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  1. #1
    AppleCider's Avatar
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    swordsman doctor


    Dozen black holes found at galactic centre

    Source: BBC News



    A dozen black holes may lie at the centre of our galaxy, the Milky Way, researchers have said.

    A new analysis provides support for a decades-old prediction that "supermassive" black holes at the centres of galaxies are surrounded by many smaller ones.

    However, previous searches of the Milky Way's centre, where the nearest supermassive black hole is located, have found little evidence for this.

    Details appear in the journal Nature.

    Charles Hailey from Columbia University in New York and colleagues used archival data from Nasa's Chandra X-ray telescope to come to their conclusions.

    They report the discovery of a dozen inactive and low-mass "binary systems", in which a star orbits an unseen companion - the black hole.

    The supermassive black hole at the centre of the Milky Way, known as Sagittarius A* (Sgr A*), is surrounded by a halo of gas and dust that provides the perfect breeding ground for the birth of massive stars. These stars live, die and could turn into black holes there.

    In addition, black holes from outside the halo are believed to fall under the influence of Sgr A* as they lose their energy, causing them to be pulled into its vicinity, where they are held captive by its force.

    Some of these bind - or "mate" - to passing stars, forming binary systems.

    Previous attempts to detect this population of black holes have looked for the bright bursts of X-rays that are sometimes emitted by black hole binaries.

    Faint and steady

    "The galactic centre is so far away from Earth that those bursts are only strong and bright enough to see about once every 100 to 1,000 years," said Prof Hailey.

    Instead, the Columbia University astrophysicist and his colleagues decided to look for the fainter but steadier X-rays emitted when these binaries are in an inactive state.

    "Isolated, unmated black holes are just black - they don't do anything," said Prof Hailey.

    "But when black holes mate with a low mass star, the marriage emits X-ray bursts that are weaker, but consistent and detectable."

    A search for the X-ray signatures of low-mass black hole binaries in the Chandra data turned up 12 within three light-years of Sgr A*.

    By extrapolating from the properties and distribution of these binaries, the team estimates that there may be 300-500 low-mass binaries and 10,000 isolated low-mass black holes surrounding Sgr A*.

    Prof Hailey said the finding "confirms a major theory", adding: "It is going to significantly advance gravitational wave research because knowing the number of black holes in the centre of a typical galaxy can help in better predicting how many gravitational wave events may be associated with them."

    Gravitational waves are ripples in the fabric of space-time. They were predicted by Albert Einstein's general theory of relativity and detected by the Ligo experiment in 2015. One way these ripples arise is through the collision of separate black holes.

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  3. #2
    Overhaul's Avatar
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    assassin entertainer


    Awesome, so we're being pulled towards them?

    Might explain why there's a theory that the galaxy is shrinking.
    Think you know about powerscaling?
    Then come to the Tier List Thread and prove it!!




  4. #3
    Senior Member DemonFox's Avatar
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    swordsman doctor


    Quote Originally Posted by Overhaul View Post
    Awesome, so we're being pulled towards them?

    Might explain why there's a theory that the galaxy is shrinking.
    I don’t think the black holes has any effect on us since it’s light years away. You gotta be close to a black hole for it to start pulling you in.


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  5. #4
    Overhaul's Avatar
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    assassin entertainer


    Quote Originally Posted by DemonFox View Post
    I don’t think the black holes has any effect on us since it’s light years away. You gotta be close to a black hole for it to start pulling you in.
    Not immediate effect, sure. But they can be pulling celestial objects slowly. The theory of the universe shrinking exists, contrary to the expanding one. So that could possibly work in accordance, no?
    Think you know about powerscaling?
    Then come to the Tier List Thread and prove it!!




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