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العثور على حلقات شبحية حول ثقب أسود يبعد 7800 سنة ضوئية

Ghost rings found around a black hole 7800 light-years away

NASA has captured images of an “amazing” group of rings around a black hole resembling a stargate, 7800 light-years from Earth.

The black hole and its corresponding star system, known as V404 Cygni, were imaged by NASA’s Chandra X-ray Observatory and Neil Gehrells Swift Observatory.

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The black hole is pulling material away from the star in the system, which is about half the mass of the Sun, an event that created the rings visible only in X-rays.

“The rings tell astronomers not only about the behavior of the black hole, but also about the landscape between V404 Cygni and Earth,” researchers at the Chandra X-ray Observatory wrote in a statement.

For example, the diameter of the rings in X-rays reveals the distances of intervening dust clouds that emit light. If the cloud is closer to the ground, the ring appears larger and vice versa.

The light echoes appear as narrow rings rather than broad rings or halos because the X-ray burst lasted only for a relatively short period of time.

The rings are created by echoes of light, similar to what happens on Earth when sound waves bounce off solid surfaces.

“Instead of sound waves bouncing off the valley wall, a light echo was produced around V404 Cygni when a wave of X-rays from the black hole system bounced off dust clouds between V404 Cygni and Earth,” the statement added.

Cosmic dust is not like terrestrial dust, but more like smoke and consists of small solid particles.

The statement indicated that the rings are useful for scientists in understanding the black hole in more detail, as well as the distance between V404 Cygni and Earth.

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For example, the diameter of the rings in X-rays reveals the distances of intervening dust clouds that emit light. If the cloud is closer to the ground, the ring appears larger and vice versa.

read more

Proving Einstein's general theory of relativity after seeing light from behind a black hole for the first time!

Light echoes appear as narrow rings rather than broad rings or halos because the X-ray burst lasted only for a relatively short period of time.

The X-ray burst from the star system was first detected in June 2015, but the images were only recently released.

The composite image is a combination of X-rays seen by Chandra and data from the Pan-STARRS telescope in Hawaii that shows stars in the field of view.

The Chandra observatory observed the system between July 11 and 25, 2015, while the Swift Observatory made 50 observations of it between June 30 and August 25, 2015.

The Swift Observatory was launched into space 17 years ago, and the Chandra X-ray Observatory was launched into space on July 23, 1999.

Source: Daily Mail