NASA, ESA – A supermassive Black Hole with an unexpected behavior has been discovered by the team of astronomers using the data samples taken from several NASA and European Space Agency (ESA) space observatories.

The supermassive black hole is at the heart of the galaxy NGC 5548, located 244.6 million light-years from Earth. This behavior may provide new insights into how supermassive black holes interact with their host galaxies.

Immediately after NASA’s Hubble Space Telescope observed NGC 5548 in June 2013, this international research team discovered unexpected features in the data. They detected a stream of gas flowing rapidly outward from the galaxy’s supermassive black hole, blocking 90 percent of its emitted X-rays.

“The data represented dramatic changes since the last observation with Hubble in 2011,” said Gerard Kriss of the Space Telescope Science Institute (STScI) in Baltimore, Maryland. “I saw signatures of much colder gas than was present before, indicating that the wind had cooled down due to a significant decrease in X-ray radiation from the galaxy’s nucleus.”

The discovery was made during an intensive observing campaign that also included data from NASA’s Swift spacecraft, Nuclear Spectroscopic Telescope Array (NuSTAR) and Chandra X-ray Observatory, as well as ESA’s X-ray Multi-Mirror Mission (XMM-Newton) and Integral gamma-ray observatory (INTEGRAL).

“There are other galaxies with similar streams of gas flowing outward from the direction of its central black hole, but we’ve never before found evidence that the stream of gas changed its position as dramatically as this one has,” said Kriss. “This is the first time we’ve seen a stream like this move into our line of sight. We got lucky.”

After combining and analyzing data from all six sources, the team was able to put together the pieces of the puzzle. Supermassive black holes in the nuclei of active galaxies, such as NGC 5548, expel large amounts of matter through powerful winds of ionized gas. For instance, the persistent wind of NGC 5548 reaches velocities exceeding 621 miles (approximately 1,000 kilometers) a second. But now a new wind has arisen, much stronger and faster than the persistent wind.

This behavior may provide new insights into how supermassive black holes interact with their host galaxies. Source: Nasa.

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