For over a century, scientists have been fascinated by powerful mysteries that pass through cosmic rays in the universe.
These high-energy particles penetrate through space at almost speed and bomb the Earth from deep in the Milky Way galaxy. But exactly where did they come from?
Now, groundbreaking research from astrophysicists at Michigan State University (MSU) brings us closer to the answer.
Two new research, led by Dr. Shuo Chang, an assistant professor in physics and astronomy, explores the elusive origins of cosmic rays and the extreme environments that create them.
The findings provide valuable insight into space accelerators that fire these particles across vast interstellar distances.
What are cosmic rays and why are they important?
Cosmic rays are primarily composed of protons and nuclei, some carrying millions of times greater energy than those achieved with human particle accelerators.
They come from some of the most energetic and violent astrophysical events in the universe, including black holes, supernova explosions, and star-forming regions.
However, cosmic rays are more than just deep space curiosity. They are closely related to life on Earth. Every second, about 100 trillion cosmic neutrinos (small ghostly particles associated with cosmic rays) pass through the body. These neutrinos provide clues to the powerful events that produced cosmic rays in the first place.
Uncovering the causes of cosmic rays not only answers long-standing questions in astrophysics, but also opens new doors to understanding galaxy evolution, dark matter behavior, and the life cycle of stars.
Case Crack: MSU investigates the Space Particle Accelerator
Dr. Zhang’s research focuses on the identification of Pevatrons. This is an astrophysical phenomenon, or 1 million evolts, which can accelerate particles to petalisectronvolt energy.
These space particle accelerators are rare and difficult to study, but Zhang’s team is making important progress.
In one of the newly published papers, Post-doctor researcher Stephen Dikerby analyzed data from the large-scale advanced air shower observatory (Lhaaso) that detected a potential Pevatron.
The team studied the objects using X-ray data from the XMM-Newton Space Telescope and discovered the Pulsar-wind nebula, a bubble of high-energy particles that was energized by rapidly rotating neutron stars.
This was one of the first times researchers confidently identified Pevatron as a specific type of cosmic ray source. This discovery brings scientists a step closer to understanding how these enigmatic accelerators work.
Students participate in exploring the galaxy
In the second study, three undergraduate students, Ella was Amiriwalker and Shaankarim.
Their analysis helped establish upper limits of X-ray emissions from these regions and laid the foundation for future research.
These findings are not only an advancement in cosmic ray science, but also an important opportunity for students to contribute to cutting-edge astrophysics.
What is next for the search for the origin of cosmic rays?
Zhang’s team will integrate data from the IceCube Neutrino Observatory with observations from X-ray and gamma-ray extensions.
One of the focuses is to understand why some cosmic ray sources emit neutrinos.
Their research continues to fill the fields of astronomy and particle physics with financial support from NASA and the National Science Foundation.
Cosmic rays: windows to extreme space
As MSU’s research shows, cosmic ray research is more than a theoretical exercise. These mystical particles can change our understanding of physics and the universe itself by carrying the secrets of some of the universe’s most extreme environments and revealing their origins.
Whether identifying the Pulsar Wind Nebula or collaborating across scientific disciplines, researchers approach the space question that has been lingering for over 100 years. Where do cosmic rays come from?
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