Rapid radio Burst FRB 20220610A, the most powerful radio burst ever observed was detected on 10 June 2022. It had originated from a source that existed 8.5 billion years ago when the univers was just 5 billion years old which makes the source farthest known for an FRB. The source was thought to be either a single, irregular galaxie or a group of three distant galaxies. However, study of images captured by Hubble telescope on follow-up after its discovery reveals seven sources, one of which was identified as the host galaxie. The host galaxie was also determined to be a star-forming galaxie. The study identified the system as a compact galaxie group whose members showed signs of interaction among themselves. Galaxies in compact groups are uncommon, hence the finding of FRB 20220610A originating in such an environment presents a novel origin of FRBs.
Bursturile radio rapide (FRB), numite și Lorimer Bursts sunt fulgerări extrem de energice de unde radio. Sunt foarte scurte și durează câteva milisecunde. De la prima descoperire, în 2007, de către Duncan Lorimer, au fost detectate aproximativ 1000 de FRB.
The fast radio burst FRB 20220610A was detected on 10 June 2022. Four times more energetic than closer FRBs, it was the most powerful fast radio burst (FRB) ever observed. It had originated from its source that existed 8.5 billion years ago when the univers was only 5 billion years old. The FRB had travelled for 8.5 billion years to reach Hubble. The source was the farthest known so far for any FRB and thought to be either a single, irregular galaxie or a group of three distant galaxies.
However, sharp images captured by the Hubble telescope on follow-up after its discovery has revealed that the source of FRB 20220610A was not ‘one monolithic galaxie’. Usually, FRBs originate from isolated galaxies. Instead, this fast radio burst had originated from an interacting system of at least seven galaxies in proximity on the path of merging. This development broadens the list of possible sources of FRBs.
The origin and mechanism of formation FBR is not clearly understood. Nevertheless, it is agreed that highly compact bodies like neutron stea or gaură neagră are involved in generation of powerful radio blasts. Extreme physics phenomena such as collision of gaură neagră or neutron stea, starquakes when the crust of a neutron stea undergoes sudden adjustments, sudden snaping of tangled magnetic fields of most intensely magnetic type of neutron stars (a process akin to formation of solar flares but at much higher scale), periodic interaction of magnetospheres of a pair of orbitează neutron stele are some of possible mechanisms of formation of Fast radio bursts (FRBs).
Știința originii și mecanismul de formare a exploziilor radio rapide (FRB) este în mare parte incompletă, totuși, cel mai recent studiu completează o anumită lipsă de cunoștințe.
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Referinte:
- Echipa NASA Hubble Mission. Știri – Hubble găsește o casă ciudată a celei mai îndepărtate explozii radio rapide. Postat pe 09 ianuarie 2024. Disponibil la https://science.nasa.gov/missions/hubble/hubble-finds-weird-home-of-farthest-fast-radio-burst/
- Gordon AC, et al 2023. O explozie radio rapidă într-un grup Galaxy compact la z~1. Preprint arXiv:2311.10815v1. Trimis pe 17 noiembrie 2023. DOI: https://doi.org/10.48550/arXiv.2311.10815
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