Object LP 40-365, which is a fragment of a supernova event, is currently traveling out of the Milky Way at a speed of 852 kilometers per second. This speed is common in rare animals called hypervelocity stars (HVS).
The speed of HVS even exceeds the escape velocity of the galaxy. In the Milky Way, stars typically have velocities on the order of 100 kilometers per second, whereas HVS has velocities in the range of 1,000 kilometers per second.
Most HVS stars are generally produced near the center of the Milky Way. Here there is a population of extraterrestrial objects than at the edge of the disk. One of the fastest HVS stars in the Milky Way galaxy is the O-class sub-dwarf US 708, which is moving away from the Milky Way at a total speed of about 1,200 kilometers second.
The origins of HVS are believed to be largely from the binary star’s close encounter with the supermassive black hole at the center of the Milky Way. One of the two stars was caught by the black hole’s gravity, while the other escaped into HVS.
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In 2014 a team of astronomers from Vanderbilt University announced in 2014 the discovery of about 20 stars moving at very high speeds. The object is trying to escape from the Milky Way galaxy.
“This hyperfast star is different from what has been found before. The previous stars were big blue stars that came from the center of the galaxy. The stars we found were small, about the size of the Sun, and surprisingly, none of them came from the center of the galaxy,” said Lauren Palladino, lead study from Vanderbilt University.
Paladino said it was strange that the stars did not originate from the center of the galaxy like HVS in general. In fact, usually, the star can be very high speed that glides because of the influence of a giant black hole with a mass of 4 billion times the Sun at the center of the galaxy.
Paladino suspects, the existence of high-speed stars are usually associated with twin stars. If one of the twin stars is pulled by a black hole, the other will be thrown out.
Because it doesn’t come from the center of the galaxy, the origin of this high-speed star is still a mystery.
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“The big question is what makes such a high-speed star? What is working on it now, this still needs further research,” said Palladino.
Editor : Ilham Sudrajat
Writer : Haryo Brono
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