Lunes 20 de julio, 13:30 horas Aula del IAR y Canal de YouTube del IAR
Expositora: María Victoria del Valle (IAG – Universidade de São Paulo)
Resumen: In recent years, the role of the winds launched by massive stars in the production of high-energy particles has received significant attention. A very interesting case is that of massive runaway stars that move supersonially through the interstellar medium. In the interaction of the wind with the ambient gas a bow shock nebula is produced. The dust in the nebula is heated by the stellar photons and cools emitting in the infrared, often resulting in an observable extended structure. Many of these nebulae were reported to produce radio emission, and in 3 cases the non-thermal nature of the radiation is confirmed. In this work we analyse the cases of 12 massive runaway stars with confirmed radio observations. We aim to understand the physical conditions that determine the capability of the sources to produce relativistic particles and subsequently the non-thermal emission they produce at radio and gamma-ray energies. We analyse the current and future detectability of these sources at GeVs and TeVs. We conclude that the particles responsible for the synchrotron emission are likely accelerated in the wind shock. While at radio wavelengths the primary challenge is the obstacle is the faint signal resulting from the lack of dense targets for the high-energy particles.