Some of the many thousands of merging galaxies identified within the GAMA survey.
Credit: Professor Simon Driver and Dr Aaron Robotham, ICRAR. Hi-res image
Credit: Professor Simon Driver and Dr Aaron Robotham, ICRAR. Hi-res image
In about five billion years time, nearby massive galaxy Andromeda will merge with our own galaxy, the Milky Way, in an act of gallactic cannibalism (technically Andromeda will be eating us, as it's the bigger of the two galaxies.). There haven't been any large mergers with our galaxy recently, but we can see the remnants of galaxies that have previously been snacked on by the Milky Way. We're also going to eat two nearby dwarf galaxies, the Large and Small Magellanic Clouds sometime in the future.
This simulation shows what will happen when the Milky Way and Andromeda get closer together and then collide, and then finally come together once more to merge into an even bigger galaxy.
Simulation Credit: Prof Chris power (ICRAR-UWA), Dr Alex Hobbs (ETH Zurich), Prof Justin Reid (University of Surrey), Dr Dave Cole (University of Central Lancashire) and the Theoretical Astrophysics Group at the University of Leicester.Video Production Credit: Pete Wheeler, ICRAR.
Credit: Joe Liske
Massive galaxies in the Universe have stopped making their own stars and are instead snacking on nearby galaxies, according to research by Australian scientists.
Astronomers looked at more than 22,000 galaxies and found that while
smaller galaxies were very efficient at creating stars from gas, the
most massive galaxies were much less efficient at star formation,
producing hardly any new stars themselves, and instead grew by eating
other galaxies.
The study was released today in the journal Monthly Notices of the
Royal Astronomical Society, published by Oxford University Press.
Dr Aaron Robotham based at The University of Western Australia node
of the International Centre for Radio Astronomy Research (ICRAR), said
smaller ‘dwarf’ galaxies were being eaten by their larger counterparts.
“All galaxies start off small and grow by collecting gas and quite efficiently turning it into stars,” he said.
“Then every now and then they get completely cannibalised by some much larger galaxy.”
Dr Robotham, who led the research, said our own Milky Way was at a
tipping point and expected to now grow mainly by eating smaller
galaxies, rather than by collecting gas.
“The Milky Way hasn’t merged with another large galaxy for a long
time but you can still see remnants of all the old galaxies we’ve
cannibalised,” he said.
“We’re also going to eat two nearby dwarf galaxies, the Large and
Small Magellanic Clouds, in about four billion years.”But Dr Robotham
said the Milky Way would eventually get its comeuppance when it merged
with the nearby Andromeda Galaxy in about five billion years.
“Technically, Andromeda will eat us because it’s the more massive one,” he said.
Almost all of the data for the research was collected with the
Anglo-Australian Telescope in New South Wales as part of the Galaxy And
Mass Assembly (GAMA) survey, led by Professor Simon Driver at ICRAR.
The GAMA survey involves more than 90 scientists and took seven years to complete.
This study is one of more than 60 publications to have come from the work, with another 180 in progress.
Dr Robotham said as galaxies grew they had more gravity and could therefore more easily pull in their neighbours.
He said the reason star formation slowed down in really massive
galaxies was thought to be because of extreme feedback events in a very
bright region at the centre of a galaxy known as an active galactic
nucleus.
“The topic is much debated, but a popular mechanism is where the
active galactic nucleus basically cooks the gas and prevents it from
cooling down to form stars,” Dr Robotham said.
Ultimately, gravity is expected to cause all the galaxies in bound
groups and clusters to merge into a few super-giant galaxies, although
we will have to wait many billions of years before that happens.
“If you waited a really, really, really long time that would
eventually happen but by really long I mean many times the age of the
Universe so far,” Dr Robotham said.
Further Information
ICRAR is a joint venture between Curtin University and The University of Western Australia with support and funding from the State Government of Western Australia.
Original publication details
‘Galaxy and Mass Assembly (GAMA): Galaxy close-pairs, mergers and the future fate of stellar mass’ in the Monthly Notices of the Royal Astronomical Society. Published online 19/9/2014 at: http://mnras.oxfordjournals.org/lookup/doi/10.1093/mnras/stu1604
Preprint version accessible at: http://arxiv.org/abs/1408.1476
Contacts
Dr Aaron Robotham
ICRAR – UWA (Currently travelling in South Africa, GMT +2:00)
E: aaron.robotham@icrar.org
Professor Simon Driver
Principal Investigator of the GAMA project. ICRAR – UWA (Perth, GMT +8:00)
Ph: +61 8 6488 7747 M: +61 400 713 514
E: simon.driver@icrar.org
Kirsten Gottschalk
Media Contact, ICRAR (Perth, GMT +8:00)
Ph: +61 8 6488 7771 M: +61 438 361 876
E: kirsten.gottschalk@icrar.org
UWA Media Office
Ph: +61 8 6488 7977
