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 A daily walk 'can add seven years to your life'
- 2 Rules on 5p plastic bags likely to lead to arguments at the check-out
- 3 Chrissie Hynde says women who 'wear high heels and dress provocatively entice rapists'
- 4 Blood Moon and Supermoon: September to bring brightest – and dimmest – full Moon of the year on same night
- 5 News agency criticised for describing Amal Clooney as 'actor's wife' in coverage of human rights trial
University to mark down students who say 'illegal immigrants' in class
Rules on 5p plastic bags likely to lead to arguments at the check-out
The nine most warmongering countries in the world revealed
Blood Moon and Supermoon: September to bring brightest – and dimmest – full Moon of the year on same night
VMAs 2015: Kanye West to run for US president, Nicki Minaj calls out Miley Cyrus and the rest of tonight's winners
Climate change: 2015 will be the hottest year on record 'by a mile', experts say
'Women only' train carriages: Jeremy Corbyn unveils radical move to tackle public harassment
Black holes are a passage to another universe, says Stephen Hawking
Tony Blair attacks Jeremy Corbyn's 'Alice In Wonderland' politics
Theresa May says migrants should be banned from entering the UK unless they have jobs lined up
Iain Duncan Smith 'should resign over disability benefit death figures', says Jeremy Corbyn
£28000 - £37000 per annum: Recruitment Genius: This is an opportunity to join ...
£22000 - £29000 per annum: Recruitment Genius: This company's mission is to ma...
£13832 per annum: Recruitment Genius: This 5 star leisure destination on the w...
£20000 - £32000 per annum: Recruitment Genius: A Sales Account Manager is requ...