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 Unseen Charlie and the Chocolate Factory chapter deemed 'too subversive' released
- 3 Joan Rivers: 'Palestinians deserve to be dead'
- 4 A teacher speaks out: 'I'm effectively being forced out of a career that I wanted to love'
- 5 Mexican woman becomes world’s 'oldest person' at 127
Israel-Gaza crisis: YouTube footage shows scale of destruction after 50 days of shelling
Keira Knightley topless: Conservative actress does own take on #Freethenipple campaign for Interview Magazine
iPhone 6 'hidden code' could indicate bigger phones, sharper screens
Joan Rivers: 'Palestinians deserve to be dead'
Ebola virus: It's ripped through towns – now the deadliest ever outbreak of the virus is heading for Africa's teeming cities
Robin Williams Emmys tribute led by Billy Crystal criticised for including 'racist' joke about Muslim woman
Rotherham child sex abuse scandal: Labour Home Office to be probed over what Tony Blair's government knew - and when
The Rotherham child abuse scandal is a tale of apologists, misogyny and double standards
What do immigrants really think of Britain? Polish immigrant's Reddit post goes viral
Do you realise just how foolish the UK looks?
With Douglas Carswell joining Ukip, my party has taken another giant step forward
- < Previous
- Next >
Negotiable: Randstad Education Plymouth: Randstad Education Ltd are seeking EY...
Negotiable: Randstad Education Plymouth: NEWLY QUALIFIED TEACHER WE CAN HELP ...
£55000 - £65000 per annum + Benefits + Bonus: Harrington Starr: Lead FE Softwa...
Negotiable: Randstad Education Plymouth: Year 4 Primary Teachers needed for Se...