Categories: Chandra

Twin Tails Tell a Crazy Tale of Star Formation

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Stars forming outside a galaxy? That’s what a new observation with the Chandra X-ray Observatory appears to show. “This system is really crazy because where we’re seeing the star formation is well away from any galaxy,” said Megan from Michgan State University. “Star formation happens primarily in the disks of galaxies. What we’re seeing here is very unexpected.”

The image shows two distinct long tails of gas that are more than 200,000 light years in length and extends well outside any galaxy. The gas tails are located in the southern hemisphere near a constellation called Triangulum Australe, in a giant cluster of galaxies called Abell 3627. It is associated with a galaxy known as ESO 137-001 which is about 219 million light years from our own Milky Way Galaxy.

While a similar type of gas tail are places where stars form, usually this happens within the confines of a galaxy.

“The double tail is very cool – that is, interesting – and ridiculously hard to explain,” said Donahue. “It could be two different sources of gas or something to do with magnetic fields. We just don’t know.”

This gas tail was originally spotted by astronomers three years ago using a multitude of telescopes, including NASA’s Chandra X-ray Observatory and the Southern Astrophysical Research telescope in Chile. The new observations show a second tail, and a fellow galaxy, ESO 137-002, that also has a tail of hot X-ray-emitting gas.

How these newly formed stars came to be in this particular place remains a mystery as well. Astronomers theorize this gas tail might have “pulled” star-making material from nearby gases, creating what some have called “orphan stars.”

“This system continues to surprise us as we get better observations of it,” Donahue said.

Donahue was part of an international team of astronomers who published a paper on the twin tails in Astrophysical Journal.

Paper: Spectacular X-Ray Tails and Intracluster Star Formation

source: MSU

Nancy Atkinson

Nancy has been with Universe Today since 2004, and has published over 6,000 articles on space exploration, astronomy, science and technology. She is the author of two books: "Eight Years to the Moon: the History of the Apollo Missions," (2019) which shares the stories of 60 engineers and scientists who worked behind the scenes to make landing on the Moon possible; and "Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos" (2016) tells the stories of those who work on NASA's robotic missions to explore the Solar System and beyond. Follow Nancy on Twitter at https://twitter.com/Nancy_A and and Instagram at and https://www.instagram.com/nancyatkinson_ut/

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