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Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ The rapid radio eruption is finally traced back to its source: the galaxy's outskirts 4 billion light-years

The rapid radio eruption is finally traced back to its source: the galaxy's outskirts 4 billion light-years



Fast radio bursts (FRB) are one of the most puzzling phenomena faced by astronomers today. Essentially, FRBs are short radios from distant astronomical sources, the cause of which remains unknown. In some cases, FRBs were found, which were repeated, but most were one-off events. And while repeated sources have been traced to their place of origin, no events have been localized so far.

So far. The use of the Australian square kilometer Pathfinder (ASKAP) and other radio telescopes from around the world, led by an Australian astronomy team, confirmed the distance to an intense radio burst that flashed for only a thousandth of a second. It consists of the first non-recurring FRB traced to its source, which in this case is a galaxy located at 4 billion light-years.

Since the first FRB was discovered in 2007 ("Lorimer Burst"), radio astronomers are eagerly awaiting a chance to observe more. To date, forty events (most of which are extracted from archive data) and a handful of traces back to their sources have been found. Still, astronomers still do not know what causes them, with theories ranging from fast rotating neutron stars and black holes to alien radio signals.

The discovery of the FRB is quite challenging, as most of them are only a millisecond, and tracking them to their source is even more difficult. In this case, the FRB (known as FRB 180924) is a single burst that disappears as suddenly as it may seem – unlike others that may blink several times for an extended period of time. The results are published in a recent study . The first impulse was noticed by ASKAP researchers in 2018 during a special search from the antennas of the 36 radio telescopes of the array. Researchers then used the minimum time differences to reach the signals to the various antennas in the array to locate the source of the impulse. From these differences they managed to determine the initial galaxy of the blast.

As Adam Deller, a researcher at the Swinburne Technological University and lead author of the study, explained:

"When we were able to get a FRB 180924 position that was good at 0.1 angular second, we knew you would tell us not only which object is the host galaxy, but also where the host galaxy has happened. We found that the FRB is located away from the galaxy's core, in the "galactic suburbs".

The team then attracted the help of researchers from the Gemini South telescope and the very large ESO telescope (VLT). in Chile and WM Observatory Keck in Hawaii to monitor the galaxy and determine its distance and other characteristics. The Gemini Telescope is particularly useful as it has been designed with these observations.

Southern Gemini telescope in Chile. Yours sincerely: Gemini / AURA / Manuel Paredes Observatory

This is because the 8.1-meter Gemini South telescope is designed to deliver high-quality images and depths in optical and infrared wavelengths. However, the combined efforts of these three observatories and their advanced set of tools made it possible to locate the galaxy.

Nicola Teyos, a researcher from the Catholic University of Valparaiso in Chile, leads Gemini's observations. As explained in a Gemini Observatory statement: "The Middle South data absolutely confirmed that the light had left the galaxy about 4 billion years ago … ASCAP has given us a two-dimensional position in the sky, but the Twins, Keck and VLT observations, locked at a distance that ends the three-dimensional picture. "The knowledge of where this type of FRB is in the galaxy is important to astronomers, because it allows them to find some hint of what the birthplace might be. So far, most origins theories include a massive, compact object (ie a neutron star or a black hole), so knowing where the FRB is within a galaxy can tell astronomers whether this is formation, evolution, or crash / destruction of these objects,

This impression of the cosmic network artist, the filament structure that fills the entire universe, is illuminated by the FRB. Knowing where a FRB is found within a galaxy, astronomers also hope to be able to put limits on what can cause them. As Stuart Ryder, a researcher at Macquarie University and a research team member, said, FRB's research is on the cutting-edge field of astronomical research:

"It looks very much like gamma-bursts two decades ago, or more recent events of gravitational waves, we stand on the verge of an exciting new era in which we will learn where fast radio waves happen. In the end, our goal is to use FRBs as cosmology probes, the same way we use gamma rays, quasars and supernovae. "

Such a map, according to Ryder, can help resolve a continuing" barion problem that is lacking ". This refers to the difference between the observed amount of barium (subatomic building blocks of matter) in the universe and what theoretical models predict. Currently, standard models of cosmology predict that they are likely to be in the warm-hot intergalactic environment (WHIM), but all attempts to find them have been unsuccessful. But by determining where the FRB originates and how quickly their light has passed, astronomers could estimate the density of the material between the Earth and the radio sources. With a large enough sample, astronomers can also create a 3D map of the cross section at the point where the barion is located between galaxies and at what concentrations.

The four telescopes that make up the very large telescope of ESO in the Paranal Observatory> Image: By ESO / HHHeyer / Wikimedia Commons

Thanks to the joint efforts of all participating researchers and observatories, FRB 180924 is the second FRB signal localized . However, the other signal (FRB 121102) is a repetitive signal that flashes more than 150 times. While both types of signals are relatively rare, single FRBs are much more common than repetitive ones. The discovery of FRB 180924 can therefore lead to significantly improved localization methods

The ability to locate FRBs, especially non-repeatable, will also go a long way towards determining their exact cause. As Evan Keane – Scientist from the SKA and holder of the Merac Prize for Observatory Astrophysics for his innovative FRB work – said in a press release:

"To harness the full potential of FRB as a cosmological probe, it is important to be able to locate them exactly, and ASKAP did just that for the first time. This is an incredible step for FRB science. The ultimate goal will be to go deeper into the red move and locate thousands of FRBs, this is where SKA will enter. "[AstrologyhasprobablywarmedinrecentyearsBetweentheexplosioninthediscoveriesoftheexoplanetsthefirstdetectionofgravitationalwavesthefirstimageofablackholeandnowthestudyoftheFRBthereishardlyafieldthatdoesnotexperiencearevolution!Onecanonlyimaginewhereeverythingwillgo

Do not forget to check out this video, which explains how FRB 180924 was discovered and localized, courtesy of the British Organization for Scientific and Industrial Research (CSIRO):

Read more: Gemini Observatory, SKA, Science


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