The James Webb Space Telescope, which began operations in July 2022, is already providing the world with stunning images of the universe. This includes new discoveries such as the most comprehensive profiles of “incredibly massive” galaxies and the atmospheres of exoplanets, but also those we have long observed, such as Jupiter and a variety of other galaxies. It also includes fresh insights about the celestial bodies that have been around. The latest discovery of super instruments falls into his second category, as it provided the most detailed look yet at the supernova remnant Cassiopeia A (Cas A). According to one astronomer, the data provided by the images are enough for him to study for a very long time.
When a star runs out of fuel, it collapses under its own gravity, causing a spectacular explosion known as a supernova. This is the case of Cas A, which exploded 340 years ago from Earth’s point of view. This relatively recent cosmic event makes it the youngest supernova remnant visible from Earth and has been the subject of much scrutiny over the years. It lies about 11,000 light-years from Earth in the constellation Cassiopeia in our sky. It is about 10 light years across.
“Cas A looks at the debris regions of exploded stars and performs things like stellar dissection to understand what types of stars existed beforehand and how they exploded. It represents the best opportunity for the ‘Webb’ program that captures these observations.
Cas A has been observed by astronomical instruments before, but Webb’s ability to image in the mid-infrared range, along with its giant mirror, not only gives a deeper look into space, but also a sharper picture of objects near Earth. provides the ability to render a wide range of images. This allows researchers to obtain a previously impossible level of detail about the wreckage. Gaining more insight into what happened in Cas A could greatly enhance our understanding of stellar processes, and even what led to our own formation. This is to release some of the elements in our bodies, such as calcium and iron, into interstellar space.
“By understanding the process by which stars explode, we can read our own origin story,” Milisavljevic said. “I plan to spend the rest of my career making sense of this dataset.”
In a new image of Cas A taken by Webb, infrared was converted to visible wavelengths to create a vividly colored image. One of the more striking details is the greenish-brown ring of light to the right of the supernova’s center. “We nicknamed it the Green Monster in honor of Boston’s Fenway Park,” Milisavljevic said. The shape and complexity are unexpected and difficult to understand. ”
Other newly discovered details include specks of orange and reddish light at the top and left of the image, which researchers say were emitted from the collapsed star’s core. It’s the result of areas where matter is crashing into surrounding gas and dust.
“We are still trying to figure out the sources of all these emissions,” said Ilse de Luz of the University of Ghent in Belgium, another collaborator on the program.
Source: NASA
