Crab Nebula: Noble gas molecules detected in space for the first time

Molecular ions of argon hydride were detected in supernova remnant

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.” 

Start your day with The Independent, sign up for daily news emails
ebooks
ebooksAn introduction to the ground rules of British democracy
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
SPONSORED FEATURES
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Recruitment Genius: Travel Customer Service and Experience Manager

£14000 - £17000 per annum: Recruitment Genius: The fastest growing travel comp...

Recruitment Genius: Cleaner / Caretaker / Storeman

£15500 - £17680 per annum: Recruitment Genius: A position has become available...

Recruitment Genius: Head of Sales - SaaS B2B

£60000 - £120000 per annum: Recruitment Genius: This conference call startup i...

Recruitment Genius: Web Developer

£25000 - £30000 per annum: Recruitment Genius: This digital and print design a...

Day In a Page

Blairites be warned, this could be the moment Labour turns into Syriza

Andrew Grice: Inside Westminster

Blairites be warned, this could be the moment Labour turns into Syriza
HMS Victory: The mystery of Britain's worst naval disaster is finally solved - 271 years later

The mystery of Britain's worst naval disaster is finally solved - 271 years later

Exclusive: David Keys reveals the research that finally explains why HMS Victory went down with the loss of 1,100 lives
Survivors of the Nagasaki atomic bomb attack: Japan must not abandon its post-war pacifism

'I saw people so injured you couldn't tell if they were dead or alive'

Nagasaki survivors on why Japan must not abandon its post-war pacifism
Jon Stewart: The voice of Democrats who felt Obama had failed to deliver on his 'Yes We Can' slogan, and the voter he tried hardest to keep onside

The voter Obama tried hardest to keep onside

Outgoing The Daily Show host, Jon Stewart, became the voice of Democrats who felt the President had failed to deliver on his ‘Yes We Can’ slogan. Tim Walker charts the ups and downs of their 10-year relationship on screen
RuPaul interview: The drag star on being inspired by Bowie, never fitting in, and saying the first thing that comes into your head

RuPaul interview

The drag star on being inspired by Bowie, never fitting in, and saying the first thing that comes into your head
Secrets of comedy couples: What's it like when both you and your partner are stand-ups?

Secrets of comedy couples

What's it like when both you and your partner are stand-ups?
Satya Nadella: As Windows 10 is launched can he return Microsoft to its former glory?

Satya Nadella: The man to clean up for Windows?

While Microsoft's founders spend their billions, the once-invincible tech company's new boss is trying to save it
The best swimwear for men: From trunks to shorts, make a splash this summer

The best swimwear for men

From trunks to shorts, make a splash this summer
Mark Hix recipes: Our chef tries his hand at a spot of summer foraging

Mark Hix goes summer foraging

 A dinner party doesn't have to mean a trip to the supermarket
Ashes 2015: With an audacious flourish, home hero Ian Bell ends all debate

With an audacious flourish, the home hero ends all debate

Ian Bell advances to Trent Bridge next week almost as undroppable as Alastair Cook and Joe Root, a cornerstone of England's new thinking, says Kevin Garside
Aaron Ramsey interview: Wales midfielder determined to be centre of attention for Arsenal this season

Aaron Ramsey interview

Wales midfielder determined to be centre of attention for Arsenal this season
Community Shield: Arsene Wenger needs to strike first blow in rivalry with Jose Mourinho

Community Shield gives Wenger chance to strike first blow in rivalry with Mourinho

As long as the Arsenal manager's run of games without a win over his Chelsea counterpart continues it will continue to dominate the narrative around the two men
The unlikely rise of AFC Bournemouth - and what it says about English life

Unlikely rise of AFC Bournemouth

Bournemouth’s elevation to football’s top tier is one of the most improbable of recent times. But it’s illustrative of deeper and wider changes in English life
A Very British Coup, part two: New novel in pipeline as Jeremy Corbyn's rise inspires sequel

A Very British Coup, part two

New novel in pipeline as Jeremy Corbyn's rise inspires sequel
Philae lander data show comets could have brought 'building blocks of life' to Earth

Philae lander data show comets could have brought 'building blocks of life' to Earth

Icy dust layer holds organic compounds similar to those found in living organisms