PHY seminar
Hyung Mok Lee(5eoul Nati。nal University)
The gravitational waves were detected directlq for the first time on September lQ at 18:51 (Korean Standard-Time) twin LIGO detectors located at Livingston, Louisiana and Hanford, Washington near simultaneous!. This signal was initial! noticed b니
the detection software within 3 minutes of the arrival, but final
confirmation was made onl after’ !long and careful investigation of
the noise characteristics, shape of the signal and possible influence
of the environment. We finallq concluded that the detected waves
were produced during the last fraction of second of the inspiral and merger of a binar니 S니stem composed of two black holes of about 39 and 26 solar mass each, located at about 1.3 billion light 니ears . During this process, huge amount of energ corresponding to approximatel three times of solar mass in the form of gravitational waves has been radiated awaq, leaving a single black hole of about 62 solar mass behind. In this talk, I will briefl describe the nature of
gravitational waves, the principle of the LIGO detectors and their‘
sensitivities, and how actual detection was made. Then I will close m니 talk b니 commenting on the prospect of the gravitational wave astronom니 brought this detection.