Thursday , February 25 2021

The world's first precision galaxy map is complete … Heavy star, galaxy Secret evolution



The part of our galaxy that was inaugurated by NASA on January 10, 2012. This is a mosaic of fragments of images captured by NASA WISE (Wide Area Infrared Radiation Surveyor). The Cassiopeia and Kepesus constellations can also be observed. [EPA=연합뉴스]

There are funny legends in the northern sky. More than 30 degrees north latitude is a five-dimensional constellation story floating throughout the year, & # 39; Kepesus & # 39;.

Kepesus is the king of ancient Ethiopia (Aethiopia) in Greek mythology. I have been through a lot of difficulties because of my pride Cassiopeia. Cassiopeia, whose daughter bragged about her daughter, said, "The beauty of my daughter Andromeda is better than the number 50 daughters of water," and the anger of the sea god Poseidon was bought. When Poseidon sent a monster to drive Ethiopia to the point of extermination, Kepesus had to sacrifice his daughter. Fortunately, Andromeda, which is almost a monster food, saved Medusa and was saved by the hero Perseus and became his wife.

NASA's Bubble Nebula, the 26th anniversary of the birth of the Hubble Space Telescope, this Nebula is in the Cassiopeia constellation, 8000 light years from Earth, and a huge cloud of gas and dust illuminated by starlight in the nebula. [사진 미항공우주국(NASA)]

But Poseidon's anger did not stop here, and finally Cassiopeia hung upside down to become a constellation and continued to circle around the North Pole. Even today, in the northern sky, Cassiopeia, her husband Kepesus, daughter of Andromeda, son-in-law of Perseus, and whale monster shine together as constellations.

Hang heavenly Kepesus … & # 39; heavy star & # 39; could be the secret of galaxy evolution

But it's not just a legend that saves the place. Korean Astronomy and the Space Science Institute (KAIST) announced on March 13 that it had just discovered the birthplace of a hidden star formation in the Kepesu region as a multi-purpose infrared imaging system (MIRIS) developed in 2013. That was the first observation that 66 young stars (stars) under 10 million years, which correspond to the young age of the universe, live in the Keepeus region.

Graph of supernova explosions provided by the European Southern Observatory in 2014. The Massive Star, whose mass is more than 15 times the sun, has a relatively large impact throughout the galaxy due to supernova explosions. For this reason, it can be a clue to study the process of galaxy evolution. [사진 유럽남방천문대]

Finding a place where stars are born is a mystery in itself, but what does it mean by science? "This discovery helps explain the process of galaxy evolution," explained Kim Il-jung, senior researcher at the Astronomy Group of Astronomy Astronomy Observatory. Especially, the stars we find are meaningful because they are 'Big Stars', which are very large, more than 15 times the mass of the sun.

The stars of weight are born and die by that mass and have a large impact on the galaxy as a whole. The most representative is a supernova explosion. Heavy stars decorate the end with energy that will be released by the sun for 10 billion years at a time. That's a supernova. The essence of a star contract and being a very small neutron star or black hole. Heavy stars return oxygen, silicon and iron to the universe they have accumulated throughout their lives in this process. Kim Il-jung, a researcher, said, "Heavy stars have a big influence on the galaxy itself through this process, so observing these stars is a good clue to see how our galaxy has changed chemically and morphologically."

Our eyes are from the sky 600 km above the earth … Mapping the precision of the world's first galaxy

The Korean Astronomy and Space Science Institute (MIRIS) developed the first MIRIS (Multi-purpose Infrared Ray Observation System) telescope in Korea in 2013. It is said that it is advantageous to observe a universe of low orbits around 600 km above the ground and to observe more range broader than the Hubble telescope. [사진 한국천문연구원]

The MIRIS Telescope, launched in November, Science and Satellite Technology No. 3, plays a big role in revealing the secret of Kepesus. The terrestrial telescope Isaac Newton, who had observed galaxies on the ground, had looked into an invisible area. Using this technique, he managed to produce the right galaxy map using & # 39; Paschen Alpha & # 39 ;, the world's first hydrogen spectrum emitted by stars, from observing heavy stars in Kepesus.

The Galaxy Precision Map uses Paschen Alpha, the first of its kind in the world, to be completed by Korean researchers. The box in the upper right corner shows the kefeus area and the red light indicates that the strength of the alpha is released. [사진 한국천문연구원]

Dr. Jung Woong-seop, who participated in the study, said, "The Newton Telescope has used H-alpha, which is a relatively short wavelength between the hydrogen spectrum, to be observed. However, because of" interstellar extinction "where the wavelength is absorbed or spread by various substances in outer space. There are limits, "he explained. However, MIRIS is able to obtain more precise images by observing the wavelength & # 39; Paschen Alpha & # 39; which is longer in space than on the ground. Younger stars form in large, dense clouds called ion ionospheric zones & # 39 ;, which use the hydrogen spectrum from this observation.

MIRIS is known to be able to observe the entire galaxy because it can observe a wider area of ​​NASA's Hubble Space Telescope that observes the universe at the same height. The researchers plan to find more ionizing hydrogen regions in the future, extending throughout the same region. Meanwhile, the results of the study were published in the Astrophysical Journal Supplement Series, the international authority on astronomy.

Huh Jung Won reporter [email protected]


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