- 3204 - NEUTRON STAR - and Blackhole merger? Two galaxies about 900 million light-years away were merging. Their two blackholes each gobbled up their neutron star companions, triggering gravitational waves that finally hit Earth in January 2020.
--------------------- 3204 - NEUTRON STAR - and Blackhole merger?
- Two galaxies were about 900 million light-years away . These two events were detected just 10 days apart. They are the first-ever detection of a blackhole merging with a neutron star.
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- “Gravitational waves” have allowed us to detect collisions of pairs of blackholes and pairs of neutron stars, but the mixed collision of a blackhole with a neutron star has been the elusive missing piece.
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- Inherent to these models of mergers are their predictions of the rates that blackholes and neutron stars merge amongst themselves. With these detections, we finally have measurements of the merger rates across all three categories of compact binary mergers.
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- The astronomers observed the two new gravitational-wave events on Jan. 5, 2020, and Jan. 15, 2020, during the second half of the LIGO and Virgo detectors third observing run.
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- In June 2020 a blackhole merger with a mystery object, which may be the most massive neutron star known was detected. All three were the result from the merger of a 6-solar mass blackhole with a 1.5-solar mass neutron star, roughly 1 billion light-years from Earth.
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- With observations of the three widely separated detectors on Earth, the direction to the waves' origin can be determined to a part of the sky equivalent to the area covered by 2,900 full moons.
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- Just 10 days earlier, LIGO detected a strong signal. From the gravitational waves, the astronomers inferred that the signal was caused by a 9-solar mass blackhole colliding with a 1.9-solar mass compact object, which they ultimately concluded was a neutron star. This merger happened at a distance of about 900 million light-years from Earth.
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- Because the two events are the first confident observations of gravitational waves from blackholes merging with neutron stars, the researchers now can estimate how often such events happen in the universe, expect roughly one such merger per month happens within a distance of one billion light-years.
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- While it is unclear where these binary systems form, astronomers identified three likely cosmic origins: stellar binary systems, dense stellar environments including young star clusters, and the centers of galaxies.
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- There is still so much we don't know about neutron stars and blackholes. How small or big they can get, how fast they can spin, how they pair off into merger partners. With future gravitational wave data, we will have the statistics to answer these questions, and ultimately learn how the most extreme objects in our universe are made.
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- 3186 - NEUTRON STARS - from magnetars to pulsars? Stars larger than our Sun die with a different fate. They explode as Supernovae and their remnant cores become Pulsars of various types of Neutron Stars. All stars range in mass from 0.2 Solar Mass to 120 Solar Mass. Neutron Stars are in the 8 to 25 Solar Mass Range:
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- 3113 - NEUTRON STARS - We have much more to learn about Neutron Stars. Each property shows itself a little differently depending on our observations and the instruments we use to make the discoveries. It is possible that Neutron Stars become Quark Stars before they become Black Holes. All stars, depending on their size, are destined to evolve into one of these three, :(1) White Dwarf (2) Neutron Star(3) Black Hole. The White Dwarf goes through a giant Red Dwarf stage before it collapses but it is not large enough to go supernova. The Neutron Star and Black Hole both evolve after a giant Supernova explosion.
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- 3084 - NEUTRON STARS - how can they carry charges? Can we have a super-strong magnetic field coming from the inside of a blackhole? We see blackhole magnetic fields, but are they generated inside the event horizon or outside, such as in the accretion disk? And if they do come from the inside, what’s the physics behind that?
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- 2999 - NEUTRON STARS - and magnetars? - Astronomers may have captured the first good look at giant flares from the strongest magnets in the universe. The likely cause of these giant flares that are Starquakes trillions of trillions of times stronger than any earthquakes.
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- 2960 - NEUTRON STARS - to measure expansion of the universe. How fast is the Universe expanding? Ever since the expanding Universe was first discovered nearly 100 years ago, it’s been one of the biggest questions plaguing cosmology. If you can measure how fast the Universe is expanding right now, as well as how the expansion rate is changing over time, you can figure out everything you’d want to know about the Universe as a whole.
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- 2950 - NEUTRON STARS - it dosn’t get any stranger? Astronomy has many, many strange things to try to figure out. Let’s start with “neutron stars“. The crushing gravity, intense magnetic fields, and lightning-fast rotations place “neutron stars” among the most exotic beasts in the universe. Next come the most powerful magnetic fields in the universe wrack the searing surfaces of neutron stars called “magnetars“. These magnetic monsters form one of the most eccentric branches on the neutron star-pulsar family tree.
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- June 30, 2021 NEUTRON STAR - and Blackhole merger? 3204
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