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Tidal debris detected in nearby galaxy clusters



Tidal debris detected in nearby galaxy clusters

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Using the MeerKAT telescope, an international team of astronomers has identified a vast spectrum of debris in a nearby galaxy known as NGC 7232. The newly discovered structure consists of a super-cold, neutral hydrogen atom that extends its lifespan to more than 450,000 light years. These findings were reported in an article published May 21

at arXiv.org.

The study revealed that the signatures of galactic interactions can be seen in the form of the length and shape of tidal tails, bridges and other debris. When two galaxies orbit each other Tidal forces distort individual galaxies. These distorted regions are then ejected into intergalactic space. forming a wave tail

Studying such features could be crucial to improving our understanding of how galaxies interact with each other. Their observations have the potential even to reveal important information about galaxy collisions and mergers.

At a distance of about 78 million light-years, NGC 7232 is a nearby cluster of galaxies thought to consist of at least 19 galaxies. Like gas and non-gas galaxies, this makes NGC 7232 an excellent target for observations aimed at investigating how such interactions might influence galaxy evolution.

So, a team of astronomers led by Brenda Namumba from Rhodes University in Makhanda, South Africa. The MeerKAT radio telescope was used to look for signs of wave debris in this galaxy.

“We observed a nearby cluster of galaxies NGC 7232 at 1.4 GHz with MeerKAT using 4k mode (44 km/s) at similar velocity resolutions. MeerKAT’s sensitivity allows us to reach low rms. 5 times more than the published ASKAP data, the researchers wrote.

The observations detected an excess of ultra-cold neutral hydrogen atoms (HI) around the main twin galaxies in NGC 7232, also known as NGC 7232/3 (comprising three spiral galaxies: NGC 7232, NGC 7232B and NGC. 7233) The newly discovered tide extends for more than 20 arc minutes, or approximately 456,000 light-years, which is about three times the level of neutral hydrogen atoms as the triplets galaxies.

The HI fraction has a mass of 4.5 billion solar hydrogen atoms. This is more than half the total HI mass of the triplets galaxies. The authors of the report stated that The discovery provides new insights into where gas lies within the core of the triplets. and showing how galactic interactions played a key role in the evolution of galaxies in NGC 7232.

The study also found that within NGC 7232/3, NGC 7233, and NGC 7232, many hydrogen atoms were lost, while NGC 7232B appeared to have too much of this gas. The tripartite galaxy NGC 7232/3 is not without HI.

In their conclusion, the astronomers emphasized that their observations looked promising as they continued to study star formation and the distribution of hydrogen atoms in galaxies.

“Based on the success of our MeerKAT-64 observations, we look forward to a much larger project mapping star formation and HI gas distribution within nearby galaxy clusters. to assess the evolutionary state and formation history,” the researchers write.


Tidal tails detected around dwarf galaxy DDO 44


More information:
MeerKAT-64 has discovered a broad spectrum of debris in the nearby galaxy NGC 7232. arXiv:2105.10428 [astro-ph.GA] arxiv.org/abs/2105.10428

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reference: Debris found in a nearby galaxy group (2021, May 31). Retrieved 31 May 2021 from https://phys.org/news/2021-05-tidal-. debris-nearby-galaxy-group.html

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