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V404 Cygni: Huge rings around a black hole 5nvklj





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V404 Cygni: Huge rings around a black hole

Dragon
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V404 Cygni: Huge rings around a black hole Empty V404 Cygni: Huge rings around a black hole

Post by Dragon Sun Aug 08, 2021 2:53 am

The black hole is part of a binary system called V404 Cygni, located about 7,800 light years away from Earth.

The black hole is actively pulling material away from a companion star—with about half the mass of the Sun—into a disk around the invisible object.

This material glows in X-rays, so astronomers refer to these systems as "X-ray binaries."


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Post by Dragon Sun Aug 08, 2021 2:55 am

V404 Cygni: Huge rings around a black hole V404-cygni-huge-rings
Credit: X-ray: NASA/CXC/U.Wisc-Madison/S. Heinz et al.; Optical/IR: Pan-STARRS

This image features a spectacular set of rings around a black hole, captured using NASA's Chandra X-ray Observatory and Neil Gehrels Swift Observatory.

The X-ray images of the giant rings reveal information about dust located in our galaxy, using a similar principle to the X-rays performed in doctor's offices and airports.


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Post by Dragon Sun Aug 08, 2021 2:57 am

V404 Cygni: Huge rings around a black hole V404-cygni-huge-rings-1
Credit: Univ. of Wisconsin-Madison/S.Heinz

This artist's illustration shows in detail how the ringed structure seen by Chandra and Swift is produced.

Each ring is caused by X-rays bouncing off of different dust clouds.

If the cloud is closer to us, the ring appears to be larger.

The result is a set of concentric rings with different apparent sizes depending on the distance of the intervening cloud from us.


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V404 Cygni: Huge rings around a black hole Empty Re: V404 Cygni: Huge rings around a black hole

Post by Dragon Sun Aug 08, 2021 2:58 am



A Quick Look at V404 Cygni

Astronomers have captured a spectacular set of X-ray rings.

These rings are light echoes, similar to echoes from sound here on Earth.

X-rays from a black hole have bounced off dust clouds to create the rings.

This black hole and its companion star are about 7,800 light years from Earth.


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