Skip to footer

Galactic growth seen in far reaches of the universe

With Chile's ALMA telescope, astronomers have obtained "unprecedented" images of star formation in a distant galaxy.

|
Courtesy of ALMA (NRAO/ESO/NAOJ)/Y. Tamura (The University of Tokyo)/Mark Swinbank (Durham University)
ALMA’s Long Baseline Campaign has produced a spectacularly detailed image of a distant galaxy being gravitationally lensed, revealing star-forming regions — something that has never been seen before at this level of detail in a galaxy so remote.
  • By Nola Taylor Redd Space.com

The mysteries of star formation in a distant galaxy have been revealed in unprecedented detail, thanks to the twisting and bending of light by gravity.

By pairing the Atacama Large Millimeter/submillimeter Array (ALMA) telescope in Chile with a natural phenomenon known as gravitational lensing, scientists have probed the details of a galaxy 11.4 billion light-years away with remarkable precision and, in the process, have learned details about its structure, contents, motion and other physical characteristics. ALMA scientists also created a video of the so-called "Einstein ring's" magnifying effect,

"ALMA was designed to be the most powerful telescope of its kind, but by harnessing the magnifying power of this gravitational lens, we were able to study a distant and mysterious object in detail that would have been impossible otherwise," Todd Hunter, an astronomer at  the National Radio Astronomy Observatory (NRAO), said in a statement. [65 Amazing Galaxy Images] 

"This one data set has spawned an entire series of highly intriguing research, confirming that ALMA offers the astronomical community new avenues to probe the distant universe," said Hunter, who was a co-author of one of seven scientific papers detailing the distant galaxy.

Einstein ring

As part of his theory of general relativity, Albert Einstein theorized that massive objects would bend space and time. Any light that passes through the warped space-time would act as a cosmic magnifying glass — a gravitational lens, he said. When a massive object, such as a galaxy, lines up with a distant object, it creates a special type of gravitational lens known as an Einstein ring.

In the case of this particular galaxy, named HATLAS J090311.6+003906, also known as SDP.81, the Einstein ring allowed scientists to study the background galaxy in remarkable detail. Functioning at its highest resolution, ALMA revealed never-before-seen dusty clouds thought to be clumps of cold molecular gas where stars form.

The telescope also allowed astronomers to measure how the galaxy rotates and to estimate its mass. According to the new research, the gas in SDP.81 is unstable, with clumps collapsing inward. These clumps are likely to create giant new star-forming regions in the future, according to the same statement from the NRAO. The studies also suggest that a supermassive black hole with a mass 200 million to 300 million times that of the sun exists in the center of the foreground galaxy.

Because it takes a year for light to travel one light-year, looking across the vast distances of space is akin to looking back in time. That means scientists saw the galaxy as it appeared when the universe was only 15 percent of its current age — only 2.4 billion years after the Big Bang, according to the statement.

The European Southern Observatory's (ESO) ALMA telescope, which sits in the Atacama Desert in Chile, consists of 66 individual antennas that can be positioned differently to change the resolution of the entire instrument. For this study, the antennas were at their widest separation, up to 9.3 miles (15 kilometers) apart.

"The reconstructed ALMA image of the galaxy is spectacular," Rob Ivison, ESO's director of science and a co-author of two of the papers, said in the same statement. "We can study galaxies at the other end of the universe as they merge and create huge numbers of stars. This is the kind of stuff that gets me up in the morning!"

The research papers have been submitted to various journals, and four of the studies have been accepted for publication.

Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

Copyright 2015 SPACE.com, a Purch company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

[Editor's note: An earlier version misstated the distance of HATLAS J090311.6+003906 from Earth.]

You've read  of  free articles. Subscribe to continue.
Real news can be honest, hopeful, credible, constructive.
What is the Monitor difference? Tackling the tough headlines – with humanity. Listening to sources – with respect. Seeing the story that others are missing by reporting what so often gets overlooked: the values that connect us. That’s Monitor reporting – news that changes how you see the world.
editor@csmonitor.com
Subscribe
Mark Sappenfield
Editor

Dear Reader,

About a year ago, I happened upon this statement about the Monitor in the Harvard Business Review – under the charming heading of “do things that don’t interest you”:

“Many things that end up” being meaningful, writes social scientist Joseph Grenny, “have come from conference workshops, articles, or online videos that began as a chore and ended with an insight. My work in Kenya, for example, was heavily influenced by a Christian Science Monitor article I had forced myself to read 10 years earlier. Sometimes, we call things ‘boring’ simply because they lie outside the box we are currently in.”

If you were to come up with a punchline to a joke about the Monitor, that would probably be it. We’re seen as being global, fair, insightful, and perhaps a bit too earnest. We’re the bran muffin of journalism.

But you know what? We change lives. And I’m going to argue that we change lives precisely because we force open that too-small box that most human beings think they live in.

The Monitor is a peculiar little publication that’s hard for the world to figure out. We’re run by a church, but we’re not only for church members and we’re not about converting people. We’re known as being fair even as the world becomes as polarized as at any time since the newspaper’s founding in 1908.

We have a mission beyond circulation, we want to bridge divides. We’re about kicking down the door of thought everywhere and saying, “You are bigger and more capable than you realize. And we can prove it.”

If you’re looking for bran muffin journalism, you can subscribe to the Monitor for $15. You’ll get the Monitor Weekly magazine, the Monitor Daily email, and unlimited access to CSMonitor.com.

Subscribe to insightful journalism

QR Code to Galactic growth seen in far reaches of the universe
Read this article in
https://www.csmonitor.com/Science/2015/0610/Galactic-growth-seen-in-far-reaches-of-the-universe
QR Code to Subscription page
Start your subscription today
https://www.csmonitor.com/subscribe