A radio telescope inside Western Australia observed a ghostly cosmic phenomenon that closely resembled a jellyfish.
The diameter of a jellyfish may be more than one-third of the diameter of the moon, and the diameter of a jellyfish may come from the plasma of a supermassive black hole.
The lead researcher said that the Australian-Italian team used the Murchison Widefield Array (MWA) telescope to observe the galaxy cluster named Abell 2877 when they encountered a “ghost-like” formation.
Torrance Hodgson, International Center for Radio Astronomy (ICRAR) The Perth researchers explained that when the strange jellyfish-like structure appeared, the team observed the cluster for 12 hours at 57.5 MHz and five different radio frequencies from 87.5 to 215.5 MHz.
“We reported the discovery of a mysterious ultra-narrow-spectrum synchrotron (USS) source. The width of the source is about 370 kpc, which is peculiarly similar to a jellyfish with two emission peaks and long antennae. Descending toward the center of the cluster”, so it began to be published in Astrophysical Journal.
Hodgson explained: “We looked at the data and lowered the frequency, and saw ghostly jellyfish-like structures begin to appear.”
This video shows the formation of the USS jellyfish observed in the star cluster Abell 2877.
“The formation has extraordinary properties. Hodgson went on to say that under normal FM radio frequencies, it was very bright, but at 200 MHz, it actually disappeared. “There is no other similar extragalactic starlight that disappears so quickly. “
Interpreting this unusually steep spectrum has always been a challenge. Hodgson said: “We have to do some cosmic archaeology to understand the background of jellyfish.”
What is the explanation for the cosmic jellyfish?
‘Our theory is that about 2 billion years ago, a handful of supermassive black holes from multiple galaxies ejected powerful jets of plasma. This plasma disappeared, became silent, and remained static. Then, two things happened recently: while a very slight shock wave passed through the system, the plasma began to mix. This will temporarily rejuvenate the plasma and illuminate the jellyfish and their antennae so that we can see them.
From the earth, the diameter of jellyfish is more than one-third the diameter of the moon, but it can only be seen with low-frequency radio telescopes.
Hodgson said: “Most radio telescopes cannot obtain such low observations due to their design or location.”
MWA is the pioneer of the Square Kilometer Array (SKA), located at CSIRO’s Murchison Radio Astronomy Observatory in a remote area of Western Australia.
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