Wednesday , December 8 2021

Research: The observatories are also releasing their first catalog & # 39; & # 39 events; gravity waves –



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On Saturday, 1 & # 39; December, scientists attending Gravitational Physics Wave and Astronomy Workshop in & # 39; College Park, Maryland, presented new results from the National Science Foundation LIGO (Laser interferometer Gravitational Wave Observatory) and the detector to search koalizzar of & # 39; cosmic objects, such pairs & # 39; black holes and pairs & # 39; neutron stars. The collaborations & # 39; LIGO and Virgo are now caught with & # 39; & # 39 waves of trust; a total of gravity & # 39; 10 mergers & # 39; sound track & # 39; stellar track and merger & # 39; Neutron stars, which are spherical remains & # 39; stellar explosions. Six of events & # 39; & # 39 combination; black hole have been reported previously, while four & # 39; been announced again.

From 12 & # 39; September, 2015, to 19 & # 39; In January 2016, during the first run of & # 39; LIGO observation since been updates in a program called Advanced LIGO, gravitational waves from three tracks found associations & # 39; black hole. Second run & # 39; observation, which lasted from 30 & # 39; November 2016 to 25 & # 39; August 2017, produced merger & # 39; of binary stars and seven neutrons & # 39; & # 39 additional mergers; black track rails, including four & # 39; new gravitational wave events being reported now. The new events are known as GW170729, GW170809, GW170818, GW170823 and, b & # 39; reference to the dates found.

All events are included in & # 39; re catalog, also released Saturday, b & # 39; some events to break records. For example, the new event GW170729, found in the second run & # 39; observation 29 & # 39; In July 2017, is the source of the waves of the most massive and distant ever observed gravity. F & # 39; this koalesċenza, happened roughly 5 billion years ago, equal power & # 39; nearly five solar masses has been converted into & # 39; gravitational radiation.

GW170814 was the first binary combination & # 39; black hole measured from the network & # 39; three detector, and allowed for the first polarization tests of gravity waves (similar to light polarization).

The event GW170817, discovered three days after GW170814, represented the first time that the gravitational waves have been observed from the combination of & # 39; of binary neutron star system. In addition, this collision was observed in & # 39; gravitational waves and in the light, and marked an exciting new chapter in the multi-messenger astronomy, where cosmic objects are observed simultaneously in & # 39; various forms of & # 39; radiation .

One of the new events, GW170818, which was discovered by a global network formed by the LIGO and Virgo observers, was identified by & # 39; very accurate way into heaven. The position of the track black holes, located 2.5 billion light years from Earth, was identified in the air with an accuracy of & # 39; 39 square degrees. This makes it the best source & # 39; next wave of gravity located behind the merger & # 39; the star of GW170817 neutrons.

Albert Lazzarini, Deputy Director of the LIGO Laboratory & # 39; Caltech, says "The release of & # 39; four & # 39; additional tracks mergers & # 39; black hole inform us more about the nature of the population a & # 39; these binary systems in the universe and increase the event rate for these types of & # 39; events. "

"F & # 39; one year, LIGO and Virgo work together to dramatically advanced patterns & # 39; gravity waves, and the rate of & # 39; discovery suggests that the most spectacular discoveries yet to come," says Denise Caldwell, Director of the Division of Physics & # 39; NSF. "The LIGO achievements of NSF and its international partners are a source of & # 39; pride for the agency, and we expect greater progress because of the sensitivity of & # 39; LIGO become better and better in the year comes. "

"The run & # 39; next observation, starting in spring 2019, should lead to many more waves candidates of gravity, and the science community can & # 39; conduct will grow accordingly ", says David shoemakers, spokesperson for the LIGO Scientific Collaboration and scientist & # 39; senior research at the MIT KAVLI Institute for astrophysics and Space research. "It's a very exciting time".

"It is gratifying to see the new capabilities made available by adding a & # 39; Advanced Virgo to the global network," says Jo van den Brand of Nikhef (the Dutch National Institute for Subatomika Physics) and VU University Amsterdam is the spokesperson for the Virgo Collaboration. "The accuracy of our most improved pointing will allow astronomers to find another cosmic messengers derived from sources of gravity waves." The improved capacity & # 39; an indication of the LIGO-Virgo network is possible by exploiting the time & # 39; delay of sites and patterns called & # 39; antenna & # 39; the interferometers.

"The new catalog is another proof of the exemplary international collaboration of gravity waves community and lead to runs and the following promotions" adds Director of EGO Stavros Katsanevas.

The scientific papers describing these new findings, being published early on the arXiv repository of electronic preprint, presenting detailed information in the form of & # 39; catalog of detecting gravitational waves and events two races candidate & # 39; observing and describing the characteristics of the population & # 39; black hole to join. B & # 39; in particular, we find that almost all black holes formed by the stars are lighter than 45 times the mass of the sun. Thanks & # 39; & # 39 processing; more advanced and better data calibration instruments, the accuracy of astrophysical parameters previously announced events increased by & # 39; considerably.

Laura Cadonati, Deputy Spokesperson for the LIGO Scientific Collaboration, says "These new discoveries were only possible through the unemployed safe and coordinated the detector commissioners in all three observatories, and scientists around the world responsible for data quality and cleansing, to bury signals, and estimate the parameters for each candidate – a scientific specialty that requires immense expertise and experience. "

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