and the time variability of the emission. It allows to point the most promising sources for transient neutrino emission -and thus for multi-messenger studies. In a second axis, I will focus on one particularly promising source (tidal disruption event, TDE) and describe briefly how we can model and simulate the propagation and interaction of high energy nucleons and nuclei in jetted TDE, in order to evaluate their signatures in cosmic rays and neutrinos. |
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mercredi 14 juin 2017 - 17:00 Salle Entresol Daniel Chalonge, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |