Image: Hubble peers at galactic cherry blossoms

Image: Hubble peers at galactic cherry blossoms
Credit: ESA (European Space Agency)

The galaxy NGC 1156 resembles a delicate cherry blossom tree flowering in springtime in this Hubble image. The many bright "blooms" within the galaxy are in fact stellar nurseries—regions where new stars are springing to life. Energetic light emitted by newborn stars in these regions streams outwards and encounters nearby pockets of hydrogen gas, causing the gas to glow with a characteristic pink hue.

NGC 1156 is located in the constellation of Aries (the Ram). It is classified as a dwarf irregular galaxy, meaning that it lacks a clear spiral or rounded shape, as other have, and is on the smaller side, albeit with a relatively large central that is more densely packed with .

Some pockets of gas within NGC 1156 rotate in the opposite direction to the rest of the galaxy, suggesting that there has been a close encounter with another galaxy in NGC 1156's past. The gravity of this other galaxy—and the turbulent chaos of such an interaction—could have scrambled the likely more orderly rotation of material within NGC 1156, producing the odd behavior we see today.


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Hubble captures elusive, irregular galaxy

Citation: Image: Hubble peers at galactic cherry blossoms (2019, July 15) retrieved 25 August 2019 from https://phys.org/news/2019-07-image-hubble-peers-galactic-cherry.html
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Jul 15, 2019
There are some very complicated issues of galaxy formation. Unfortunately, here is the same problem as with the stars. The origin of galaxies remains unclear, in spite of huge activity in the field. What the "formation" means? It means that we have the material that is assembling into galaxies.
https://www.acade...ome_From
https://www.acade...rvations

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