Context:
A high-resolution radio study using the e-MERLIN radio array has revealed weakly active supermassive black holes in nearby galaxies. The study shows that faint black hole activity may be common in the present-day Universe.
Explanation:
- Most galaxies are believed to contain a supermassive black hole at their centre, but many remain faint and difficult to detect.
- A black hole becomes active when it accretes gas and dust, releasing energy through radiation, jets and outflows.
- Such active centres are called Active Galactic Nuclei (AGN) and can influence star formation and galaxy evolution.
- Radio astronomy detects radio waves from compact sources, jets and outflows associated with black hole activity.
- e-MERLIN is a network of radio telescopes in the United Kingdom that works as an interferometer to produce high-resolution images.
- Chandra X-ray Observatory data helped confirm that the emissions came from black hole activity, not from star formation or supernova remnants.
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