(ORDO NEWS) — A team of researchers led by scientists from the United States found that the metal content in the material of the high-speed clouds of the Fermi bubbles does not match the metal content in the material of the center of the Milky Way, that is, at least part of the material of these clouds comes from another place.
Previous studies have shown that massive clouds of plasma protrude above and below the plane of the disk of the Galaxy. Both of these lobes, called the Fermi bubble, are spherical structures consisting of gas.
According to recent studies, within these bubbles one can distinguish clouds of gas, which are called high-velocity clouds (Fermi bubble’s high-velocity clouds, FB HVCs).
In the new study, the scientists note that so far only a few studies have been performed regarding the composition of FB HVC objects, and yet many in the astronomical community believed that such clouds are composed of the material of the stellar disk located at the base of the bubbles, or of the material ejected from the side of the black hole lying in the center of the Galaxy.
Therefore, in their study, a team led by Trisha Ashley from the Institute for Space Research using a space telescope, USA, decided to study the chemical composition of the matter of the FB HVC clouds.
The main goal of the study was to determine the ratios between the metals in the matter of the clouds – if such ratios corresponded to other material located in the vicinity, then this would testify in favor of the hypotheses of the local origin of the material. If no match is found, then new hypotheses will be required to explain the origin of the material.
After analyzing both new and archival observational data collected with several different telescopes as part of the study of these high-speed clouds, the researchers found that in many cases there was no match, and therefore, at least some of the material was not of local origin and entered these clouds. from distant places – perhaps even from the halo of the Galaxy, which is a cloud of gases that surrounds the Milky Way.
The researchers believe that the presence of a large number of variants of the origin of this material requires a deeper study of it.
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