http://polgraw.camk.edu.pl/tags/ligo-virgo/ LIGO-Virgo - Tag - Virgo-Polgraw : Grawitational Waves Hugo -- gohugo.ioenWed, 28 Oct 2020 00:00:00 +0000 http://polgraw.camk.edu.pl/posts/2020-10-28/ Wed, 28 Oct 2020 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2020-10-28/ The classification and definitive analysis of the 39 events detected by Virgo and LIGO in the third observation period (which ran from April to October 2019) was published today on the ArXiv online archive. Most of these are black hole mergers, the characteristics of which, however, question some established astrophysical models and open up new scenarios. A likely merger of neutron stars and two probable ‘mixed’ neutron star-black hole systems were also detected in the same period.]]> http://polgraw.camk.edu.pl/posts/2020-09-02/ Wed, 02 Sep 2020 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2020-09-02/ Virgo and LIGO have announced the detection of an extraordinarily massive merging binary system: two black holes of 66 and 85 solar masses, which generated a final black hole of 142 solar masses. The remnant lies in a range of mass that has never before been observed, either via gravitational waves or with electromagnetic observations. The final black hole is the most massive ever detected with gravitational waves. The breaking of the mass record of the Virgo and LIGO observational runs is just one of the many special features that make the detection of this exceptional merger an unprecedented discovery.]]> http://polgraw.camk.edu.pl/posts/2020-03-25/ Wed, 25 Mar 2020 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2020-03-25/ The LIGO Scientific Collaboration and the Virgo Collaboration (the LVC) have agreed to suspend their third observation period, named O3, which has been running since the 1st of April, 2019. The suspension, which will be effective within one week, is motivated by the worldwide COVID-19 pandemic. Public health and worker safety are always the top priority for the LVC. Read more ]]> http://polgraw.camk.edu.pl/posts/2020-01-06/ Mon, 06 Jan 2020 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2020-01-06/ On April the 25th, 2019, the network of gravitational-wave (GW) detectors formed by the European Advanced Virgo, in Italy, and the two Advanced LIGO, in the US, detected a signal, named GW190425. This is the second observation of a gravitational-wave signal consistent with the merger of a binary-neutron-star system after GW170817. GW190425 was detected at 08:18:05 UTC; about 40 minutes later the LIGO Scientific Collaboration and the Virgo Collaboration sent an alert to trigger follow-up telescope observations.]]> http://polgraw.camk.edu.pl/posts/2019-11-04/ Mon, 04 Nov 2019 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2019-11-04/ Advanced Virgo and the two Advanced LIGO detectors resume the taking of science data on the 1st of November, 2019, following a one-month-long stop. This event marks the restart of the third observation period, named O3, which started on the 1st of April, 2019. All three of the interferometers in the global gravitational-wave observatory paused O3 on the 1st October, 2019, in order to work on improvements to enhance the performance of the detectors.]]> http://polgraw.camk.edu.pl/posts/2019-03-04/ Mon, 04 Mar 2019 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2019-03-04/ Today March 4th, 2019 the Advanced LIGO and Advanced Virgo detectors are starting their 14th Engineering Run. ER14 will last at least four weeks: it will be the final test before the start of the 3rd LIGO-Virgo Observation Run (O3). During the first half of the run activities will be scheduled that might still improve the three interferometres in the network. ER14 will allow scientists to perform long-term tests of the detector stability, as well as to check the readiness of the software that analyses data in real time.]]> http://polgraw.camk.edu.pl/posts/2018-12-03/ Mon, 03 Dec 2018 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2018-12-03/ The LIGO and Virgo Collaborations present new results from searches for coalescing cosmic objects. The LIGO and/or Virgo interferometers have now confidently detected gravitational waves from a total of 10 stellar-mass binary black hole mergers and one merger of neutron stars, which are the dense, spherical remains of stellar explosions. Seven of these events had been reported before, while four of the black hole detections are newly announced. From September 12, 2015, to January 19, 2016, during the first LIGO observing run since undergoing upgrades in a program called Advanced LIGO, gravitational waves from three binary black hole mergers were detected.]]> http://polgraw.camk.edu.pl/posts/2017-10-16/ Mon, 16 Oct 2017 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2017-10-16/ Discovery marks first cosmic event observed in both gravitational waves and light. For the first time, scientists have directly detected gravitational waves — ripples in space and time — in addition to light from the spectacular collision of two neutron stars. This marks the first time that a cosmic event has been viewed in both gravitational waves and light. The discovery was made using the U.S.-based Laser Interferometer Gravitational-Wave Observatory (LIGO); the Europe-based Virgo detector; and some 70 ground- and space-based observatories.]]> http://polgraw.camk.edu.pl/posts/2017-09-27/ Wed, 27 Sep 2017 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2017-09-27/ The Virgo collaboration and the LIGO Scientific Collaboration report the three-detector observation of gravitational waves. This result highlights the scientific potential of a global network of gravitational wave detectors, by delivering a better localization of the source and historically first time when the polarizations of gravitational waves have been assessed.The three-detector observation was made on August 14, 2017 at 10:30:43 UTC. The detected gravitational waves were emitted during the final moments of the merger of two black holes with masses about 31 and 25 times the mass of the Sun and located about 1.]]> http://polgraw.camk.edu.pl/posts/2017-08-25/ Fri, 25 Aug 2017 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2017-08-25/ A very exciting LIGO-Virgo Observing run draws to a close on the 25th of August. The Virgo and LIGO Scientific Collaborations have been observing since November 30, 2016 in the second Advanced Detector Observing Run ‘O2’, searching for gravitational-wave signals, first with the two LIGO detectors, then with both LIGO and Virgo instruments operating together since August 1, 2017. Some promising gravitational-wave candidates have been identified in data from both LIGO and Virgo during our preliminary analysis, and we have shared what we currently know with astronomical observing partners.]]>