The Hubble Space Telescope observed the dance of two distant galaxies

Somewhere over 1 billion light-years away, two galaxies float in the darkness of space and appear to be colliding. But these golden spirals, which are named SDSS J115331 and LEDA 2073461, contrary to what is seen, do not interact with each other, and their companionship is only because they are both in the same line of sight of the Hubble telescope. It is considered a common thing in space. These gigantic structures are drawn along the dark matter highways towards the nodes of the galaxy cluster and their flow causes the formation of a common galactic center.

Somewhere over 1 billion light-years away, two galaxies float in the darkness of space and appear to be colliding. But these golden spirals, which are named SDSS J115331 and LEDA 2073461, contrary to what is seen, do not interact with each other, and their companionship is only because they are both in the same line of sight of the Hubble telescope. It is considered a common thing in space. These gigantic structures are drawn along the dark matter highways towards the nodes of the galaxy cluster and their flow causes the formation of a common galactic center.

It is thought that this process is one of the ways to grow the massive black holes at the center of the galaxies to billions. be equal to the mass of the sun. Because when galaxies merge, their central black holes also merge.

But the universe is very big and there are many phenomena in it, so scientists have to interpret two bodies that are apparently in the same place. be careful and check if they are really interacting with each other or if they are located at a great distance from each other.

Distance is one of the most important tools available to interpret the universe and even the size, mass and brightness of many objects. Cannot be calculated without accurate distance measurement. But in space, it can be difficult to determine the distances because it is not possible just by looking at an object, and you must also know the amount of light emitted by it.

In this context, some phenomena such as supernovae Ia, whose intrinsic brightness is known, are a useful tool to measure. For relatively close objects, the parallax method can be used, but beyond a certain distance, it becomes more difficult to determine the distance of individual objects, and scientists have to rely on other tools, such as the stretching of light due to the expansion of the universe.

BingMag.com The Hubble Space Telescope observed the dance of two distant galaxies

Using such a method and thanks to Hubble, we now know that the two distant galaxies SDSS J115331 and LEDA 2073461 are in a massive collision event. do not have Although there are other clues in this regard. For example, these two galaxies have a very regular structure, and if they were in a collision event, their shape would undergo many changes.

Even in the vicinity of the Milky Way, it is difficult to measure distances. Scientists have recently discovered that a source of gamma rays is further away than previously thought. In this case, the common shape and alignment of the radiation and its source helped scientists better estimate the distance. Although galaxy overlaps do not always help to better understand galaxy collisions and mergers, they can be used to better understand spiral galaxies. A more distant galaxy with a background light makes the interstellar dust of the foreground galaxy better visible. A subject that scientists have used to map the distribution of interstellar dust in multiple galaxies.

It is currently unclear whether the Hubble image from SDSS J115331 and LEDA 2073461 will also be used for this purpose. But it's a sight to behold.

Photo: Hubble view of galaxies SDSS J115331 and LEDA 2073461
Credit: ESA/Hubble & NASA, W. Keel

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