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Galactic collision creates a “space triangle” in a new Hubble image

A spectacular head-on collision between the two galaxies fueled the frenzy of the birth of an anomalous triangular star, as captured in a new image from NASA’s Hubble Space Telescope. Interacting galaxy duo are collectively called Arp143. The pair contains the glittering and distorted star-forming spiral galaxy NGC 2445 on the right and the less flashy companion NGC 2444 on the left. Credits: NASA, ESA, STScI, Julianne Dalcanton (Computational Astrophysics Center / Flatiron Institute and University of Washington)

A spectacular head-on collision between the two galaxies fueled the frenzy of the birth of an anomalous triangular star, as captured in a new image from NASA’s Hubble Space Telescope.


Interacting galaxy duo are collectively called Arp143. The pair contains the glittering and distorted star-forming spiral galaxy NGC 2445 on the right and the less flashy companion NGC 2444 on the left.

Astronomers suggest that galaxies pass through each other, igniting a uniquely shaped star-forming fire storm at NGC 2445, and thousands of stars are exploding on the right side of the image. This galaxy is full of star births because it is rich in gas, the fuel that makes stars. However, as shown on the left side of the image, we have not yet escaped from the gravity clutch of our partner NGC2444. The pair is unfolding a tug of war in space, and NGC2444 seems to have won. The galaxy draws gas from NGC 2445, forming a strange triangle of newly created stars.

“According to simulations, a frontal collision between two galaxies is one way to create a new ring of stars,” said Julianne Dalcanton, an astronomer at the Center for Computational Astrophysics at the Flatiron Institute in New York and the University of Washington in Seattle. Says. “Therefore, star-forming rings are not uncommon. But the strange thing about this system is that it is a star-forming triangle. Part of the reason for its shape is that these galaxies are still very much. NGC2444 is still close to, holding other galaxies by gravity. NGC2444 is an invisible hot gas halo that helps pull the gas of NGC 2445 away from the nucleus. Therefore, they are not yet completely free from each other and the anomalous interactions are distorted. The ring to this triangle. “

The NGC 2444 also stalks a toffee-like gas strand from a partner and stalks a young blue star streamer that appears to form a bridge between the two galaxies.

Credits: NASA Goddard Space Flight Center

These streamers are one of the first to look like a wave of star formation that began in the suburbs of NGC 2445 and continued inward. Researchers estimate that Streamer Star was born about 50 to 100 million years ago. However, these infant stars are left behind as NGC2445 continues to slowly pull away from NGC2444.

One to two million year old stars are formed near the center of NGC 2445. Hubble’s sharpness reveals some individual stars. They are the brightest and largest in the galaxy. Most of the bright blue lumps are a collection of stars. The pink mass is a huge, young star cluster, still surrounded by dust and gas.

Most actions occur in NGC 2445, but that does not mean that the other half of the interacting pair escaped intact. Gravity turbulence stretched NGC2444 into a strange shape.The galaxy contains old ones Performer And there is no new star birth, as it lost its gas long before the encounter of this galaxy.

“This is a close example of the kind of interaction that happened long ago. It’s a great sandbox for understanding star formation and interactions. Galaxy“. Elena Sabbi of the Space Telescope Science Institute in Baltimore, Maryland said.


Image: Hubble captures a swirling galaxy trio


Quote: Galaxy Collision is a new hable image taken on February 22, 2022 from https: //phys.org/news/2022-02-galaxy-collision-space-triangle-hubble.html (February 22, 2022) Create a “Space Triangle” on the day)

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Galactic collision creates a “space triangle” in a new Hubble image

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