- The first detection of gravitational waves produced by colliding neutron stars by LIGO and Virgo and the starting gun of the multi-messenger...
- Speaker: Luciano Nicastro e Eliana Palazzi
Affiliato: INAF Bologna
Martedì 07 Novembre 2017, alle ore 15.00 - Aula Seminari
The first detection of gravitational waves produced by colliding neutron stars by LIGO and Virgo and the starting gun of the multi-messenger astronomy era
In September 2015, the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) detected, for the first time, gravitational waves (GWs) from the merging of two black holes (BHs) of stellar origin, at an approximate distance of 1.4 billion light years. In August 2017, the same international collaboration, which now could use data from the Virgo interferometer in Cascina (near Pisa), detected the GW signal originating from the merging of two neutron stars. The two bodies are less massive and closer than previous LIGO/Virgo discoveries. Moreover, in this last case, the very exceptional result was that scientists were able to subsequently identify the electromagnetic emission (using both space and ground-based telescopes) of the transient event, which obviously was not possible with BH mergers. We will give an overview of the global effort that led to the discovery of the source, named GW170817, and its scientific implications which marked the beginning of the era of multi-messenger astronomy.