20 de outubro de 2020 , por
Explosive neutron star collision is still emitting X-rays, puzzling astronomers When two neutron stars smashed into each other , about 130 million light-years from Earth, the universe lit up.
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“It may be that our models are somehow incomplete and do not fully capture the complexity of these extreme phenomena, or we may be seeing something else," Troja said. Astronomers will turn their telescopes to GW170817 in December, presenting another opportunity to unravel the mystery in the merger.
We have never seen such a thing before, it only exists in our theories and models. According to our understanding of neutron stars, it should have faded away by now.
Here's an overview of our use of cookies, similar technologies and The X-ray afterglow is still visible three years after the detection of GW170817. Connect with friends faster than ever with the new Facebook app. One remarkable feature of the merger was its kilonova, which immediately followed an initial gamma-ray burst.
“The X-rays persist for much longer, and we do not understand why,” Eleonora Troja, an associate research scientist at the University of Maryland in the US, who helped detect GW170817, told The Register. He was abducted in Syria on Aug. 14, 2012 while documenting the intensity of a then-young civil war. After a thousand days of observations, the continuing X-ray radiation from two neutron stars smashing into one another has left astronomers puzzled. “This third possibility is intriguing, because it will place an important constraint on the poorly known equation of state of nuclear matter,” added Bing Zhang, a co-author of the paper and an astrophysics professor at the Uni of Maryland. For the most part, the models lined up with what was detected with GW170817. An exciting possibility is that the remains of the merger represent an X-ray-emitting neutron star -- though much more analysis is required to determine where the signal is coming from. They allow us to count visits and traffic sources so that we can measure and improve the performance of our sites. The X-rays are incredibly energetic and bright: Troja said the emissions are 100 billion times brighter than those from the Sun, judging from the latest readings. Indeed, a paper, of which Troja is lead author, was published in the Monthly Notices of the Royal Astronomical Society on Monday, and suggests the neutron star collision created another neutron star that’s been emitting x-rays for all these years. Why are these X-rays still visible? About nine days after the collision, NASA's Chandra observatory picked up an X-ray signal. "If this jet was launched by our Sun, it would be way further than Pluto, making its way through the Oort cloud.
That's a puzzle the researchers are trying to solve. It may be there's an additional component of the neutron star mergers models have not previously accounted for. Entdecken Sie, warum sich immer mehr Unternehmen für eine Evergreen™-Alternative anstelle der Aktualisierung eines herkömmlichen Storage entscheiden.
That was the case with GW170817.
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“We think that the jet has traveled for over 10,000 billion kilometres, that is larger than the size of our Solar System,” she told us. Light from this kilonova faded about three weeks after GW170817 was observed, as expected.
“In the same way we see the remnants of supernova explosions, like the Crab Nebula or the Jellyfish nebula, we may discover the remnant of a kilonova explosion. If people say no to these cookies, we do not know how many people have visited and we cannot monitor performance.
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Curiously, though, X-rays were picked up nine days after the merger's gravitational wave was detected, and they continue to linger well past what’s typically considered normal.
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The collision, code-named GW170817, was picked up by our planet's LIGO and Virgo gravitational wave detectors in mid-2017. The triad of observatories were able to triangulate the position of the merger moments after it happened, allowing researchers to turn their telescopes to space and get a good look at the event. Neutron stars are the corpses of stars more massive than our sun. We measure how many people read us, two neutron stars smashed into each other, across different wavelengths of the electromagnetic spectrum, in the journal Monthly Notices of the Royal Astronomical Society, These telescopes work with your phone to show exactly what's in the sky. Georgia is seeing record turnout for early voting ahead of Election Day 2020, but the state has had trouble with long lines and excessive wait times that disproportionately affect communities of color.
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When two neutron stars smashed into each other, about 130 million light-years from Earth, the universe lit up.
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But in a new study, published Monday in the journal Monthly Notices of the Royal Astronomical Society, researchers have studied the neutron-star-on-neutron-star impact, designated GW170817, and discovered that 1,000 days later, the X-ray signal was still detectable.
Today is the 36th birthday of missing American journalist Austin Tice. "We really don't know what to expect from this point forward, because all our models were predicting no X-rays," said Eleonora Troja, an astrophysicist at NASA's Goddard Space Flight Center and lead author on the study, in a press release. First, there came a burst of highly energetic gamma rays, followed by bursts of light and UV, radio and infrared signals. Neutron stars are the dense remnants of stars left over from an explosive supernova. You can also change your choices at any time, by hitting the If you're cool with that, hit “Accept all Cookies”. These cookies are used to make advertising messages more relevant to you.
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