Three Galaxies in the Constellation Boötes
The three galaxies in the constellation Boötes are on a collision course and will eventually merge into a single substantial bright galaxy.
A stunning new image from the Hubble Space Telescope shows three galaxies heading for a collision and merger. While galactic collisions are relatively common, this one is rare because each of the galaxies is currently in the throes of birthing new stars.
The three galaxies in the constellation Boötes, will eventually merge to form a single giant galaxy. In the process, the spiral structure the galaxies exhibit will be wiped out due to gravitational interactions between the trio.
The image shows the three galaxies, collectively known as SDSSCGB 10189, close enough to appear to be merging. The shapes of the galaxies are already distorted, and strands of gas and dust can be seen linking them. The three galaxies emit a great deal of light.
As the collision unfolds, an unconnected spiral galaxy to the left sits serenely, almost like a cosmic equivalent of a passer-by “rubbernecking,” a more down-to-Earth crash on a highway here on our planet.
Within SDSSCGB 10189, the three large star-forming galaxies are just 50,000 light-years apart. While this may seem like a vast distance that doesn’t carry much danger of collision. In cosmic terms, it’s very close. For example, Andromeda, the nearest galaxy to our own Milky Way, is over 2.5 million light-years away from the sun.
Hubble Space Telescope
The new Hubble Space Telescope image is part of investigating the origins of the largest and most massive galaxies in the universe, which astronomers call Brightest Cluster Galaxies (BCGs).
BCGs form when a large galaxy swallows smaller or gas-rich galaxies like this trio collide and merge. Such cluster galaxies can be used to trace the formation of galactic clusters. Which are immense cosmic structures consisting of hundreds or even thousands of galaxies.
Scientists also hope that BCGs could provide hints about the evolution of the so-called “cosmic web.” The tangled structure of clumps and filaments of material formed by dark matter that connect individual galaxies within a cluster.
There is still a controversy surrounding BCGs. And at what time they formed in the 13.8 billion-year history of the universe. Some astronomers think these massive bright galaxies formed during an early epoch of the universe. When it was about 19% of its current age. Others believe BCGs are still developing and evolving today.
The merger of SDSSCGB 10189 could result in the birth of a BCG and thus could finally illuminate the mystery of how and when these massive bright galaxies form.
https://www.space.com/hubble-spots-three-galaxies-about-to-collide
