ABSTRACT A tidal disruption event (TDE), AT2019dsg, was observed to be associated with a PeV neutrino event, IceCube-191001A, lagging the optical outburst by half year. It is known that TDEs may generate ultra fast outflows. If TDE occurs in cloudy environment, outflow-cloud interactions form shock waves which accelerated protons and hence, delayed neutrinos from hadronic clouds. Here, we inves...

We critically assess limits on the maximum energy of protons accelerated within superbubbles around massive stellar clusters, considering a number different scenarios. In particular, we derive under which circumstances acceleration above peta-electronvolt (PeV) energies can be expected. While external forward shock superbubble may account for particles up to 100 TeV, internal primary shocks suc...

We investigate the possibilities to identify the charge of TeV electrons and PeV nuclei using their synchrotron radiation in the earth’s magnetic field. Characteristics of synchrotron radiation photons are evaluated and methods of detection are discussed. To be published in Nucl. Inst. Meth.