Astronomers from the United States and South Korea have made the first high-resolution resolution of the molecular clouds within a massive star-forming region of the outer Milky Way.
"Charles Kerton, associate professor of physics and astronomy at the Iowa State University. The Milky Way Region is called CTB 102. It's about 14,000 light years from Earth. It's classified as an HII region, charged by hydrogen atoms.
And so, "this region has been very poorly mapped out," Kerton said.
The astronomers describe their Astrophysical Journal . Lead authors are Sung-ju Kang, a staff scientist at the Korean Astronomy and Space Science Institute and a former graduate student at Iowa State University; and Brandon Marshall, a former Iowa State Graduate Student at the University of Nebraska at Kearney. Other co-authors are Kerton and Youngsik Kim, Minho Choi and Miju Kang, of the Korean Astronomy and Space Science Institute.
Kim is also with the Daejeon Observatory in South Korea.
Kerton said the astronomers used in the Taeduk Radio Astronomy Observatory in South Korea. ] "That tells us the mass and structure of the material in the interstellar medium there," Kerton said.
First, the astronomers used radio data to describe the physical structure and characteristics of infrared data
About 100,000 masses of our sun. Next, they used infrared data to determine the stellar content within the clouds.
They report the star formation efficiency of the whole CTB 102 region at about 5% to 10%, similar to other giant molecular clouds within the galaxy. But, they found a subregion of the clouds of 37% to 37%. That's much more than a subregion of its size. They speculate the subregion of the massive cluster of young, developing stars
Why is the star formation in that one subregion? Kerton says that's a question for further study. Maybe, they said, there's something special about the interstellar material in that subregion, which is next to the massive HII region.
"This is the first look at this," Kerton said.
But now they could – with a few pixels.
But now they could – with the help of the new South Korean radio observatory. The study's high-resolution observations, Kerton said, "are also many other potential targets."
Multiwavelength observations of star-forming region uncover dozens of new celestial objects
High-Resolution Observations of the Molecular Clouds Associated with the Huge HII Region CTB 102, arXiv: 1904.00529 [astro-ph.GA] arxiv.org/abs/1904.00529
Astronomers take first, high-resolution look at the huge star-forming region of Milky Way (2019, April 15)
retrieved 15 April 2019
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