Epic Crash of Neutron Stars Creates 'Hypermassive Magnetar'

Epic Crash of Neutron Stars Creates 'Hypermassive Magnetar' https://www.eresviral.com/wp-content/uploads/2018/11/Epic-Crash-of-Neutron-Stars-Creates-039Hypermassive-Magnetar039

Epic Crash of Neutron Stars Creates 'Hypermassive Magnetar'







		The historic clash of neutron stars that astronomers observed last year did not generate a black hole after all, at least not initially, a new study suggests.

		In October 2017, the researchers announced that they had detected both light and gravity waves, the waves in space-time that Albert Einstein had predicted for the first time a century ago, emanating from the merger of two Superdense star corpses known as neutron stars.

		This epic collision, called GW170817, because it was detected for the first time on August 17, 2017, marked the beginning of the era of "multimensajista astrophysics," the astronomers said. This term refers to the study of a cosmic object or phenomenon using at least two different types of signals.

The[[Neutron-Star Crash: a discovery of gravitational waves in images]

		The data compiled by the project of the Observatory of Gravitational Waves of Laser Interferometer (LIGO) indicated that the object created by the fusion was approximately 2.7 times more massive than the sun. That's right at the edge of the neutron star and black holes, so the identity of the newly formed body was not clear: it was the least massive black hole ever discovered or the most massive neutron star.

		The astronomers initially Inclined towards the interpretation of the black hole., but the recent study defends a neutron star, specifically, a supermagnetic type known as a magnetar. This is because the authors extracted a new signal from the data collected by LIGO and its sister project, Virgo, a 5-second "chirp" descending that began after the initial round of gravitational waves, but before an accompanying burst of high energy gamma rays.

		The study reports that the frequency of this newly discovered chirp was less than 1 kilohertz (kHz). That's consistent with what a magnetar should produce, and it's significantly less than the expected minimum value of a black hole of about 3 solar masses, which should be at least 2 kHz, the study team members said.

		"We are still very much in the pioneering era of gravitational wave astronomy," said lead author Maurice van Putten of Sejong University in South Korea. he said in a statement. "Therefore, it is worth looking at the data in detail, for us this really paid off, and we were able to confirm that two neutron stars merged to form a larger one."





						


A graph showing data points from the LIGO gravitational wave observatory, which represents frequency as a function of time. The screech GW170817 in the gravitational waves produced by the coalescence of two neutron stars is clearly visible as a sequence of points in an upward curve. 

            						    Credit: M.H.P.M. van Putten and M. Della Valle / LIGO 


		The fate of the magnetar, however, is unknown. You can enjoy a long life as a fast-spinning neutron star called a pulsar, or it can collapse to form a black hole, the researchers wrote in the study, which was published online in September in the journal Monthly notices of the Royal Astronomical Society: Letters.



	Mike Wall's book on the search for extraterrestrial life. "Out there"(Grand Central Publishing, 2018, illustrated by Karl Tate) is now available. @michaeldwall. Follow us @Spacedotcom or Facebook. Originally published in Space.com. 

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