Barbara De Lotto
|Institutional Office Address
DMIF, Room NS2, Phone: +39 0432 558401
|Research Project Title
Study of astrophysical transients with MAGIC experiment
|Research Project Description
My research project will be focused on high energy astrophysics, dealing in particular with data analysis of the MAGIC telescope. The objects of my study will be a kind of very high energy γ-ray sources called Gamma-Ray Bursts (GRBs). I will be analyzing data of GRBs observed by MAGIC. The goals of this project are to investigate the mechanism that lead the very high energy emission of GRBs and to improve the sensitivity of their detections, also working on tools for future observations of these sources with the Cherenkov Telescope Array (CTA) experiment. Part of the project may will also concern with the connection between GRBs and sources of Gravitational Waves (GWs), through the alerts received by the experiment LIGO and, in the near future, by the experiment Virgo. The purpose is to find electromagnetic counterparts of the candidate events of GWs.
GRBs are powerful high-energy transient emission from sources at cosmological distances. They appear randomly on the celestial sphere and their emission is characterized by an initial short phase (~ hundred of seconds) of emission, called prompt emission, in hard-X rays and γ-rays, and a following phase of emission, called afterglow emission, with an emission peak energy shifted to longer wavelenghts ( X-rays, visible and radio) and that lasts from hours to weeks. The most approved scenario that try to explain the emission from GRBs is the internal/external shock scenario. This model predicts the existence of a central engine, a compact object like a black hole, that emits jets of non-thermal radiations. The highly variable gamma-ray emission characteristic of the GRB prompt phase is associated with the dissipation of the jet internal energy in midly relativistic shocks. The afterglow phase is associated with the jet deceleration where an external shock is formed by the interaction of the jet with the circum-burst medium. The progenitors of the central engine are related to the durations of prompt emission and so it is possibile to identify two distinct populations of GRBs:
The gravitational waves detectors such as Virgo or LIGO may help to investigate on the progenitors, especially for short GRBs.