{"id":14128,"date":"2022-06-08T17:02:55","date_gmt":"2022-06-08T15:02:55","guid":{"rendered":"https:\/\/www.sciencefocus.com\/?p=121271"},"modified":"2022-06-08T17:40:28","modified_gmt":"2022-06-08T15:40:28","slug":"fast-radio-bursts-just-keep-getting-weirder","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/rss_feed\/fast-radio-bursts-just-keep-getting-weirder\/","title":{"rendered":"Fast radio bursts just keep getting weirder"},"content":{"rendered":"

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By Russell Deeks\n \t\t<\/p>

Published: Wednesday, 08 June 2022 at 12:00 am<\/p>

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Astronomers from The National Radio Astronomy Observatory in the US have found that a fast radio burst (FRB), FRB190520, that was first discovered in 2019 shares an odd characteristic with just one other FRB of the 500-plus that have so far been discovered. It\u2019s hoped their findings may help shed new light on the origins of these mysterious cosmic phenomena.<\/p>\n

Fast radio bursts are exactly what the name implies \u2013 an intense but short-lived burst of energy in the radio spectrum. Exactly how intense and short-lived are we talking here? Try emitting as much energy in a couple of milliseconds as the Sun does in three days on for size!<\/p>\n

FRBs are a relatively new area of study \u2013 the first was only discovered in 2007, lurking in radio telescope data that had been gathered in 2001, and scientists had never actually observed one taking place \u2018live\u2019 (or rather, seen the resulting afterglow) until a team at Australia\u2019s Parkes Observatory did just that in 2015. As such, there is still much about them that is unknown \u2013 not least what actually causes them.<\/p>\n

Various points of origin have been mooted for FRBs, including neutron stars, gamma ray bursts, black holes<\/a>, star collisions and magnetars, a subset of neutron stars that are magnetically ultra-charged, but scientists have yet to pin down a precise cause.<\/p>\n

It may even be that more than one type of cosmological object or event can cause the phenomenon \u2013 not least because while most FRBs appear to be one-off events, some repeat in a regular, predictable cycle. Which is where FRB190520 comes in.<\/p>\n

Like most bursts, FRB190520 was discovered by trawling through archived telescope data \u2013 the burst occurred on 19 May 2019, but wasn\u2019t \u2018seen\u2019 until November that year. But astronomers soon realised that this was one of the rarer \u2018repeater\u2019 class; what has only more recently been discovered is that, in-between those regular high-energy bursts, whatever is causing FRB190520 is also the source of constant, much lower-energy radio emissions<\/a>, a characteristic it shares only with FRB121102.<\/p>\n

The scientists now hope that by studying the differences between these two FRBs and all the others, they may be able learn more about the phenomenon\u2019s origins.<\/p>\n

\u201cThe FRB field is moving very fast right now and new discoveries are coming out monthly. However, big questions still remain, and this object is giving us challenging clues about those questions,\u201d said Sarah Burke-Spolaor, of WVU<\/a>.<\/p>\n