Pulsar Nebula and Supernova 1987A

Relativistic particles emitted by a newly born pulsar in Supernova 1987A may have been still kept in a cavity within an inner ejecta resulted from He-core of the progenitor. The shell surrounding the cavity is accelerated by an energy emitted by the pulsar and finally breaks through the Rayleigh-Tayler instability into filaments such as seen in Crab nebula. Synchrotron radiation confined in the cavity will be observed either when the shell becomes transparent in 5-10 years or when it breaks before that. Magnetic shielding of the high-energy particles from the surrounding ejecta and their composition will be crucial for a flux estimation of the high-energy γ-rays and neutrinos.