August 10, 2022


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Fermi bubbles do not come from our galaxy?

Fermi bubbles do not come from our galaxy?

| Astronomy / Physics

In 2010, exciting news circulated all over the world of astronomy About the discovery of two giant bubbles above and below the center of the Milky Way. The structures recorded by the Fermi Gamma Ray Space Telescope, called Fermi bubbles, are 25,000 light-years high and likely only a few million years old. A group of American scientists has just published the results of a study showing that Bubbles come – at least in part – from outside our galaxy.

Spectroscopic observations of Fermi bubbles at radio, ultraviolet and optical wavelengths have allowed us to detect many gas clouds, possibly within the bubbles. In this work we refer to these clouds as high velocity clouds in Fermi bubbles (FB HVC). While it is possible to model the kinetics of these clouds using galactic winds flowing from the galactic center, the origin of the clouds is unknown until now we had little information about their mineral content.We read the pages natural astronomy.

The scientists showed, based on 12 FB HVC studies, that their mineral ranged from <20% to about 320% that of the solar mineral. This in turn calls into question the assumption that all FB HVCs come from the galactic center. We believe that FB HVCs come from both the disk and the halo of the Milky Way. And if so, some of these clouds may have properties of an intergalactic medium in which Fermi bubbles enter, drastically changing our knowledge of FB authors say. At this point, it should be remembered that astronomers call all elements heavier than helium metals. Thus, metallometry is defined as the concentration of elements other than hydrogen and helium relative to their concentration in the Sun.

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Therefore, scientists looked at the metallicity of gas clouds in Fermi bubbles. If their level is the same as that of the surrounding environment, then it can be concluded that the clouds consist of local matter. However, if the metallicity does not match the assumed source of the matter, it must be clarified where the clouds come from. Research shows that at least some of the matter in the Fermi bubbles comes from farther than the center of the Milky Way. Perhaps even from the galactic halo, the cloud of gases surrounding the galaxy. However, there are many possibilities, and we will have to wait many years for the final solution to this puzzle.

Fermi Bubbles Milky Way FB HVC