http://polgraw.camk.edu.pl/tags/black-holes/ Black Holes - Tag - Virgo-Polgraw : Grawitational Waves Hugo -- gohugo.ioenThu, 28 May 2026 00:00:00 +0000 http://polgraw.camk.edu.pl/posts/2026-05-28/ Thu, 28 May 2026 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2026-05-28/ The LIGO–Virgo–KAGRA Collaboration published today a new catalog of gravitational wave events. A total of 161 events, detected between April 2024 and the end of January 2025, have been added to the collection, bringing the total number of gravitational wave signals detected to date to 390. Among the most significant findings are: evidence for the existence of second-generation black holes, the most precise sky localization ever achieved for a gravitational wave source, and the first measurement of three vibrational modes of a black hole.]]> http://polgraw.camk.edu.pl/posts/2026-05-26/ Tue, 26 May 2026 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2026-05-26/ The LIGO–Virgo–KAGRA (LVK) detector network has a new trick up its sleeve to improve the instruments’ sensitivity to gravitational waves: it’s called Astrophysical Calibration and it plays a role similar to auto-tune in music production. When a gravitational wave passes through the Earth, the LIGO, Virgo and KAGRA detectors are ready to detect it, but their sensitivity depends on many factors and it is possible that one of them may not be operating at full capacity at that moment.]]> http://polgraw.camk.edu.pl/posts/2025-07-14/ Mon, 14 Jul 2025 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2025-07-14/ The LIGO-Virgo-KAGRA (LVK) Collaboration has announced the detection of the merger of the most massive black holes ever observed with gravitational waves, using the US National Science Foundation funded LIGO Hanford and Livingston Observatories. The merger produced a final black hole more than 225 times the mass of our Sun. The signal, designated GW231123, was observed during the fourth observing run (O4) of the LVK network on November 23, 2023.]]> http://polgraw.camk.edu.pl/posts/2021-06-29/ Tue, 29 Jun 2021 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2021-06-29/ The Virgo, LIGO and KAGRA scientific collaborations today announced the first observation ever of binary systems consisting of a neutron star (NS) and a black hole (BH). This was made possible by the detection, in January 2020, of gravitational signals (nicknamed GW200105 and GW200115 from the dates of their detection) emitted by two systems, in which a black hole and a neutron star, rotating around each other, merged into a single compact object.]]> 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/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/2017-09-27/ 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/2017-06-01/ Thu, 01 Jun 2017 00:00:00 +0000 polgraw http://polgraw.camk.edu.pl/posts/2017-06-01/ The Advanced LIGO detectors registered in the 4th of January 2017 a merger of a black hole binary system of masses approx. 30 and 20 Solar masses and a formation of a remnant black hole of 49 solar masses and spin parameter of about 0.64, at a distance of about 880 Mpc (corresponding to a redshift z = 0.18). It is likely that at least one of the black holes was spinning opposite the direction of the binary orbit.]]>