19 Aug 2019

Scientists have found the only star that escaped supermassive black hole

Scientists have found the only star that escaped supermassive black hole


Black holes form when a star totally consume its fuel of nuclear fusion and unable to fuse further then the balance between its mass and gravitational force disturbed hence star starts collapsing until it convert into a single point of infinite mass and density.

When black hole totally convert into a single point then that point is termed as point of singularity which posses intimate hence it make a big and deep curve in space time which is deeper than curve made by any other object and that point and curve is simultaneously termed as black hole.

Because of such pit like curve, all the  objects are attracted towards that black hole, a hypothetical region around black hole from where no object can escape is known as event horizon. Once if light entered in event horizon then it also can’t escape from its gravitational pull.

Scientists have discovered a only object in space that managed to escape the gravitational force of a massive black hole. This case is unique and rare because the gravitational pull of the black hole is supposed to be so strong that nothing can escape it, not even light.

Scientists have successfully traced a star named S5-HVS1, which was kicked out of Sagittarius A*, which is a super massive black hole located at the centre of Milkyway galaxy.

The star is moving  from the centre of the galaxy at an astounding speed of around 1700 kilometres per second. This speed indicates that the star got kicked out of the galactic centre about 4.8 million years ago.

Read more:-

•What latest image of black hole tells us?

•What happens if you falls into a Black Hole?

•Black hole can be formed without Stars, resent study suggests!

According to a research paper titled ‘The Great Escape: Discovery of a nearby 1700 km/s star ejected from the Milky Way by Sagittarius A*‘, the star has already spent around 4.8 million years on a lonely journey in the space after it was kicked away from the Sagittarius A* black hole.

“When integrated backwards in time, the orbit of the star points unambiguously to the Galactic Centre, implying that S5-HVS1 was kicked away from Sagittarius A* with a velocity of ∼ 1800 km/s,” the researchers wrote in the paper.

Discovery of star S5-HVS1 was done under the project called the Southern Stellar Stream Spectroscopic Survey under which they were able to find more about composition, temperature, age and velocity of the star.

The scientists said their data proved the runaway star ‘can be unambiguously traced back to the Galactic Centre’. In a previous report, NASA says that the Sagittarius A* black hole is just 26,000 light-years away from Earth, and it is one of the very few black holes in the universe where we can witness the flow of matter nearby.

S5-HVS1 is an A-type star that’s around 2.35 times the mass of the sun and is roughly 29,000 light-years away .

However, S5-HVS1 is the first hyper-velocity star in space that is able to provide constraints surrounding the geometry and kinematics of the Galaxy, including the Solar motion.

The S5-HVS1 ejection velocity being almost twice the velocity of other hyper-velocity stars previously associated with the Galactic Centre, we question whether they have been generated by the same mechanism or whether the ejection velocity distribution has been constant over time.

Also read:-

•Einstein vs Newton on Gravity!

•WARP DRIVE, a technology to travel faster than the light!

What happens if you falls into a Black Hole?

Scientists are currently studying the possibilities that might have led to the star thrown out of the galactic centre.

One such hypothesis is that an intermediate black hole in the galactic centre merged with Sagittarius A* a few million years ago where the dynamical friction at the last stages of its in spiral kicked these stars out.

This can be further investigated by searching for more hypervelocity stars that got ejected at the same time as S5-HVS1.

Further observations of the star will allow us to measure the star's 3D position and velocity with greater accuracy, and hence better model its orbit; this will allow us to precisely pin point the star's origin.


No comments:

Post a Comment