Tuesday , September 27 2022

A radio repeats the second burst from the depths of the Space space


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Lightning-like line, with a small peak in it, from a galaxy to telescopes on the floor, not on a scale

Artist concept of a fast radio of distant galaxy rage. Image via Danielle Futselaar.

Fast radio bursts (FRB) are one of the most disconcerting astrophysical discoveries in recent years. They are powerful but brief radio waves that seem to originate from galaxies to billions of light years away. Scientists still do not know what causes them, but they find more clues as they continue to investigate them. A curiosity has been that of more than 60 FRB found so far, only you have seen that it has been repeated from the same source so far.

Scientists from Canada detected a second repeat of FRB using the radiotelephone of the Canadian hydrogen intensity mapping experiment (CHIME) in the Okanagan valley, in British Columbia. He was informed by the University of McGill on January 9, 2019. The new discoveries were also published in two articles published by experts Nature January 9 and presented at the meeting of the American Astronomical Society in Seattle on the same day.

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The repetition of FRB is one of 13 observed by CHIME during a period of three weeks during the summer of 2018. Additional FRBs were found in the following weeks.

The detection of another repetitive FRB is exciting, as they appear to be relatively uncommon among FRBs in general. The first was observed by the Arecibo radio telescope in Puerto Rico in 2015. According to Ingrid Stairs, member of CHIME and astrophysicist at the University of British Columbia (UBC):

So far, there was only one well-known repetition of FRB. Knowing that there is another suggests there could be more. And with more repeaters and more sources available for study, we can understand these cosmic puzzles: where they are and what are the causes.

Structures of mesh of half cylinder with the open side pointing upwards

The CHIME Radial Telescope of Canada in the Okanagan Valley, in British Columbia. Image through CHIME.

CHIME detection was a bit surprising, most FRBs found before were at a frequency close to 1400 megahertz (MHz), while the telescope's observations were in the range of 400-800 MHz. But most of the first 13 new bursts were in fact lower than the frequency, up to the lowest frequencies that CHIME could detect. Scientists believe that additional FRBs can be found even lower more than the minimum of 400 MHz.

So what do the new results mean?

Whatever the cause of FRBs, it's something you have not seen before. Theories have gone from exotic phenomena involving neutron stars or black holes to foreigners yes. As Arun Naidu of McGill University pointed out:

Whatever the source of these radio waves, it is interesting to see the range of frequencies that can occur. There are some models where intrinsically the source can not produce anything below a certain frequency.

The first FRB, named FRB 121102, was discovered in 2007 by Duncan Lorimer and his student David Narkevic when they sought data from archive polls.

As Tom Landecker, member of the CHIME team of the National Research Council of Canada, added:

[We now know] The sources can produce low frequency radio waves and those low frequency waves can escape from their environment and are not very scattered to be detected when they reach Earth. This tells us something about environments and sources. We have not solved the problem, but there are several more pieces in the puzzle.

According to Kendrick Smith, a cosmologist at the Perimetral Institute of Theoretical Physics at Waterloo, Ontario:

The FRBs were an unexpected mystery. There are not so many qualitative mysteries in astrophysics. So explain that his nature has become one of the biggest unresolved problems in astrophysics in recent years.

CHIME is a unique radio telescope designed and built by Canadian astronomers, Smith explained:

CHIME reconstructs the image of the upper cell processing the radio signals recorded by thousands of antennas with a large signal processing system. The CHIME signal processing system is the largest of any terrestrial telescope, allowing you to search in large regions of the sky simultaneously.

Star field with insertion that shows the point of the FRB origin

The first FRB – baptized FRB 121102 – was discovered in 2007. This image of visible light shows its host galaxy. Image through the Gemini / AURA / NSF / NRC Observatory.

Most astronomers have a reasonable confidence that they will find a natural explanation, since FRBs have characteristics that make it difficult for a smart source. A problem, as Seth Shostak, a senior astronomer at the SETI Institute, explains, is that they seem to come from all over the sky, from galaxies separated by billions of light-years away.

But you can bet safely that aliens are not the cause of FRBs. Because? Arsenals are seen all over the sky, for that. The same type of signal comes from galaxies that are generally separated by billions of light years. So how could foreigners organize so much of the universe to emit the same type of signal? There has not been enough time since the Big Bang to coordinate a team work so widespread, even if you think of a reason for that!

It would be difficult to understand how foreigners could coordinate powerful radio explosions over such huge distances, but who knows? The Occam knife would suggest that FRBs are probably of natural origin, but that determine what is causing them will require continuous observations.

Basis: FRBs are an exotic phenomenon, regardless of what specifically causes them, and thanks to the new observations of telescopes such as CHIME, scientists are one step closer to the solution of this fascinating mystery.

Source: Observations of rapid bursts at frequencies up to 400 megahertz

Source: A second rapid burst of repeated radio

Via McGill University

Paul Scott Anderson

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