Fast Radio Burst detected in ancient 'Dead' galaxy

For decades, astronomers have been fascinated with rapid radio bursts (FRBs), which are dazzling, millisecond-long energy explosions that release more energy than the sun does in a year. First seen in 2007, these cosmic whistles are usually from distant galaxies and remain one of the biggest mysteries of the universe. A new discovery, however, challenged the conventional wisdom of their evolutionary background.

The FRB 20240209A was discovered in February 2024 by a group of scientists as part of the Canadian Hydrogen Intensity Mapping Experiment (CHIME). In the following months, the space breakout imploded 21 times, providing astrophysicists with an opportunity to trace its origin and a focus within 11.3 billion years ago time of a very old galaxy. This galaxy, at a distance of 2 billion light-years, has long stopped making stars, and therefore it is a surprising candidate for such an energetic event.

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Historically, however, FRBs were assumed to be linked to magnetars neutron stars with extreme magnetic fields. Magnetars are well known for their ability to "explode" with very powerful bursts of energy and they may be the most probable option among the contenders as to the source of FRBs. However, the magnetar intrinsically associated with this burst appears to have survived in a Galactic environment now considered to be far from any conditions under which such outbursts could be maintained.

The explosion can be clearly traced to a globular cluster—a small group of old stars bound by gravity—located about 130,000 light-years away from their host galaxy's core. This is the second detection of an FRB at this particular location, and hence a big step towards understanding what these cosmic signals are.

This finding implies that FRBs may originate from evolved systems,instead of young, active galaxies, according to Tarraneh Eftekhari, senior author of one of the studies.

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FAQs:

1. What makes fast radio bursts (FRBs) so unique?
Fast radio bursts are millisecond-long bursts of intense brightness that, over the course of a year, are more luminous than the Sun. They are among the most mysterious phenomena seen in the universe and are alien in origin.


2. Why is the discovery of FRB 20240209A significant?
FRB 20240209A was discovered around an extinct galaxy that does not produce more stars, while the hypothesis of FRBs being created only from active sites of star formation was opposed. This finding suggests that these bursts can be generated in an aging manner, that is, in globular clusters, and thus expands our view on the kind of environments capable of producing such structures.