Later this month, physicists will resume their hunt for astrophysical monsters without the Virgo detector.
, which set off an explosion called a kilonova that was viewed by myriad telescopes as well. So far, the three detectors have tallied more than 90 mergers of black holes and two of neutron stars.
To spot the minuscule stretching, the arms must be long. LIGO’s extend 4 kilometers and Virgo’s, 3 kilometers. The detectors must also squelch other vibrations to stabilize the length of each arm to 1 femtometer, the width of a proton. So the whole rig resides in a vacuum chamber, and an elaborate suspension system supports each mirror. Virgo’s problems seem to have arisen in the suspension and the mirrors.. In November 2022, a fiber supporting one mirror broke.
The two LIGO detectors are performing well and should be ready for the 24 May restart, says Patrick Brady, an astrophysicist at the University of Wisconsin-Milwaukee and spokesperson for the LIGO collaboration. But the temporary loss of Virgo will limit the science that can be done. Three detectors can pinpoint a source in the sky to within a few dozen square degrees. With two, the localization is far worse.
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