Sat Sep 28 03:04:56 UTC 2024: ## Indian Researchers Discover Tiny Black Hole Interacting With Surrounding Gas in Dwarf Galaxy

**Bengaluru, India – September 28, 2024** – A team of researchers from the Indian Institute of Astrophysics (IIA) has made a groundbreaking discovery, challenging established scientific beliefs about black holes. For the first time, they have observed the interaction between a radio jet emanating from an Active Galactic Nuclei (AGN) and the surrounding interstellar medium in a dwarf galaxy. This discovery was made in NGC 4395, located approximately 14 million light years away.

Radio jets are powerful streams of material ejected from the center of some galaxies, traveling at near light speeds and emitting strong radio waves. The prevailing hypothesis suggested that only large, massive galaxy jets regulate star formation and host AGNs powered by massive black holes. However, this discovery in a dwarf galaxy, with its comparatively smaller black hole, upends this understanding.

The IIA researchers meticulously analyzed data from various telescopes across the electromagnetic spectrum, including Chandra for X-ray data, Gemini-North and Hubble Space Telescope for optical data, and the Very Large Array for radio observations. This multi-wavelength analysis revealed a unique bipolar jet structure, centered on the black hole, within a region spanning just 30 light years.

Lead researcher Payel Nandi, a PhD student at IIA, stated, “We investigated how the radio jet from a small black hole interacts with the gas in the dwarf galaxy NGC 4395.” Co-author C. S. Stalin added, “This jet, while relatively weak, is interacting with the surrounding gas and likely causing shock waves to propagate through it.”

This discovery is significant because it reveals the existence of jet-ISM interaction at exceptionally small spatial scales, a phenomenon previously unknown. The findings challenge established notions about black holes and their impact on their galactic environments, further demonstrating the complexity and ongoing discoveries in the field of astrophysics.

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