eROSITA X-ray telescope discovers a new hourglass-shaped structure in Milky Way

Fermi bubbles are two blobs of massive structures in gamma rays which were discovered by astromers over a dece ago. se cant be observed with a naked eye, however, y are incredibly bright in gamma-ray emissions, which is most lumius and energetic electromagnetic light. It was se gamma rays that h led to ir discovery.

se massive outflows span over half of visible sky. One blob extends 25,000 light-years above Milky Way's disk, while or can be found just under it. However, se blobs have long remained a mystery for our galaxy.

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Researchers find massive hourglass-shaped structure similar to Fermi bubbles

Researchers have w found a huge hourglass-shaped structure as part of an all-sky survey that was undertaken using an eROSITA X-ray telescope. se have been called "eROSITA bubbles" and y are found to be quite similar to Fermi bubbles.

Here is a schematic view of Fermi bubbles (indicated in purple) and eROSITA (indicated in yellow). im shows difference in size between two bubbles.

Im credits: MPE

se bubbles bear similarity to Fermi bubbles, however, y are t as large and also have less energy. Similar to Fermi blobs,  eROSITA bubbles extend approximately 14 kiloparsecs below and above Galactic centre.  eROSITA bubbles have sharp borders that have ability to detect n-riative and collisionless shocks, and y are only visible in X-ray emissions.

This is a false colour map which highlights X-ray bubbles in green and red colours.

Im credits: MPE/IKI

This is a false colour map which highlights extended emission at energies of 0.6-1.0 keV.

Im credits: MPE/IKI

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Considering that both Fermi and eROSITA bubbles come in a similar hourglass-shaped structure and midpoint, it is safe to believe that two could have some kind of a physical connection. It is also likely that both outflows have appeared from a shared eruption of galactic fireworks a long time ago. However, it is still t kwn as to what was real cause or source of bubbles, however, scientists believe that it could possibly have something to do with a huge outburst of energy from Galactic black hole.

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It is likely that black hole could have been active in past connecting it to AGN with fasting growing black holes observed in faraway galaxies, however, it is dormant right w. According to eROSITA Principal Investigator, Andrea Merloni, blemishes which are left by se massive outbursts take a considerable amount of time to heal in  haloes.

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Im credits: MPE/IKI