Γρήγορα Ραδιόφωνο 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 σύμπαν 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 γαλαξίας 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 γαλαξίας. The host γαλαξίας was also determined to be a star-forming γαλαξίας. The study identified the system as a compact γαλαξίας 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.
Οι γρήγορες ραδιοφωνικές εκρήξεις (FRB), που ονομάζονται και Lorimer Bursts είναι εξαιρετικά ενεργητικές λάμψεις ραδιοκυμάτων. Διαρκούν πολύ σύντομα για λίγα χιλιοστά του δευτερολέπτου. Από την πρώτη ανακάλυψή του το 2007 από τον Duncan Lorimer, έχουν ανιχνευθεί περίπου 1000 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 σύμπαν 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 γαλαξίας 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 γαλαξίας’. 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 αστέρι or μαύρη τρύπα are involved in generation of powerful radio blasts. Extreme physics phenomena such as collision of μαύρη τρύπα or neutron αστέρι, starquakes when the crust of a neutron αστέρι 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 σε τροχιά νετρόνιο αστέρια are some of possible mechanisms of formation of Fast radio bursts (FRBs).
Η επιστήμη προέλευσης και ο μηχανισμός σχηματισμού γρήγορων ραδιοεκρήξεων (FRB) είναι σε μεγάλο βαθμό ελλιπείς, ωστόσο η τελευταία μελέτη καλύπτει κάποιο κενό γνώσης.
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αναφορές:
- Η ομάδα της αποστολής Hubble της NASA. Ειδήσεις – Το Hubble βρίσκει το περίεργο σπίτι της πιο μακρινής γρήγορης ραδιοφωνικής έκρηξης. Δημοσιεύτηκε στις 09 Ιανουαρίου 2024. Διαθέσιμο στο https://science.nasa.gov/missions/hubble/hubble-finds-weird-home-of-farthest-fast-radio-burst/
- Gordon AC, et αϊ 2023. Μια γρήγορη ριπή ραδιοφώνου σε μια συμπαγή ομάδα γαλαξιών στο z~1. Προεκτύπωση arXiv:2311.10815v1. Υποβλήθηκε στις 17 Νοεμβρίου 2023. DOI: https://doi.org/10.48550/arXiv.2311.10815
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