Andromeda Galaxy Eating the Neighborhood

By Nancy Atkinson - September 3, 2009 at 8:44 AM UTC | Extragalactic
Andromeda-Galaxy.jpg

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From Earth, the

Andromeda Galaxy

looks like a calm, bright galaxy, and is visible with the naked eye in our night sky. But astronomers have discovered things aren't as tranquil as it seems over at M31. Andromeda is eating the neighbors.

The Andromeda Galaxy contains a trillion stars and lies only about 2.5 million light-years away, so it is a great object to observe and study. But recently astronomers observed wispy streams of stars on the outer fringes of Andromeda, and realized they were leftovers from a cannibalistic feeding frenzy of smaller galaxies it has absorbed.

"This is a startling visual demonstration of the truly vast scale of galaxies," said Dr. Mike Irwin from the University of Cambridge. "The survey has produced an unrivalled panorama of galaxy structure which reveals that galaxies are the result of an ongoing process of accretion and interaction with their neighbours."

The cannibalism continues and another victim lies in wait: M33 in the constellation of Triangulum, is destined for a future meal.

"Ultimately, these two galaxies may end up merging completely," Dr. Scott also from the University of Cambridge. "Ironically, galaxy formation and galaxy destruction seem to go hand in hand."

Astronomers from Cambridge were part of an international team that made a million light-year-wide survey of the Andromeda Galaxy and its surroundings using a powerful digital camera on the giant Canada-France-Hawaii telescope on Mauna Kea, Hawaii.

They discovered that many of these stars could not have formed within Andromeda itself because the density of gas so far from the galaxy's core would have been too low to allow formation to take place. Therefore, the team reason that they are almost certainly the remnants of other, smaller galaxies which have been absorbed by Andromeda - and that Andromeda itself is still in a state of expansion.

The team's paper argues that the larger-scale substructures identified on the galaxy's fringes are probably the "undigested" remains of previously accreted dwarf galaxies. In all likelihood, they originally belonged to dwarf galaxies or other, proto-galactic fragments.

Article in Nature

.

Source:

PhysOrg

Nancy Atkinson

Nancy Atkinson

Nancy Atkinson is a space journalist and author with a passion for telling the stories of people involved in space exploration and astronomy. She is currently retired from daily writing, but worked at Universe Today for 20 years as a writer and editor. She also contributed articles to The Planetary Society, Ad Astra (National Space Society), New Scientist and many other online outlets.

Her 2019 book, "Eight Years to the Moon: The History of the Apollo Missions,” shares the untold stories of engineers and scientists who worked behind the scenes to make the Apollo program so successful, despite the daunting odds against it. Her first book “Incredible Stories From Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos” (2016) tells the stories of 37 scientists and engineers that work on several current NASA robotic missions to explore the solar system and beyond.

Nancy is also a NASA/JPL Solar System Ambassador, and through this program, she has the opportunity to share her passion of space and astronomy with children and adults through presentations and programs. Nancy's personal website is nancyatkinson.com