description W44 Overview
W44 is a mixed-morphology supernova remnant located in the constellation Aquila, estimated to be roughly 20,000 years old. It is characterized by a combination of a radio shell and thermal X-ray emission contained within its boundaries. The remnant is physically associated with the pulsar PSR B1853+01, a highly magnetized, rotating neutron star left over from the original supernova explosion. Astronomers frequently study W44 to understand the interactions between supernova shock waves and the surrounding interstellar medium.
help W44 FAQ
What kind of supernova remnant is W44?
W44 is classified as a mixed-morphology remnant, with a radio-bright shell and centrally concentrated thermal X-ray emission. It lies in the constellation Aquila within a complex region of the Milky Way.
Is pulsar PSR B1853+01 connected to W44?
Yes, PSR B1853+01 is associated with the remnant and is understood as the compact stellar remnant of the explosion. Observations also show a pulsar-wind structure produced by its energetic particles.
How old is the W44 supernova remnant?
Astronomical estimates place W44's age at roughly 20,000 years. It is therefore an evolved remnant whose expanding shock has had time to interact strongly with nearby interstellar material.
Why is W44 important to gamma-ray astronomy?
W44 emits gamma rays where its shock encounters dense molecular clouds. Data from observatories including NASA's Fermi Gamma-ray Space Telescope have made it an important case for studying cosmic-ray acceleration.
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