spread across the night skymilky way galaxyHis appearance became weaker and defeated than ever before. A research team at the International Center for Radio Astronomy Research (ICRAR) has created the largest-scale low-frequency observational image of the galaxy’s surface in history.completedof. By capturing galaxies in the low frequency band of 72 to 231 MHz and expressing radio waves of different perceptions as colors,starIt fluidizes the dramatic process from its birth to its demise.
“Images of galaxies in this frequency range are unprecedented,” said Silvia Mantovanini, a postdoctoral researcher at Australia’s Curtin University.explain“It will provide valuable information about the evolution of stars, from their formation in different regions of the galaxy, to their interactions with other celestial bodies, to their final moments.”
Mantobaninilla’s research team used the Murchison Wide Field Interferometer (MWA) in Wadjari-Yamaji Country, Western Australia, to observe the southern hemisphere galactic plane of the Milky Way. By learning the results of 28 observations (GLEAM survey) and the results of 113 observations (GLEAM-X survey) conducted from 2018 to 2020, they were able to create an image that covers a vast area of approximately 3,800 square degrees.
This result represents a dramatic improvement over the previous image released in 2019, with twice the resolution, 10 times the sensitivity, and twice the coverage. The noise level has also been reduced to about 10 to 20 times that of conventional models.
Differences in color due to radio waves
Mantovanini’s research issupernova remnantThis is the cloud of gas and energy that is said to exist when a star explodes at the end of its life.
Thanks to the new images, researchers can now clearly separate the condensed material from forming stars from the gas left behind by dead stars.
In this image, the supernova remnant is represented as a large red circle.star forming regionThis difference in color reflects the frequency characteristics of the radio waves emitted by each celestial body.
In the HII region, where hydrogen gas is ionized, low-frequency radio waves are absorbed by the surrounding gas, resulting in a blue image. In contrast, supernova remnants appear red because their radio waves become stronger at lower frequencies.
In addition, this image ispulsarThis research may also provide new and surprising results. A neutron Pal star left behind after a supernova explosion is a celestial body that regularly emits electromagnetic pulses such as radio waves and X-rays from its magnetic pole as it rotates at high speed.