Asian News International 15. January 2020 12:48:37 IST
A research team from the Max Planck Institute for Astronomy has recently gained knowledge about the origin of material in the spiral arms of the Milky Way galaxy. Eventually, new stars form from the spiral arms of the galaxy.
The study was published in "The Astrophysical Journal Letters" (1
The researchers then analyzed the properties of the galactic magnetic field. After the process, the team found that diluted warm ionized medium (WIM) condenses near a spiral arm of the Milky Way. During its cooling phase, it serves as a supply of a colder dust and gas material, which further promotes the formation of a star.
The Milky Way is a disc-shaped sea of stars, in which the youngest and brightest stars gather in the spiral arms. These stars form from the dense interstellar medium (ISM), which consists of dust and gas. It is necessary that such material be constantly flushed into the spiral arms to form new stars and replenish the supply of dust and gas.
After their investigation, the researchers were able to demonstrate that the supply comes from a hotter component of the ISM, which is generally known to surround the Milky Way.
The WIM has an average temperature of 10,000 degrees and high-energy radiation from the hot stars leads to the ionization of hydrogen gas from the WIM.
Research by astronomers suggests that WIM condenses in a narrow area near a spine arm and flows into it when it cools down.
Scientists measured Faraday rotation to discover the dense WIM, which changes the orientation of linearly polarized radio emissions as they travel through the traversed plasma through a magnetic field.
In this study, astronomers were able to detect a strong signal in an inconspicuous area of the galaxy that faces the galactic center and is on the side of the milky way's arm.
The spiral arm stands out in the image data due to the very strong radio emission generated by embedded hot stars and supernova remnants. However, the astronomers found the greatest polarization shift outside of this prominent zone.
The scientists concluded that the increased Faraday rotation is based not on the active part of the spiral arm, but on condensed WIM, which is less obvious part of the spiral arm, as is the magnetic field.
The analysis carried out by scientists is based on the THOR measurement (HI / OH recombination line measurement of the Milky Way), in which a large area of the Milky Way is observed at several radio wavelengths. Polarized radio sources such as distant quasars or neutron stars serve as "probes" for determining the Faraday rotation.
With this, astronomers could not only prove the otherwise difficult to measure magnetic fields in the galaxy, but also examine the structure and properties of the hot gas.
"We were very surprised by the strong signal in a rather quiet area of the Milky Way. These results show that there is still a lot to discover when studying the structure and dynamics of the gas," said the study’s leading astronomer, Henrik Beuther.
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