Monday, January 30, 2023

What are the two mysterious bubbles floating near the Earth?

Fermi bubbles were born after a powerful explosion at the center of a galaxy long before the supermassive black hole.

it was in 2010 when a group of astronomers were working with fermi gamma-ray space telescope Announced the discovery of two giant spots centered in the center of the Milky Way. Spots extend more than above and below the floor of the spot 25,000 light years. he called them fermi bubbles And its origin remains a mystery.

Fermi bubbles emit a large amount radiation high energy. Recently discovered IceCube network in Antarctica 10 neutrinos Very high energy coming from the bubble.

This leads some astrophysicists to think about the possibility that they are producing subatomic matter in the Fermi bubble. These are full of mysterious space presences cosmic rayswhich can only be detected by telescopes that detect high-energy gamma rays.

a galactic mystery

There are various theories regarding their origin regarding Fermi bubbles, but there is no certainty. the most extensive tells us that they were built after a Powerful explosion at the center of the Milky Way Long time ago supermassive black holeWhich started 2.6 million years ago.

started bursting Twin jets of high-energy particles In space close to the speed of light. This ignited the giant bubble and pushed nearby matter away through the galaxy, researchers said in a study published in the journal Nature Astronomy.

“Based on our estimate of the jet power needed to inflate the Fermi bubble, the galactic black hole had a very good appetite,” he explained. Karen Yang is an assistant professor at National Tsing Hua University in Taiwan.

“It consumed about 1,000 to 10,000 solar masses of material over a period of about 100,000 years, starting about 2.6 million years ago.”

outflow winds from black holes

Another explanation for the origin of Fermi bubbles has been given by Yutaka FujitaA scientist at Tokyo Metropolitan University, who ran numerical simulations to come up with the answer.

Fujita tells us about a series of rapid outflow from a black hole, which inject the necessary energy into the gas surrounding the center of the galaxy. The expert found that there is a high probability that the Fermi bubbles were created by strong outflow winds, which moves at a speed of 1,000 km per second for 10 million years. These winds are composed of streams of highly charged particles that travel at high speeds and spread through space.

These winds move outward to interact with halo gas around, which causes a reverse shock that increases the temperature. The Fermi bubbles correspond to volumes located inside this shock front.

Importantly, Fujita’s simulations also showed that an instantaneous explosion at the center could not reproduce the profile measured by telescopes, giving weight to a scenario based on steady winds generated by the central black hole.

These flows have been observed in other galaxies; This discovery suggests that similar winds may have operated in our galaxy until very recently.

The discovery is published in the Monthly Notices of the Royal Astronomical Society.

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Nation World News Desk
Nation World News Desk
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