Crab Nebula: Noble gas molecules detected in space for the first time
Molecular ions of argon hydride were detected in supernova remnant
Monday 16 December 2013
Noble gas molecules have been detected in space for the first time ever, a team of astronomers has announced.
The detection was made in the Crab Nebula, the remnants of a star that exploded 1,000 years ago and is 6,500 light years away, using the SPIRE (Spectral and Photometric Imaging Receiver) on board the European Space Agency’s Herschel Space Observatory.
The noble gases (argon, helium, neon, xenon, radon and krypton) are chemically unreactive, and therefore do not easily combine with other elements. In the right circumstances, they can form molecules, although this had only ever been achieved on Earth in laboratory conditions.
However, noble gas molecules in the form of argon hydride ions have now been detected outside the laboratory, in space.
“Discovering argon hydride ions here was unexpected because you don’t expect an atom like argon, a noble gas, to form molecules, and you wouldn’t expect to find them in the harsh environment of a supernova remnant,” said Professor Mike Barlow from University College London who led the study.
Initially, Barlow’s team of astronomers was looking to examine how exploding stars create such huge amounts of dust. But when studying emission lines (the wavelengths emitted by molecules spinning in space), the team noticed some unexpected readings.
The light coming from some regions of the Crab Nebula was showing “extremely strong and unexplained” peaks in intensity, ranging from 618 GHz to 1235 GHz. Upon consulting the databases of known properties of molecules, the scientists concluded that these wavelengths could only be coming from spinning molecular ions of argon hydride. The team further concluded that only the argon-36 isotope could rotate at such a rate.
Scientists had previously hypothesised that the elements created by supernovas should include a lot of argon-36 and no argon-40, which was supported by the discovery.
Professor Matt Griffin from Cardiff University said: “Here we see the excellent performance of the Herschel-SPIRE spectrometer, the expertise of the instrument team in producing the highest quality data, and the tenacity and vision of the scientists analysing it, all coming together to make an intriguing new discovery.”
- 1 What happens to your body when you give up sugar?
- 2 Have sex with your iPad thanks to the new sex toy no-one asked for
- 3 The 'sex selfie stick' lets you FaceTime the inside of a vagina
- 4 Why you're almost certainly more like your father than your mother
- 5 Westboro Baptist Church couldn't picket Leonard Nimoy's funeral because they didn't know where it was
Durham Free School: 'Creationism taught at' free school facing closure
Nearly 100,000 of Britain's poorest children go hungry after parents' benefits are cut
End of the licence fee: BBC to back radical overhaul of how it is funded
Nigel Farage promises Ukip will not 'stigmatise' would-be migrants – and says he wants 'everyone to speak the same language'
Ex-head of MI6: 'We shouldn't kid ourselves that Russia is on a path to democracy'
Most people think legal tax avoidance is just as wrong as illegal tax evasion, poll suggests
£16000 - £18000 per annum: Recruitment Genius: They are an award-winning digit...
£45000 - £55000 per annum + benefits: Ashdown Group: Senior VMware Platform En...
£10000 - £16000 per annum: Recruitment Genius: A distributor of specialist ele...
£17000 - £19000 per annum: Recruitment Genius: A distributor of specialist ele...