View of the gamma-ray sky. Credit score: NASA/DOE/Fermi LAT Collaboration
Researchers from The Australian Nationwide College (ANU) have discovered another clarification for a mysterious gamma-ray sign coming from the middle of the galaxy, which was lengthy claimed as a signature of darkish matter.
Gamma-rays are the type of electromagnetic radiation with the shortest wavelength and highest power.
Co-author of the examine Affiliate Professor Roland Crocker stated this specific gamma-ray sign — referred to as the Galactic Heart Extra — may very well come from a particular sort of rapidly-rotating neutron star, the super-dense stellar remnants of some stars far more large than our solar.
The Galactic Heart Extra is an sudden focus of gamma-rays rising from the middle of our galaxy that has lengthy puzzled astronomers.
“Our work doesn't throw any doubt on the existence of the sign, however presents one other potential supply,” Affiliate Professor Crocker stated.
“It's primarily based on millisecond pulsars — neutron stars that spin actually shortly — round 100 occasions a second.
“Scientists have beforehand detected gamma-ray emissions from particular person millisecond pulsars within the neighborhood of the photo voltaic system, so we all know these objects emit gamma-rays. Our mannequin demonstrates that the built-in emission from a complete inhabitants of such stars, round 100,000 in quantity, would produce a sign totally suitable with the Galactic Heart Extra.”
The invention might imply scientists should re-think the place they search for clues about darkish matter.
“The character of darkish matter is totally unknown, so any potential clues garner quite a lot of pleasure,” Affiliate Professor Crocker stated.
“However our outcomes level to a different vital supply of gamma-ray manufacturing.
“As an example, the gamma-ray sign from Andromeda, the subsequent closest giant galaxy to our personal could also be largely as a result of millisecond pulsars.”
ANU Masters pupil Anuj Gautam led the analysis, which additionally concerned scientists from The Australian Defence Pressure Academy, College of Canterbury, and College of Tokyo.
The analysis has been printed within the journal Nature Astronomy.
Reference: “Millisecond pulsars from accretion-induced collapse because the origin of the Galactic Centre gamma-ray extra sign” by Anuj Gautam, Roland M. Crocker, Lilia Ferrario, Ashley J. Ruiter, Harrison Ploeg, Chris Gordon and Oscar Macias, 28 April 2022, Nature Astronomy.
DOI: 10.1038/s41550-022-01658-3
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