Home Health LIGO caught the first gravitational wave of the new season

LIGO caught the first gravitational wave of the new season


In the database of
registration of gravitational waves seemed like a new candidate event under the number S190408an.
This happened less than 10 days after the start of the new observation phase.
work of American antennas LIGO. No electromagnetic flash has been recorded at this time.
radiation from the same direction – this means that the most likely source of a gravitational wave is the fusion of black holes.

A new session of the search for gravitational waves on a few American installations LIGO and the European Virgo antenna began on 1 April. Observatory resumed work after
modernization, which lasted 19 months. The sensitivity of the equipment after it has increased considerably, as well
the volume of the universe in which gravitational telescopes can "hear" the fusion of black holes.
Preliminary optimistic estimates have shown that we can expect a pace
registration at the level of one event per week.

And these estimates were almost confirmed: the new event was
recorded at 18:18:02 GMT (21:18:02 Moscow time) on April 8,
after only 8 days after the start of the new observation period. The signal source was in the constellation Lizard, but the accuracy and amount of gravity
antennas are still not enough to determine the direction with small errors:
the localization area with an accuracy of 90 percent covers an area of ​​387 in the air
square degrees. The distance to the source is 4.7 billion light years with an error of about 1.1 billion light years.

Not at this time
information about the size and mass of black holes, but judging by the fairly large ones
distance and reliable detection, as evidenced by the high signal-to-noise ratio (43),
these were quite massive objects with a mass of about 30 solar energy.

Immediately after receiving the event data, "normal" electromagnetic telescopes and particle detectors began to inspect the area from which the signal came to detect traces of a flash, which could happen if gravitational waves were generated by merging neutron stars. In total, the observations include more than 10 instruments, including X-ray and gamma telescopes, Fermi, Integral, Swift, the IceCube neutrino telescope, the Russian network of MASTER telescopes and many others. However, no electromagnetic signal could be detected.

The head of the MASTER project, Vladimir Lipunov, told N + 1 that his colleagues managed to repair optical transients, but they are unlikely to have anything to do with the gravitational wave.

LIGO antennas allowed for the first time
stories capture gravitational waves, as announced in 2016, and
in 2017 the Nobel Prize in physics was awarded. More information about the registration of gravitational waves can be found in the materials "On the edge of the metric tensor", "Sharpener for a quantum pencil" and "Thinner than a proton".

Timur Keshelava

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